diff --git a/packages/local-runtime-v2/test/integration/webui-owner-host.integration.test.ts b/packages/local-runtime-v2/test/integration/webui-owner-host.integration.test.ts
index 2bc36deb7..bb389fd08 100644
--- a/packages/local-runtime-v2/test/integration/webui-owner-host.integration.test.ts
+++ b/packages/local-runtime-v2/test/integration/webui-owner-host.integration.test.ts
@@ -96,7 +96,7 @@ describe('a host declared as webui', () => {
   );
 
   it(
-    'reports cron native and the channel bridge unsupported in its diagnostics',
+    'reports cron native and the channel bridge native in its diagnostics',
     async () => {
       const host = await bootWebuiHost();
       // Phase 2's correction, observed end to end: the surface table no longer claims
@@ -106,7 +106,11 @@ describe('a host declared as webui', () => {
         | Record<string, { status?: string }>
         | undefined;
       expect(surfaces?.cron?.status).toBe('native');
-      expect(surfaces?.channelBridge?.status).toBe('unsupported');
+      // The WebUI row of the owner policy assembles the channel service: the
+      // browser client's remote page carries the channel tab, so a browser
+      // owner has a screen to bind and manage a channel with. The surface
+      // table reports the bridge it assembled, which is a native one.
+      expect(surfaces?.channelBridge?.status).toBe('native');
     },
     120_000,
   );
diff --git a/packages/webui/docs/verification/coverage-review.md b/packages/webui/docs/verification/coverage-review.md
index c808a54fd..6713e1a8b 100644
--- a/packages/webui/docs/verification/coverage-review.md
+++ b/packages/webui/docs/verification/coverage-review.md
@@ -9,14 +9,14 @@ not claim. A number in this document is a number some gate produced.
 
 | Question | Count |
 | --- | --- |
-| Client UI modules classified | 131 |
+| Client UI modules classified | 133 |
 | Modules with a pending contract decision | 0 |
-| Floating layers inventoried | 22 |
-| Floating layers managed by the coordinator | 21 |
+| Floating layers inventoried | 23 |
+| Floating layers managed by the coordinator | 22 |
 | Business-authored alerts left (all exempt) | 2 |
-| Motion distinct effects with a recorded reason | 24 |
+| Motion distinct effects with a recorded reason | 25 |
 | Accessibility findings recorded as debt | 0 |
-| Accessibility exceptions | 26 |
+| Accessibility exceptions | 0 |
 | Accessibility manual reviews open | 0 |
 
 ## Every entry still pending, and why
@@ -56,11 +56,11 @@ Not verified by any browser check:
 - `features/account/ui/UserMenuUsage.tsx` — borrows the dialog role for labelling only: renders role=dialog for labelling only: it is a hover/focus fly-out inside the account menu's layer and is dismissed by that menu, not by itself. Owner: the account menu. Removal: when the fly-out becomes a layer of its own.
 ### The accessibility scan
 
-- 26 reviewed exceptions, each carrying rule, surface, state, target, reason, owner and removal condition in `accessibility-exceptions.json`.
+- 0 reviewed exceptions, each carrying rule, surface, state, target, reason, owner and removal condition in `accessibility-exceptions.json`.
 
 ### The motion inventory
 
-- 24 durations and one keyframe are recorded as distinct effects, each with the reason it is not one of the four families (`docs/design/motion-inventory.json`).
+- 25 durations and one keyframe are recorded as distinct effects, each with the reason it is not one of the four families (`docs/design/motion-inventory.json`).
 
 ## Families whose contract is still partly a business's own
 
diff --git a/packages/webui/src/client/features/workspace/ui/WebuiWorkspaceTabStrip.public.tsx b/packages/webui/src/client/features/workspace/ui/WebuiWorkspaceTabStrip.public.tsx
index 987cab228..9ec6dfc14 100644
--- a/packages/webui/src/client/features/workspace/ui/WebuiWorkspaceTabStrip.public.tsx
+++ b/packages/webui/src/client/features/workspace/ui/WebuiWorkspaceTabStrip.public.tsx
@@ -286,7 +286,7 @@ export function WebuiWorkspaceTabStrip({
   const tabListRef = useRef<HTMLDivElement>(null);
   useEffect(() => {
     tabListRef.current
-      ?.querySelector<HTMLElement>('[aria-selected="true"]')
+      ?.querySelector<HTMLElement>('[aria-pressed="true"]')
       ?.scrollIntoView({ block: "nearest", inline: "nearest" });
   }, [state.activeTabId]);
 
@@ -335,8 +335,7 @@ export function WebuiWorkspaceTabStrip({
             variant="plain"
             size="regular"
             className="webui-workspace-tab-control"
-            role="tab"
-            aria-selected={state.activeTabId === item.id}
+            aria-pressed={state.activeTabId === item.id}
             data-testid={`workspace-tab-${item.id}`}
             onClick={() => dispatch({ type: "select-tab", tabId: item.id })}
           >
diff --git a/packages/webui/src/client/features/workspace/ui/WorkspacePanels.tsx b/packages/webui/src/client/features/workspace/ui/WorkspacePanels.tsx
index c32c9a20a..53fcdb7ee 100644
--- a/packages/webui/src/client/features/workspace/ui/WorkspacePanels.tsx
+++ b/packages/webui/src/client/features/workspace/ui/WorkspacePanels.tsx
@@ -752,7 +752,7 @@ export function WebuiWorkspacePanel({ state, dispatch, sessionId, workspaceDir,
   return <aside ref={panelRef} className={`webui-workspace-panel ${state.expanded ? "is-expanded" : ""} ${panelClosing ? "is-closing" : ""} ${expansionMotion ? `is-${expansionMotion}` : ""}`} onAnimationEnd={handlePanelAnimationEnd} style={panelWidth !== undefined && !state.expanded && surfaceTier === "split" ? { width: `${panelWidth}px`, flex: `0 0 ${panelWidth}px` } : undefined} data-testid="workspace-panel" data-active-tab={tab} data-webui-surface-tier={surfaceTier}>
     <div className="webui-workspace-panel-resize-handle" role="separator" aria-label="调整工作区面板宽度" aria-orientation="vertical" aria-valuenow={Math.round(panelWidth ?? 50)} tabIndex={state.expanded ? -1 : 0} onPointerDown={startPanelResize} onPointerMove={movePanelResize} onPointerUp={stopPanelResize} onPointerCancel={stopPanelResize} onKeyDown={nudgePanelResize} />
     <div className="webui-workspace-panel-header">
-      <div className="webui-workspace-tabs" role="tablist" aria-label="工作区面板标签">
+      <div className="webui-workspace-tabs" role="group" aria-label="工作区面板标签">
         <WebuiWorkspaceTabStrip state={state} dispatch={panelDispatch} sessionId={sessionId} />
       </div>
       <div className="webui-workspace-panel-actions">
diff --git a/packages/webui/src/client/styles/tokens.css b/packages/webui/src/client/styles/tokens.css
index 4ac45df51..63cf5a6dc 100644
--- a/packages/webui/src/client/styles/tokens.css
+++ b/packages/webui/src/client/styles/tokens.css
@@ -280,6 +280,11 @@
   --border_tertiary_hover: var(--opacity_black_1_8);
   --border_tertiary_inactive: var(--opacity_black_1_8);
   --border_tertiary_press: var(--opacity_black_1_15);
+  /* The diff stats are 12px text, and a code colour has to clear WCAG AA
+   * (4.5:1) against the surface it is drawn on. The status colours do not:
+   * the light theme's green measures 2.7:1 on the grouped surface. */
+  --code-theme-addition-foreground: var(--green_700);
+  --code-theme-deletion-foreground: var(--red_600);
   --icon_default_accent: var(--blue_400);
   --icon_default_inverted: var(--gray_0);
   --icon_default_inverted_static: var(--opacity_white_0_95);
@@ -495,6 +500,11 @@
   --border_tertiary_hover: var(--opacity_black_1_8);
   --border_tertiary_inactive: var(--opacity_black_1_8);
   --border_tertiary_press: var(--opacity_black_1_15);
+  /* The diff stats are 12px text, and a code colour has to clear WCAG AA
+   * (4.5:1) against the surface it is drawn on. The status colours do not:
+   * the light theme's green measures 2.7:1 on the grouped surface. */
+  --code-theme-addition-foreground: var(--green_700);
+  --code-theme-deletion-foreground: var(--red_600);
   --icon_default_accent: var(--blue_400);
   --icon_default_inverted: var(--gray_0);
   --icon_default_inverted_static: var(--opacity_white_0_95);
@@ -713,6 +723,10 @@
   --border_tertiary_hover: var(--opacity_white_0_15);
   --border_tertiary_inactive: var(--opacity_white_0_15);
   --border_tertiary_press: var(--opacity_white_0_8);
+  /* The dark theme draws the diff stats on a darker surface, so the code
+   * colours are the lighter steps: they measure 6.3:1 and 5.9:1 there. */
+  --code-theme-addition-foreground: var(--green_400);
+  --code-theme-deletion-foreground: var(--red_300);
   --icon_default_accent: var(--blue_500);
   --icon_default_inverted: var(--gray_1000);
   --icon_default_inverted_static: var(--opacity_white_0_95);
diff --git a/packages/webui/test/browser/acceptance-record.ts b/packages/webui/test/browser/acceptance-record.ts
index 54a41ee95..f91eb94e7 100644
--- a/packages/webui/test/browser/acceptance-record.ts
+++ b/packages/webui/test/browser/acceptance-record.ts
@@ -21,6 +21,7 @@
 import { existsSync, mkdirSync, readFileSync, rmSync, writeFileSync } from "node:fs";
 import { release } from "node:os";
 import { resolve } from "node:path";
+import { fileURLToPath } from "node:url";
 
 /** What one acceptance case observed. */
 export interface AcceptanceObservation {
@@ -153,7 +154,7 @@ export interface AcceptanceRecords {
  * about the process.
  */
 export function acceptanceRecordsFor(plan: WebuiAcceptancePlan): AcceptanceRecords {
-  const recordDir = resolve(new URL(PLAN_DIRECTORIES[plan], import.meta.url).pathname);
+  const recordDir = fileURLToPath(new URL(PLAN_DIRECTORIES[plan], import.meta.url));
   /** The suites of this plan that have written a record in this process. */
   const started = new Set<string>();
 
diff --git a/packages/webui/test/browser/browser-workspace.spec.mjs b/packages/webui/test/browser/browser-workspace.spec.mjs
index c1e09e1bf..637d53349 100644
--- a/packages/webui/test/browser/browser-workspace.spec.mjs
+++ b/packages/webui/test/browser/browser-workspace.spec.mjs
@@ -262,11 +262,11 @@ test("the strip shows the page the runtime published, and the panel follows it",
 
   // Two pages, two rows in the strip. The rows are the workspace's own tabs,
   // so they are found by the page's title -- which is what a person reads.
-  await expect(page.getByRole("tab", { name: "Example Domain" })).toBeVisible();
-  await expect(page.getByRole("tab", { name: "Another Page" })).toBeVisible();
+  await expect(page.getByTestId("workspace-tab-strip").getByRole("button", { name: "Example Domain", exact: true })).toBeVisible();
+  await expect(page.getByTestId("workspace-tab-strip").getByRole("button", { name: "Another Page", exact: true })).toBeVisible();
 
   // Choosing one brings its page to the front, and the address bar names it.
-  await page.getByRole("tab", { name: "Another Page" }).click();
+  await page.getByTestId("workspace-tab-strip").getByRole("button", { name: "Another Page", exact: true }).click();
   await expect(page.getByTestId("browser-toolbar-url")).toHaveValue("https://another.test/");
   await expect(page.getByTestId("browser-panel-frame")).toBeVisible();
 });
@@ -305,7 +305,7 @@ test("a gesture names the page in front, not the page the Agent is on", async ({
   });
   await openApp(page);
   await openPanel(page);
-  await page.getByRole("tab", { name: "Person page" }).click();
+  await page.getByTestId("workspace-tab-strip").getByRole("button", { name: "Person page", exact: true }).click();
   await expect(page.getByTestId("browser-toolbar-url")).toHaveValue("https://person.test/");
 
   await page.getByTestId("browser-panel-frame").click();
diff --git a/packages/webui/test/browser/composer.spec.mjs b/packages/webui/test/browser/composer.spec.mjs
index 37115ccf7..9120a3242 100644
--- a/packages/webui/test/browser/composer.spec.mjs
+++ b/packages/webui/test/browser/composer.spec.mjs
@@ -265,7 +265,7 @@ test("history is per session — B's submissions do not leak into A", async ({ p
 test("attaching a file and an image renders chips that can be removed", async ({ page }) => {
   await openApp(page, "#session=A");
 
-  const fileInput = page.locator('input.webui-composer-hidden-file-input[aria-label="添加文件或图片"]');
+  const fileInput = page.locator('input.webui-file-input[aria-label="添加文件或图片"]');
   await fileInput.setInputFiles([
     { name: "notes.txt", mimeType: "text/plain", buffer: Buffer.from("hello attachment") },
     { name: "pixel.png", mimeType: "image/png", buffer: TINY_PNG },
@@ -295,7 +295,7 @@ test("the directory input accepts a folder selection and renders its chips", asy
     mkdirSync(path.join(folder, "src"));
     writeFileSync(path.join(folder, "root.txt"), "root");
     writeFileSync(path.join(folder, "src", "main.ts"), "export {};\n");
-    const folderInput = page.locator('input.webui-composer-hidden-file-input[aria-label="添加本地文件夹"]');
+    const folderInput = page.locator('input.webui-file-input[aria-label="添加本地文件夹"]');
     await folderInput.setInputFiles(folder);
     const chips = page.locator('[data-webui-composer-attachments="true"]');
     await expect(chips).toBeVisible();
diff --git a/packages/webui/test/browser/plugin-catalogue-layout.spec.mjs-snapshots/Agent-add-form-is-centered-fields-are-aligned-and-backdrop-dismissal-works-1-linux.png b/packages/webui/test/browser/plugin-catalogue-layout.spec.mjs-snapshots/Agent-add-form-is-centered-fields-are-aligned-and-backdrop-dismissal-works-1-linux.png
index f0d58561d..ef5da813e 100644
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diff --git a/packages/webui/test/browser/plugin-catalogue-layout.spec.mjs-snapshots/Skill-add-form-is-centered-usable-and-submits-through-plugin-management-1-linux.png b/packages/webui/test/browser/plugin-catalogue-layout.spec.mjs-snapshots/Skill-add-form-is-centered-usable-and-submits-through-plugin-management-1-linux.png
index d372cf933..94e0c9eeb 100644
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diff --git a/packages/webui/test/browser/questionnaire.spec.mjs b/packages/webui/test/browser/questionnaire.spec.mjs
index d21fe09bb..537b8b4a7 100644
--- a/packages/webui/test/browser/questionnaire.spec.mjs
+++ b/packages/webui/test/browser/questionnaire.spec.mjs
@@ -107,7 +107,7 @@ test("steps forward and back, gating every required step", async ({ page }) => {
 
   // Custom answer on the final step, then the gate opens for submit.
   await page.locator('[data-testid="questionnaire-next"]').click();
-  const other = page.locator('[data-webui-questionnaire-other="s3"] input[type="text"]');
+  const other = page.locator('[data-webui-questionnaire-other="s3"] input.webui-control');
   await other.click();
   await other.fill("我的自定义答案");
   await expect(page.locator('[data-webui-questionnaire-other="s3"]')).toHaveAttribute("data-selected", "true");
diff --git a/packages/webui/test/browser/rendering-integrity.spec.mjs b/packages/webui/test/browser/rendering-integrity.spec.mjs
index c2caa6c10..64c395d02 100644
--- a/packages/webui/test/browser/rendering-integrity.spec.mjs
+++ b/packages/webui/test/browser/rendering-integrity.spec.mjs
@@ -46,6 +46,7 @@ import {
   loadManifest,
   manifestKey,
   saveManifest,
+  settledSurface,
   summariseSurface,
   useTheme,
 } from "./support/rendering-integrity.mjs";
@@ -690,6 +691,7 @@ test.describe("rendering integrity of the migrated surfaces", () => {
           await (state.seed ?? surface.seed)(page, state);
           await state.open(page);
           expect(await appliedTheme(page), `${surface.id}/${state.id}: the theme did not apply`).toBe(theme);
+          await settledSurface(page);
 
           const facts = await captureSurface(page, surface, state);
           const key = manifestKey(surface.id, state.id, theme);
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index 4539d932c..9d2f10711 100644
Binary files a/packages/webui/test/browser/scheduling-panel.spec.mjs-snapshots/scheduling-panel-runs-linux.png and b/packages/webui/test/browser/scheduling-panel.spec.mjs-snapshots/scheduling-panel-runs-linux.png differ
diff --git a/packages/webui/test/browser/settings-account-tab.spec.mjs b/packages/webui/test/browser/settings-account-tab.spec.mjs
index 9add7a5b2..e0c828fbd 100644
--- a/packages/webui/test/browser/settings-account-tab.spec.mjs
+++ b/packages/webui/test/browser/settings-account-tab.spec.mjs
@@ -238,7 +238,7 @@ test("the boundary did not break the healthy app around it", async ({ page }) =>
   await openSettings(page);
   await settingsNavItem(page, "usage").click();
   await expect(page.locator(".webui-settings-content-header h2")).toHaveText("用量与模型");
-  await page.locator('.webui-settings-back[aria-label="返回"]').click();
+  await page.locator(".webui-settings-back").click();
   await expect(settingsDialog(page)).toHaveCount(0);
   await expect(composer).toBeVisible();
   await expect(page.locator('[data-testid="webui-error-boundary"]')).toHaveCount(0);
diff --git a/packages/webui/test/browser/settings-shortcuts.spec.mjs b/packages/webui/test/browser/settings-shortcuts.spec.mjs
index b1009883a..052ea81c5 100644
--- a/packages/webui/test/browser/settings-shortcuts.spec.mjs
+++ b/packages/webui/test/browser/settings-shortcuts.spec.mjs
@@ -36,7 +36,7 @@ async function openSettings(page) {
 
 /** Leaves the settings the way a user does: the 返回应用 button. */
 async function closeSettings(page) {
-  await page.locator('[aria-label="返回"]').click();
+  await page.locator(".webui-settings-back").click();
   await expect(settingsDialog(page)).toHaveCount(0);
 }
 
diff --git a/packages/webui/test/browser/support/rendering-integrity.json b/packages/webui/test/browser/support/rendering-integrity.json
index e107bcbad..015fc73ba 100644
--- a/packages/webui/test/browser/support/rendering-integrity.json
+++ b/packages/webui/test/browser/support/rendering-integrity.json
@@ -15,6 +15,7 @@
         "minHeight": 0,
         "maxHeight": 0,
         "zeroSized": 0,
+        "outsideRootItems": [],
         "outsideRoot": 0
       },
       "texts": {
@@ -37,6 +38,7 @@
         "minHeight": 0,
         "maxHeight": 0,
         "zeroSized": 0,
+        "outsideRootItems": [],
         "outsideRoot": 0
       },
       "texts": {
@@ -59,6 +61,7 @@
         "minHeight": 0,
         "maxHeight": 0,
         "zeroSized": 0,
+        "outsideRootItems": [],
         "outsideRoot": 0
       },
       "texts": {
@@ -81,6 +84,7 @@
         "minHeight": 0,
         "maxHeight": 0,
         "zeroSized": 0,
+        "outsideRootItems": [],
         "outsideRoot": 0
       },
       "texts": {
@@ -103,6 +107,7 @@
         "minHeight": 0,
         "maxHeight": 0,
         "zeroSized": 0,
+        "outsideRootItems": [],
         "outsideRoot": 0
       },
       "texts": {
@@ -125,6 +130,7 @@
         "minHeight": 0,
         "maxHeight": 0,
         "zeroSized": 0,
+        "outsideRootItems": [],
         "outsideRoot": 0
       },
       "texts": {
@@ -147,6 +153,7 @@
         "minHeight": 0,
         "maxHeight": 0,
         "zeroSized": 0,
+        "outsideRootItems": [],
         "outsideRoot": 0
       },
       "texts": {
@@ -169,6 +176,7 @@
         "minHeight": 0,
         "maxHeight": 0,
         "zeroSized": 0,
+        "outsideRootItems": [],
         "outsideRoot": 0
       },
       "texts": {
@@ -180,17 +188,18 @@
     "models-provider-form/empty/dark": {
       "missing": false,
       "root": {
-        "width": 1434,
-        "height": 900,
+        "width": 640,
+        "height": 617,
         "insideViewport": true,
         "insideContainer": true,
         "clipped": false
       },
       "items": {
         "count": 5,
-        "minHeight": 18,
+        "minHeight": 21,
         "maxHeight": 21,
         "zeroSized": 0,
+        "outsideRootItems": [],
         "outsideRoot": 0
       },
       "texts": {
@@ -202,17 +211,18 @@
     "models-provider-form/empty/light": {
       "missing": false,
       "root": {
-        "width": 1434,
-        "height": 900,
+        "width": 640,
+        "height": 617,
         "insideViewport": true,
         "insideContainer": true,
         "clipped": false
       },
       "items": {
         "count": 5,
-        "minHeight": 18,
+        "minHeight": 21,
         "maxHeight": 21,
         "zeroSized": 0,
+        "outsideRootItems": [],
         "outsideRoot": 0
       },
       "texts": {
@@ -224,21 +234,22 @@
     "models-provider-form/longest/dark": {
       "missing": false,
       "root": {
-        "width": 1434,
-        "height": 900,
+        "width": 640,
+        "height": 765,
         "insideViewport": true,
         "insideContainer": true,
         "clipped": false
       },
       "items": {
-        "count": 12,
-        "minHeight": 18,
-        "maxHeight": 40,
+        "count": 14,
+        "minHeight": 21,
+        "maxHeight": 21,
         "zeroSized": 0,
+        "outsideRootItems": [],
         "outsideRoot": 0
       },
       "texts": {
-        "count": 23,
+        "count": 25,
         "clipped": 0,
         "empty": 0
       }
@@ -246,21 +257,22 @@
     "models-provider-form/longest/light": {
       "missing": false,
       "root": {
-        "width": 1434,
-        "height": 900,
+        "width": 640,
+        "height": 765,
         "insideViewport": true,
         "insideContainer": true,
         "clipped": false
       },
       "items": {
-        "count": 12,
-        "minHeight": 18,
-        "maxHeight": 40,
+        "count": 14,
+        "minHeight": 21,
+        "maxHeight": 21,
         "zeroSized": 0,
+        "outsideRootItems": [],
         "outsideRoot": 0
       },
       "texts": {
-        "count": 23,
+        "count": 25,
         "clipped": 0,
         "empty": 0
       }
@@ -268,21 +280,22 @@
     "models-provider-form/maximum/dark": {
       "missing": false,
       "root": {
-        "width": 1434,
-        "height": 900,
+        "width": 640,
+        "height": 765,
         "insideViewport": true,
         "insideContainer": true,
         "clipped": false
       },
       "items": {
-        "count": 12,
-        "minHeight": 18,
-        "maxHeight": 40,
+        "count": 14,
+        "minHeight": 21,
+        "maxHeight": 21,
         "zeroSized": 0,
+        "outsideRootItems": [],
         "outsideRoot": 0
       },
       "texts": {
-        "count": 23,
+        "count": 25,
         "clipped": 0,
         "empty": 0
       }
@@ -290,21 +303,22 @@
     "models-provider-form/maximum/light": {
       "missing": false,
       "root": {
-        "width": 1434,
-        "height": 900,
+        "width": 640,
+        "height": 765,
         "insideViewport": true,
         "insideContainer": true,
         "clipped": false
       },
       "items": {
-        "count": 12,
-        "minHeight": 18,
-        "maxHeight": 40,
+        "count": 14,
+        "minHeight": 21,
+        "maxHeight": 21,
         "zeroSized": 0,
+        "outsideRootItems": [],
         "outsideRoot": 0
       },
       "texts": {
-        "count": 23,
+        "count": 25,
         "clipped": 0,
         "empty": 0
       }
@@ -312,21 +326,22 @@
     "models-provider-form/one/dark": {
       "missing": false,
       "root": {
-        "width": 1434,
-        "height": 900,
+        "width": 640,
+        "height": 765,
         "insideViewport": true,
         "insideContainer": true,
         "clipped": false
       },
       "items": {
-        "count": 12,
-        "minHeight": 18,
-        "maxHeight": 40,
+        "count": 14,
+        "minHeight": 21,
+        "maxHeight": 21,
         "zeroSized": 0,
+        "outsideRootItems": [],
         "outsideRoot": 0
       },
       "texts": {
-        "count": 23,
+        "count": 25,
         "clipped": 0,
         "empty": 0
       }
@@ -334,21 +349,22 @@
     "models-provider-form/one/light": {
       "missing": false,
       "root": {
-        "width": 1434,
-        "height": 900,
+        "width": 640,
+        "height": 765,
         "insideViewport": true,
         "insideContainer": true,
         "clipped": false
       },
       "items": {
-        "count": 12,
-        "minHeight": 18,
-        "maxHeight": 40,
+        "count": 14,
+        "minHeight": 21,
+        "maxHeight": 21,
         "zeroSized": 0,
+        "outsideRootItems": [],
         "outsideRoot": 0
       },
       "texts": {
-        "count": 23,
+        "count": 25,
         "clipped": 0,
         "empty": 0
       }
@@ -356,8 +372,8 @@
     "plugins-mcp-form/empty/dark": {
       "missing": false,
       "root": {
-        "width": 800,
-        "height": 690,
+        "width": 640,
+        "height": 613,
         "insideViewport": true,
         "insideContainer": true,
         "clipped": false
@@ -367,10 +383,11 @@
         "minHeight": 0,
         "maxHeight": 0,
         "zeroSized": 0,
+        "outsideRootItems": [],
         "outsideRoot": 0
       },
       "texts": {
-        "count": 8,
+        "count": 11,
         "clipped": 0,
         "empty": 0
       }
@@ -378,8 +395,8 @@
     "plugins-mcp-form/empty/light": {
       "missing": false,
       "root": {
-        "width": 800,
-        "height": 690,
+        "width": 640,
+        "height": 613,
         "insideViewport": true,
         "insideContainer": true,
         "clipped": false
@@ -389,10 +406,11 @@
         "minHeight": 0,
         "maxHeight": 0,
         "zeroSized": 0,
+        "outsideRootItems": [],
         "outsideRoot": 0
       },
       "texts": {
-        "count": 8,
+        "count": 11,
         "clipped": 0,
         "empty": 0
       }
@@ -400,8 +418,8 @@
     "plugins-mcp-form/longest/dark": {
       "missing": false,
       "root": {
-        "width": 800,
-        "height": 690,
+        "width": 640,
+        "height": 613,
         "insideViewport": true,
         "insideContainer": true,
         "clipped": false
@@ -411,10 +429,11 @@
         "minHeight": 0,
         "maxHeight": 0,
         "zeroSized": 0,
+        "outsideRootItems": [],
         "outsideRoot": 0
       },
       "texts": {
-        "count": 8,
+        "count": 11,
         "clipped": 0,
         "empty": 0
       }
@@ -422,8 +441,8 @@
     "plugins-mcp-form/longest/light": {
       "missing": false,
       "root": {
-        "width": 800,
-        "height": 690,
+        "width": 640,
+        "height": 613,
         "insideViewport": true,
         "insideContainer": true,
         "clipped": false
@@ -433,10 +452,11 @@
         "minHeight": 0,
         "maxHeight": 0,
         "zeroSized": 0,
+        "outsideRootItems": [],
         "outsideRoot": 0
       },
       "texts": {
-        "count": 8,
+        "count": 11,
         "clipped": 0,
         "empty": 0
       }
@@ -444,8 +464,8 @@
     "plugins-mcp-form/one/dark": {
       "missing": false,
       "root": {
-        "width": 800,
-        "height": 690,
+        "width": 640,
+        "height": 613,
         "insideViewport": true,
         "insideContainer": true,
         "clipped": false
@@ -455,10 +475,11 @@
         "minHeight": 0,
         "maxHeight": 0,
         "zeroSized": 0,
+        "outsideRootItems": [],
         "outsideRoot": 0
       },
       "texts": {
-        "count": 8,
+        "count": 11,
         "clipped": 0,
         "empty": 0
       }
@@ -466,8 +487,8 @@
     "plugins-mcp-form/one/light": {
       "missing": false,
       "root": {
-        "width": 800,
-        "height": 690,
+        "width": 640,
+        "height": 613,
         "insideViewport": true,
         "insideContainer": true,
         "clipped": false
@@ -477,10 +498,11 @@
         "minHeight": 0,
         "maxHeight": 0,
         "zeroSized": 0,
+        "outsideRootItems": [],
         "outsideRoot": 0
       },
       "texts": {
-        "count": 8,
+        "count": 11,
         "clipped": 0,
         "empty": 0
       }
@@ -499,6 +521,7 @@
         "minHeight": 0,
         "maxHeight": 0,
         "zeroSized": 0,
+        "outsideRootItems": [],
         "outsideRoot": 0
       },
       "texts": {
@@ -521,6 +544,7 @@
         "minHeight": 0,
         "maxHeight": 0,
         "zeroSized": 0,
+        "outsideRootItems": [],
         "outsideRoot": 0
       },
       "texts": {
@@ -543,6 +567,7 @@
         "minHeight": 0,
         "maxHeight": 0,
         "zeroSized": 0,
+        "outsideRootItems": [],
         "outsideRoot": 0
       },
       "texts": {
@@ -565,6 +590,7 @@
         "minHeight": 0,
         "maxHeight": 0,
         "zeroSized": 0,
+        "outsideRootItems": [],
         "outsideRoot": 0
       },
       "texts": {
@@ -587,6 +613,7 @@
         "minHeight": 0,
         "maxHeight": 0,
         "zeroSized": 0,
+        "outsideRootItems": [],
         "outsideRoot": 0
       },
       "texts": {
@@ -609,6 +636,7 @@
         "minHeight": 0,
         "maxHeight": 0,
         "zeroSized": 0,
+        "outsideRootItems": [],
         "outsideRoot": 0
       },
       "texts": {
@@ -631,6 +659,7 @@
         "minHeight": 0,
         "maxHeight": 0,
         "zeroSized": 0,
+        "outsideRootItems": [],
         "outsideRoot": 0
       },
       "texts": {
@@ -653,6 +682,7 @@
         "minHeight": 0,
         "maxHeight": 0,
         "zeroSized": 0,
+        "outsideRootItems": [],
         "outsideRoot": 0
       },
       "texts": {
@@ -675,6 +705,7 @@
         "minHeight": 0,
         "maxHeight": 0,
         "zeroSized": 0,
+        "outsideRootItems": [],
         "outsideRoot": 0
       },
       "texts": {
@@ -697,6 +728,7 @@
         "minHeight": 0,
         "maxHeight": 0,
         "zeroSized": 0,
+        "outsideRootItems": [],
         "outsideRoot": 0
       },
       "texts": {
@@ -719,6 +751,7 @@
         "minHeight": 0,
         "maxHeight": 0,
         "zeroSized": 0,
+        "outsideRootItems": [],
         "outsideRoot": 0
       },
       "texts": {
@@ -741,6 +774,7 @@
         "minHeight": 0,
         "maxHeight": 0,
         "zeroSized": 0,
+        "outsideRootItems": [],
         "outsideRoot": 0
       },
       "texts": {
@@ -763,6 +797,7 @@
         "minHeight": 0,
         "maxHeight": 0,
         "zeroSized": 0,
+        "outsideRootItems": [],
         "outsideRoot": 0
       },
       "texts": {
@@ -785,6 +820,7 @@
         "minHeight": 0,
         "maxHeight": 0,
         "zeroSized": 0,
+        "outsideRootItems": [],
         "outsideRoot": 0
       },
       "texts": {
@@ -807,6 +843,7 @@
         "minHeight": 0,
         "maxHeight": 0,
         "zeroSized": 0,
+        "outsideRootItems": [],
         "outsideRoot": 0
       },
       "texts": {
@@ -829,6 +866,7 @@
         "minHeight": 0,
         "maxHeight": 0,
         "zeroSized": 0,
+        "outsideRootItems": [],
         "outsideRoot": 0
       },
       "texts": {
@@ -841,7 +879,7 @@
       "missing": false,
       "root": {
         "width": 864,
-        "height": 353,
+        "height": 337,
         "insideViewport": true,
         "insideContainer": true,
         "clipped": false
@@ -851,6 +889,7 @@
         "minHeight": 0,
         "maxHeight": 0,
         "zeroSized": 0,
+        "outsideRootItems": [],
         "outsideRoot": 0
       },
       "texts": {
@@ -863,7 +902,7 @@
       "missing": false,
       "root": {
         "width": 864,
-        "height": 353,
+        "height": 337,
         "insideViewport": true,
         "insideContainer": true,
         "clipped": false
@@ -873,6 +912,7 @@
         "minHeight": 0,
         "maxHeight": 0,
         "zeroSized": 0,
+        "outsideRootItems": [],
         "outsideRoot": 0
       },
       "texts": {
@@ -895,6 +935,7 @@
         "minHeight": 0,
         "maxHeight": 0,
         "zeroSized": 0,
+        "outsideRootItems": [],
         "outsideRoot": 0
       },
       "texts": {
@@ -917,6 +958,7 @@
         "minHeight": 0,
         "maxHeight": 0,
         "zeroSized": 0,
+        "outsideRootItems": [],
         "outsideRoot": 0
       },
       "texts": {
@@ -939,6 +981,7 @@
         "minHeight": 0,
         "maxHeight": 0,
         "zeroSized": 0,
+        "outsideRootItems": [],
         "outsideRoot": 0
       },
       "texts": {
@@ -961,6 +1004,7 @@
         "minHeight": 0,
         "maxHeight": 0,
         "zeroSized": 0,
+        "outsideRootItems": [],
         "outsideRoot": 0
       },
       "texts": {
@@ -983,6 +1027,7 @@
         "minHeight": 0,
         "maxHeight": 0,
         "zeroSized": 0,
+        "outsideRootItems": [],
         "outsideRoot": 0
       },
       "texts": {
@@ -1005,6 +1050,7 @@
         "minHeight": 0,
         "maxHeight": 0,
         "zeroSized": 0,
+        "outsideRootItems": [],
         "outsideRoot": 0
       },
       "texts": {
@@ -1027,6 +1073,7 @@
         "minHeight": 0,
         "maxHeight": 0,
         "zeroSized": 0,
+        "outsideRootItems": [],
         "outsideRoot": 0
       },
       "texts": {
@@ -1049,6 +1096,7 @@
         "minHeight": 0,
         "maxHeight": 0,
         "zeroSized": 0,
+        "outsideRootItems": [],
         "outsideRoot": 0
       },
       "texts": {
diff --git a/packages/webui/test/browser/support/rendering-integrity.mjs b/packages/webui/test/browser/support/rendering-integrity.mjs
index 578c97961..752de3805 100644
--- a/packages/webui/test/browser/support/rendering-integrity.mjs
+++ b/packages/webui/test/browser/support/rendering-integrity.mjs
@@ -39,6 +39,26 @@ export const THEMES = ["light", "dark"];
 export const EXTREMES = ["empty", "one", "maximum", "longest"];
 
 /** Load the recorded measurements, or an empty manifest when none exists yet. */
+/**
+ * Wait for the surface to stop moving.
+ *
+ * The shared dialog enters over 200ms and the surfaces fade in. A scan that
+ * runs while an entrance is still playing measures a surface the reader never
+ * sees: the dialog's own backdrop is still transparent, and a contrast
+ * finding is the difference between a settled background and a moving one.
+ * The wait is for the animations that are running now, and it gives up
+ * rather than hanging on one that never finishes.
+ */
+export async function settledSurface(page) {
+  await page.evaluate(async () => {
+    const running = document.getAnimations().filter((animation) => animation.playState === "running");
+    await Promise.race([
+      Promise.all(running.map((animation) => animation.finished.catch(() => undefined))),
+      new Promise((resolve) => setTimeout(resolve, 1000)),
+    ]);
+  });
+}
+
 export function loadManifest() {
   try {
     return JSON.parse(readFileSync(MANIFEST_PATH, "utf8"));
@@ -130,17 +150,43 @@ async function measure(page, surface, state) {
 
       const items = spec.itemSelector ? [...rootNode.querySelectorAll(spec.itemSelector)] : [];
       const itemBoxes = items.map((node) => node.getBoundingClientRect());
+
+      // A surface may scroll its own content: a modal with a fixed header and a
+      // scrolling body puts what it shows below the fold, and that content is
+      // reachable by scrolling — the contract a scroll boundary states, and the
+      // same contract the clipped check above already honours. Only an item
+      // that no scroll boundary can bring back into view is outside the
+      // surface.
+      const scrollsOn = (node, axis) => {
+        const style = getComputedStyle(node);
+        const value = axis === "x" ? style.overflowX : style.overflowY;
+        return value === "auto" || value === "scroll" || value === "overlay";
+      };
+      // The nearest scroll boundary between the item and the root, on one
+      // axis. A boundary inside the surface can bring the item back into
+      // view; one outside it moves the surface along with the item, so it
+      // cannot.
+      const scrollBoundary = (node, axis) => {
+        for (let current = node.parentElement; current; current = current.parentElement) {
+          if (current === rootNode) return scrollsOn(current, axis) ? current : null;
+          if (scrollsOn(current, axis)) return current;
+        }
+        return null;
+      };
+      const escapes = (node, box) => {
+        const sideways = box.left < rootBox.left - 1 || box.right > rootBox.right + 1;
+        const downwards = box.top < rootBox.top - 1 || box.bottom > rootBox.bottom + 1;
+        if (sideways && !scrollBoundary(node, "x")) return true;
+        if (downwards && !scrollBoundary(node, "y")) return true;
+        return false;
+      };
+
       // Which items are outside, not just how many: a count sends the reader
       // back to the browser to find out what the gate already knew.
-      const outsideItems = items
+      const escaping = items
         .map((node, index) => ({ node, box: itemBoxes[index] }))
-        .filter(
-          ({ box }) =>
-            box.left < rootBox.left - 1 ||
-            box.right > rootBox.right + 1 ||
-            box.top < rootBox.top - 1 ||
-            box.bottom > rootBox.bottom + 1,
-        )
+        .filter(({ node, box }) => escapes(node, box));
+      const outsideItems = escaping
         .slice(0, 8)
         .map(
           ({ node, box }) =>
@@ -193,13 +239,7 @@ async function measure(page, surface, state) {
           maxHeight: itemHeights.length ? Math.max(...itemHeights) : 0,
           zeroSized: itemBoxes.filter((box) => box.width <= 0 || box.height <= 0).length,
           outsideRootItems: outsideItems,
-          outsideRoot: itemBoxes.filter(
-            (box) =>
-              box.left < rootBox.left - 1 ||
-              box.right > rootBox.right + 1 ||
-              box.top < rootBox.top - 1 ||
-              box.bottom > rootBox.bottom + 1,
-          ).length,
+          outsideRoot: escaping.length,
         },
         texts: {
           count: texts.length,
diff --git a/packages/webui/test/browser/terminal-cross-page.spec.mjs b/packages/webui/test/browser/terminal-cross-page.spec.mjs
index 378337eea..68d8b6b89 100644
--- a/packages/webui/test/browser/terminal-cross-page.spec.mjs
+++ b/packages/webui/test/browser/terminal-cross-page.spec.mjs
@@ -29,7 +29,7 @@ const openTerminalTab = async (page) => {
     .getByTestId("workspace-panel-controls")
     .getByRole("button", { name: "浏览器" })
     .click();
-  const existing = page.getByTestId("workspace-panel").getByRole("tab", { name: "终端" });
+  const existing = page.getByTestId("workspace-panel").getByRole("button", { name: "终端", exact: true });
   if (await existing.count()) {
     await existing.click();
     return;
diff --git a/packages/webui/test/browser/visual-baselines.spec.mjs-snapshots/composer-command-overlay-linux.png b/packages/webui/test/browser/visual-baselines.spec.mjs-snapshots/composer-command-overlay-linux.png
index 44e734a05..88d0a2902 100644
Binary files a/packages/webui/test/browser/visual-baselines.spec.mjs-snapshots/composer-command-overlay-linux.png and b/packages/webui/test/browser/visual-baselines.spec.mjs-snapshots/composer-command-overlay-linux.png differ
diff --git a/packages/webui/test/browser/visual-baselines.spec.mjs-snapshots/embedded-browser-panel-linux.png b/packages/webui/test/browser/visual-baselines.spec.mjs-snapshots/embedded-browser-panel-linux.png
index 822bee323..865afd4f7 100644
Binary files a/packages/webui/test/browser/visual-baselines.spec.mjs-snapshots/embedded-browser-panel-linux.png and b/packages/webui/test/browser/visual-baselines.spec.mjs-snapshots/embedded-browser-panel-linux.png differ
diff --git a/packages/webui/test/browser/visual-baselines.spec.mjs-snapshots/mcp-management-linux.png b/packages/webui/test/browser/visual-baselines.spec.mjs-snapshots/mcp-management-linux.png
index 85ee8a08d..6c9dc5250 100644
Binary files a/packages/webui/test/browser/visual-baselines.spec.mjs-snapshots/mcp-management-linux.png and b/packages/webui/test/browser/visual-baselines.spec.mjs-snapshots/mcp-management-linux.png differ
diff --git a/packages/webui/test/browser/visual-baselines.spec.mjs-snapshots/plugin-marketplace-linux.png b/packages/webui/test/browser/visual-baselines.spec.mjs-snapshots/plugin-marketplace-linux.png
index 4d4eefbe5..0e5ffbadd 100644
Binary files a/packages/webui/test/browser/visual-baselines.spec.mjs-snapshots/plugin-marketplace-linux.png and b/packages/webui/test/browser/visual-baselines.spec.mjs-snapshots/plugin-marketplace-linux.png differ
diff --git a/packages/webui/test/browser/visual-baselines.spec.mjs-snapshots/progress-panel-linux.png b/packages/webui/test/browser/visual-baselines.spec.mjs-snapshots/progress-panel-linux.png
index a95e7634d..5b5031469 100644
Binary files a/packages/webui/test/browser/visual-baselines.spec.mjs-snapshots/progress-panel-linux.png and b/packages/webui/test/browser/visual-baselines.spec.mjs-snapshots/progress-panel-linux.png differ
diff --git a/packages/webui/test/browser/visual-baselines.spec.mjs-snapshots/settings-dialog-linux.png b/packages/webui/test/browser/visual-baselines.spec.mjs-snapshots/settings-dialog-linux.png
index bb8c0ff6f..7bda04460 100644
Binary files a/packages/webui/test/browser/visual-baselines.spec.mjs-snapshots/settings-dialog-linux.png and b/packages/webui/test/browser/visual-baselines.spec.mjs-snapshots/settings-dialog-linux.png differ
diff --git a/packages/webui/test/browser/visual-baselines.spec.mjs-snapshots/shell-and-rail-linux.png b/packages/webui/test/browser/visual-baselines.spec.mjs-snapshots/shell-and-rail-linux.png
index 857cad5bd..c44524216 100644
Binary files a/packages/webui/test/browser/visual-baselines.spec.mjs-snapshots/shell-and-rail-linux.png and b/packages/webui/test/browser/visual-baselines.spec.mjs-snapshots/shell-and-rail-linux.png differ
diff --git a/packages/webui/test/browser/visual-baselines.spec.mjs-snapshots/skill-management-linux.png b/packages/webui/test/browser/visual-baselines.spec.mjs-snapshots/skill-management-linux.png
index 0666141ae..8eb7285fd 100644
Binary files a/packages/webui/test/browser/visual-baselines.spec.mjs-snapshots/skill-management-linux.png and b/packages/webui/test/browser/visual-baselines.spec.mjs-snapshots/skill-management-linux.png differ
diff --git a/packages/webui/test/browser/visual-baselines.spec.mjs-snapshots/skill-marketplace-linux.png b/packages/webui/test/browser/visual-baselines.spec.mjs-snapshots/skill-marketplace-linux.png
index fb1f1f0e2..07c54167a 100644
Binary files a/packages/webui/test/browser/visual-baselines.spec.mjs-snapshots/skill-marketplace-linux.png and b/packages/webui/test/browser/visual-baselines.spec.mjs-snapshots/skill-marketplace-linux.png differ
diff --git a/packages/webui/test/browser/visual-baselines.spec.mjs-snapshots/transcript-and-composer-linux.png b/packages/webui/test/browser/visual-baselines.spec.mjs-snapshots/transcript-and-composer-linux.png
index 2443e4bf2..dd05acec2 100644
Binary files a/packages/webui/test/browser/visual-baselines.spec.mjs-snapshots/transcript-and-composer-linux.png and b/packages/webui/test/browser/visual-baselines.spec.mjs-snapshots/transcript-and-composer-linux.png differ
diff --git a/packages/webui/test/browser/workspace-panel-actions.spec.mjs b/packages/webui/test/browser/workspace-panel-actions.spec.mjs
index 696d96c83..f83313df1 100644
--- a/packages/webui/test/browser/workspace-panel-actions.spec.mjs
+++ b/packages/webui/test/browser/workspace-panel-actions.spec.mjs
@@ -111,8 +111,8 @@ test("an open preview tab survives leaving the session and coming back", async (
   // so the panel re-renders from a store that never asked the runtime again.
   await expect(preview).toBeVisible();
   await expect(preview).toContainText("export const answer = 42;");
-  await expect(page.getByRole("tab", { name: /a\.ts/u })).toHaveAttribute(
-    "aria-selected",
+  await expect(page.getByRole("button", { name: "a.ts", exact: true })).toHaveAttribute(
+    "aria-pressed",
     "true",
   );
   expect(
diff --git a/packages/webui/test/browser/zone-error-recovery.spec.mjs b/packages/webui/test/browser/zone-error-recovery.spec.mjs
index 7bd1dd504..b2f3e9c90 100644
--- a/packages/webui/test/browser/zone-error-recovery.spec.mjs
+++ b/packages/webui/test/browser/zone-error-recovery.spec.mjs
@@ -61,7 +61,7 @@ for (const zone of ["workspace", "settings", "plugins"]) {
     await page.evaluate(() => { window.__syntheticZoneFault = undefined; });
     await retry.click();
     await expect(retry).toHaveCount(0);
-    if (zone === "settings") await page.getByRole("button", { name: "返回" , exact: true }).click();
+    if (zone === "settings") await page.locator(".webui-settings-back").click();
     if (zone === "plugins") {
       await page.locator('[data-webui-session-link="B"]').click({ position: { x: 20, y: 15 } });
       await expect(composer).toBeVisible();
diff --git a/packages/webui/test/integration/agent-transcript.test.ts b/packages/webui/test/integration/agent-transcript.test.ts
index 3e67d15ec..fdecaffe5 100644
--- a/packages/webui/test/integration/agent-transcript.test.ts
+++ b/packages/webui/test/integration/agent-transcript.test.ts
@@ -577,16 +577,29 @@ it("a real agent turn resumes after refresh and drains a queued message in order
     await persistedSourceActions.getByRole("button", { name: "回退" }).click();
     const persistedSourceRewindDialog = page.getByTestId("rewind-preview-dialog");
     await browserExpect(persistedSourceRewindDialog).toBeVisible();
+    // The shared dialog enters over 200ms, and the entrance moves it. The
+    // geometry is the dialog's own geometry only once the entrance has
+    // settled, so the measurement waits for it.
+    await persistedSourceRewindDialog.evaluate((node) => Promise.all(node.getAnimations({ subtree: true }).map((animation) => animation.finished)));
     const rewindGeometry = await persistedSourceRewindDialog.evaluate((node) => {
-      const viewportWidth = document.body.clientWidth;
-      const viewportHeight = document.body.clientHeight;
+      // The mask is `position: fixed; inset: 0`, so it spans the viewport and
+      // the surface is centred inside it. The viewport is `innerWidth` and not
+      // `document.body.clientWidth`: the body box excludes the scrollbar the
+      // mask covers, and comparing a fixed element against a smaller box makes
+      // a centred surface look 3px off-centre.
+      const viewportWidth = window.innerWidth;
+      const viewportHeight = window.innerHeight;
       const dialog = node.getBoundingClientRect();
-      const surface = node.querySelector(".webui-message-dialog-surface")!.getBoundingClientRect();
-      const buttons = [...node.querySelectorAll<HTMLButtonElement>(".webui-message-dialog-actions button")];
+      // The shared dialog carries its test id on the surface; the scrim it
+      // sits in is the mask around it.
+      const backdrop = node.parentElement!;
+      const backdropRect = backdrop.getBoundingClientRect();
+      const surface = dialog;
+      const buttons = [...node.querySelectorAll<HTMLButtonElement>(".webui-dialog-actions button")];
       return {
-        fixedBackdrop: getComputedStyle(node).position === "fixed",
-        backdropCoversViewport: dialog.left <= 0 && dialog.top <= 0 &&
-          dialog.right >= viewportWidth && dialog.bottom >= viewportHeight,
+        fixedBackdrop: getComputedStyle(backdrop).position === "fixed",
+        backdropCoversViewport: backdropRect.left <= 0 && backdropRect.top <= 0 &&
+          backdropRect.right >= viewportWidth && backdropRect.bottom >= viewportHeight,
         centered: Math.abs(surface.left + surface.width / 2 - viewportWidth / 2) < 3 &&
           Math.abs(surface.top + surface.height / 2 - viewportHeight / 2) < 3,
         surfaceWithinViewport: surface.left >= 0 && surface.top >= 0 &&
@@ -597,9 +610,9 @@ it("a real agent turn resumes after refresh and drains a queued message in order
             rect.top >= 0 && rect.bottom <= viewportHeight && !button.disabled;
         }),
         portalClientBox: { width: viewportWidth, height: viewportHeight },
-        backdropRect: { left: dialog.left, top: dialog.top, right: dialog.right, bottom: dialog.bottom },
+        backdropRect: { left: backdropRect.left, top: backdropRect.top, right: backdropRect.right, bottom: backdropRect.bottom },
         surfaceRect: { left: surface.left, top: surface.top, right: surface.right, bottom: surface.bottom },
-        grid: { display: getComputedStyle(node).display, placeItems: getComputedStyle(node).placeItems },
+        grid: { display: getComputedStyle(backdrop).display, placeItems: getComputedStyle(backdrop).placeItems },
       };
     });
     expect(rewindGeometry, JSON.stringify(rewindGeometry)).toMatchObject({
@@ -1028,7 +1041,7 @@ it("a real agent turn resumes after refresh and drains a queued message in order
     expect(modelRequests.some((request) => request.body.includes("Create a task checklist.") &&
       request.body.includes("todowrite"))).toBe(true);
 
-    const attachmentInput = page.locator('input.webui-composer-hidden-file-input[aria-label="添加文件或图片"]');
+    const attachmentInput = page.locator('input.webui-file-input[aria-label="添加文件或图片"]');
     await attachmentInput.setInputFiles({
       name: "runtime-note.txt",
       mimeType: "text/plain",
@@ -1193,6 +1206,10 @@ it("a real agent turn resumes after refresh and drains a queued message in order
     await page.getByRole("menuitem", { name: "添加 MCP server" }).click();
     const mcpDialog = page.getByRole("dialog", { name: "MCP Server" });
     await browserExpect(mcpDialog).toBeVisible();
+    // The shared dialog enters over 200ms, and the entrance moves it. The
+    // geometry is the dialog's own geometry only once the entrance has
+    // settled, so the measurement waits for it.
+    await mcpDialog.evaluate((node) => Promise.all(node.getAnimations({ subtree: true }).map((animation) => animation.finished)));
     const mcpGeometry = await mcpDialog.evaluate((node) => {
       const backdrop = node.parentElement;
       const rect = node.getBoundingClientRect();
diff --git a/packages/webui/test/integration/miniapp-real-flow-support.ts b/packages/webui/test/integration/miniapp-real-flow-support.ts
index 66afc61a5..dc5428ab0 100644
--- a/packages/webui/test/integration/miniapp-real-flow-support.ts
+++ b/packages/webui/test/integration/miniapp-real-flow-support.ts
@@ -67,7 +67,16 @@ export async function closeAllBootedHosts(): Promise<void> {
 export async function bootRealHost(
   options: { readonly dev?: boolean; readonly serveBuiltClient?: boolean } = {},
 ): Promise<Booted> {
-  const dataDir = await mkdtemp(join(tmpdir(), "webui-miniapp-flow-"));
+  // The host's unix socket path is built from this directory: the plugin's
+  // own data directory sits under it, and the socket file under that. A unix
+  // socket path may not exceed 104 characters, and the macOS runner's
+  // temporary directory alone is 44 characters deep, so a fixture directory
+  // under it leaves too little room for the rest of the path. On the
+  // platforms that use a unix socket the fixture therefore lives directly
+  // under /tmp; Windows uses a named pipe and keeps the temporary directory.
+  const dataDir = await mkdtemp(
+    join(process.platform === "win32" ? tmpdir() : "/tmp", "webui-mf-"),
+  );
   const workspaceDir = join(dataDir, "workspace");
   await mkdir(workspaceDir, { recursive: true });
   // A config file that already exists stops `ensureConfigFile()` from copying the
diff --git a/packages/webui/test/integration/real-host-loopback.test.ts b/packages/webui/test/integration/real-host-loopback.test.ts
index 63f59149d..b32c8b5d1 100644
--- a/packages/webui/test/integration/real-host-loopback.test.ts
+++ b/packages/webui/test/integration/real-host-loopback.test.ts
@@ -343,6 +343,10 @@ describe("real host over the loopback service", () => {
       await page.getByRole("menuitem", { name: "添加 MCP server" }).click();
       const dialog = page.getByRole("dialog", { name: "MCP Server" });
       await browserExpect(dialog).toBeVisible();
+      // The shared dialog enters over 200ms, and the entrance moves it. The
+      // geometry is the dialog's own geometry only once the entrance has
+      // settled, so the measurement waits for it.
+      await dialog.evaluate((node) => Promise.all(node.getAnimations({ subtree: true }).map((animation) => animation.finished)));
       const geometry = await dialog.evaluate((node) => {
         const backdrop = node.parentElement!;
         const backdropRect = backdrop.getBoundingClientRect();
diff --git a/packages/webui/test/unit/webui-shell.test.ts b/packages/webui/test/unit/webui-shell.test.ts
index 8894e4057..4847db67b 100644
--- a/packages/webui/test/unit/webui-shell.test.ts
+++ b/packages/webui/test/unit/webui-shell.test.ts
@@ -948,8 +948,11 @@ describe("WebUI shell", () => {
       /\.webui-session-leading-marker\s*\{([^}]*)\}/u,
     );
     expect(leadingMarkerRule, "session leading marker rule is missing").not.toBeNull();
-    expect(leadingMarkerRule![1]).toMatch(/width:\s*18px/u);
-    expect(leadingMarkerRule![1]).toMatch(/flex:\s*0\s+0\s+18px/u);
+    // The column is 24px wide because the disclosure inside it is a 24px
+    // target; an 18px column clipped the one place a session row is opened
+    // from. The stylesheet says so where the rule is written.
+    expect(leadingMarkerRule![1]).toMatch(/width:\s*24px/u);
+    expect(leadingMarkerRule![1]).toMatch(/flex:\s*0\s+0\s+24px/u);
   });
 
   it("keeps subagent sessions visibly nested under their parent session", () => {
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index 8b647eff7..86c9c3c6d 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -21,7 +21,7 @@ importers:
   .:
     devDependencies:
       '@axe-core/playwright':
-        specifier: ^4.14.0
+        specifier: 4.14.0
         version: 4.14.0(playwright-core@1.63.0)
       '@playwright/test':
         specifier: ^1.63.0
@@ -39,7 +39,7 @@ importers:
         specifier: 7.0.0-dev.20260707.2
         version: 7.0.0-dev.20260707.2
       axe-core:
-        specifier: ^4.14.0
+        specifier: 4.14.0
         version: 4.14.0
       esbuild:
         specifier: 0.28.2
diff --git a/release/public-source.json b/release/public-source.json
index 3bef2a73d..eddecc502 100644
--- a/release/public-source.json
+++ b/release/public-source.json
@@ -115,7 +115,6 @@
     ".plan/workspace-browser-tab/complete/two-page-spike.json",
     ".plan/workspace-browser-tab/complete/workspace-browser-tab.acceptance.json",
     ".plan/workspace-browser-tab/workspace-browser-tab-plan.md",
-    ".temp/desktop-webui-capability-gaps.md",
     "AGENTS.md",
     "CONTEXT.md",
     "CONTRIBUTING.md",
diff --git a/scripts/lib/webui-presentation-inventory.json b/scripts/lib/webui-presentation-inventory.json
index a30e55a9c..55600b0c1 100644
--- a/scripts/lib/webui-presentation-inventory.json
+++ b/scripts/lib/webui-presentation-inventory.json
@@ -228,14 +228,14 @@
     "features/transcript/ui/markdown.public.tsx": "125a314c717770f5",
     "features/transcript/ui/webui-mermaid.tsx": "fc1aab96c48f3a3d",
     "features/workspace/ui/WebuiWorkspaceDirectoryBrowser.public.tsx": "9feb6e3d2b274a52",
-    "features/workspace/ui/WebuiWorkspaceTabStrip.public.tsx": "b267d52d32598fdd",
+    "features/workspace/ui/WebuiWorkspaceTabStrip.public.tsx": "4d45a3b6e622571c",
     "features/workspace/ui/WorkspaceArchiveView.tsx": "b4ac1e613b7eff7c",
     "features/workspace/ui/WorkspaceCanvas.tsx": "cb7f6f22caa93fd0",
     "features/workspace/ui/WorkspaceFileTree.tsx": "606b6b0696e488b7",
     "features/workspace/ui/WorkspaceHtmlPreview.tsx": "f19ad21c5fe816f1",
     "features/workspace/ui/WorkspaceMediaPreview.tsx": "cbeadd98697a96c9",
     "features/workspace/ui/WorkspacePanelControls.tsx": "36d3cfa00459a60a",
-    "features/workspace/ui/WorkspacePanels.tsx": "9c2df5d705fbb2fb",
+    "features/workspace/ui/WorkspacePanels.tsx": "8137d1d6980c6917",
     "features/workspace/ui/WorkspaceProgressPanel.tsx": "e05e76aca83cf877",
     "shell/ArchonPage.tsx": "ce4b452ba9bb68ac",
     "shell/ArchonShell.tsx": "3dfc406588433f84",
diff --git a/test/source-sync.test.mjs b/test/source-sync.test.mjs
index c1e324183..49a569e7a 100644
--- a/test/source-sync.test.mjs
+++ b/test/source-sync.test.mjs
@@ -1329,7 +1329,10 @@ function filesWritingVersion(repositoryRoot, version) {
       const full = path.join(directory, entry.name);
       if (entry.isDirectory()) walk(full);
       else if (/\.(?:ts|tsx|mts|mjs|cjs|js|jsx)$/u.test(entry.name) && readFileSync(full, 'utf8').includes(version)) {
-        offenders.push(path.relative(repositoryRoot, full));
+        // path.relative returns backslashes on Windows, and the offender is
+        // named by a forward-slash path. The comparison below reads the
+        // offender's own name, so the separator has to be the same one.
+        offenders.push(path.relative(repositoryRoot, full).split(path.sep).join("/"));
       }
     }
   };