refactor(tui): drop dead notice field, dedupe helpers

src/tui/components/at-mention/list.ts

@@ -39,8 +39,18 @@ export async function listPathSuggestions(
     // prefix as filter (the `@` alone case, like `ls`).
     const lastSlash = rest.lastIndexOf("/");
     const hasSlash = lastSlash !== -1;
-    const dir = endsWithSep ? rest || "." : hasSlash ? dirname(rest) : ".";
-    const fragment = endsWithSep ? "" : hasSlash ? basename(rest) : rest;
+    let dir: string;
+    let fragment: string;
+    if (endsWithSep) {
+      dir = rest || ".";
+      fragment = "";
+    } else if (hasSlash) {
+      dir = dirname(rest);
+      fragment = basename(rest);
+    } else {
+      dir = ".";
+      fragment = rest;
+    }
     const realDir = await resolveDirectory(dir, base);
     if (realDir === null) return [];
 
@@ -56,16 +66,22 @@ export async function listPathSuggestions(
       // Reconstruct the path the user would type: bare fragments are shown
       // relative to cwd (dirPrefix ""), and home-relative results keep the
       // `~/` form so the completion inserts text the submit path expands.
-      const innerPrefix = endsWithSep
-        ? rest
-        : hasSlash
-          ? rest.slice(0, rest.length - fragment.length)
-          : "";
-      const dirPrefix = homeRelative
-        ? `~/${innerPrefix}`
-        : endsWithSep
-          ? prefix
-          : innerPrefix;
+      let innerPrefix: string;
+      if (endsWithSep) {
+        innerPrefix = rest;
+      } else if (hasSlash) {
+        innerPrefix = rest.slice(0, rest.length - fragment.length);
+      } else {
+        innerPrefix = "";
+      }
+      let dirPrefix: string;
+      if (homeRelative) {
+        dirPrefix = `~/${innerPrefix}`;
+      } else if (endsWithSep) {
+        dirPrefix = prefix;
+      } else {
+        dirPrefix = innerPrefix;
+      }
       matched.push(dirPrefix + entry.name + (entry.isDirectory() ? "/" : ""));
     }
 

src/tui/copy-path.ts

@@ -6,6 +6,7 @@
 
 import { diffPlainText } from "./diff.js";
 import type { StreamRow } from "./stream.js";
+import { abbreviate } from "./tool-formatter.js";
 
 export type CopyKind = "message" | "tool" | "diff" | "system";
 
@@ -72,11 +73,6 @@ export function createRecordingClipboard(): ClipboardPort & {
   };
 }
 
-function oneLine(text: string, max = 56): string {
-  const collapsed = text.replace(/\s+/g, " ").trim();
-  return collapsed.length > max ? `${collapsed.slice(0, max - 1)}…` : collapsed;
-}
-
 /**
  * Infer copy kind from a stream row.
  * Rows carrying a rendered edit diff win; otherwise assistant/tool rows whose
@@ -154,7 +150,7 @@ export function buildCopyTargets(log: readonly StreamRow[]): CopyTarget[] {
     targets.push({
       id: `row-${i}`,
       label: copyRowLabel(row),
-      preview: oneLine(payload.text),
+      preview: abbreviate(payload.text, 56),
       text: payload.text,
     });
   }

src/tui/markdown-parser.ts

@@ -782,6 +782,20 @@ export interface MarkdownSplit {
   readonly gapRows: number;
 }
 
+/** Build a split whose live tail starts at `firstContent`; one blank line
+ * between the frozen boundary and the live tail collapses to a single gap row. */
+function settledSplit(
+  frozen: string,
+  rest: string[],
+  firstContent: number,
+): MarkdownSplit {
+  return {
+    frozen,
+    live: rest.slice(firstContent).join("\n"),
+    gapRows: firstContent > 0 ? 1 : 0,
+  };
+}
+
 export function splitAtSettledHeading(text: string): MarkdownSplit | null {
   const lines = text.split("\n");
   const insideFence = fencedLineMask(lines);
@@ -797,11 +811,11 @@ export function splitAtSettledHeading(text: string): MarkdownSplit | null {
   const firstContent = rest.findIndex((line) => line.trim().length > 0);
   // Heading closed but nothing has started under it yet.
   if (firstContent === -1) return null;
-  return {
-    frozen: lines.slice(0, boundary + 1).join("\n"),
-    live: rest.slice(firstContent).join("\n"),
-    gapRows: firstContent > 0 ? 1 : 0,
-  };
+  return settledSplit(
+    lines.slice(0, boundary + 1).join("\n"),
+    rest,
+    firstContent,
+  );
 }
 
 /**
@@ -870,11 +884,11 @@ export function splitAtSettledBlock(withheld: string): MarkdownSplit | null {
     const rest = lines.slice(boundary + 1);
     const firstContent = rest.findIndex((entry) => entry.trim().length > 0);
     if (firstContent === -1) continue;
-    return {
-      frozen: lines.slice(0, boundary + 1).join("\n"),
-      live: rest.slice(firstContent).join("\n"),
-      gapRows: firstContent > 0 ? 1 : 0,
-    };
+    return settledSplit(
+      lines.slice(0, boundary + 1).join("\n"),
+      rest,
+      firstContent,
+    );
   }
   return null;
 }

src/tui/notice-line.test.ts

@@ -8,7 +8,6 @@ import {
 
 const state = (over: Partial<NoticeState> = {}): NoticeState => ({
   waitingOn: null,
-  interrupt: false,
   pinned: false,
   flash: null,
   attachments: 0,

src/tui/notice-line.ts

@@ -25,7 +25,6 @@ export interface NoticeState {
    * Gated by `resolveWaitingOn`; this field only controls wording.
    */
   readonly waitingOn: string | null;
-  readonly interrupt: boolean;
   /** Transcript scrolled off the tail (non-default follow state). */
   readonly pinned: boolean;
   /** Transient feedback (copy result, attach failure, exit arming). */

src/tui/shell/chrome.ts

@@ -136,7 +136,6 @@ export function noticeText(shell: AppShell): string {
       shell.inFlightTool,
       shell.lockupNowMs,
     ),
-    interrupt: shell.session.interruptFlash,
     pinned: !isTranscriptFollowing(shell),
     flash: shell.statusFlash,
     attachments: shell.pendingAttachments.length,

src/tui/tool-formatter.ts

@@ -147,8 +147,8 @@ export function describeToolCall(
       const subject = description.length > 0 ? description : prompt;
       const first = agentName?.[0];
       const display =
-        first != null && agentName !== undefined
-          ? first.toUpperCase() + agentName.slice(1)
+        first != null
+          ? first.toUpperCase() + (agentName ?? "").slice(1)
           : "Worker";
       // Collapsed row uses the abbreviated subject; Alt+E expands to the full text.
       return {