feat(app): isolate Work-side tab lists per mounted folder

CHANGELOG.md

@@ -9,6 +9,22 @@ file is the human-readable summary of what changed and why.
 
 ### Desktop / Web UI
 
+- **Each folder in a sandbox now has its own session tabs** — a sandbox can
+  mount several folders, but all of their sessions shared one tab strip on the
+  **Work** side, so working in two folders meant reading past the other one's
+  tabs. Every folder of every sandbox now keeps its own tabs, including the
+  project folder the sandbox was created with. Clicking a folder in the sidebar
+  takes you back to the session you were last in there — or to that folder's
+  draft, or to one of its open tabs, and only to a fresh new session when the
+  folder has nothing open at all. Tab shortcuts (`Ctrl`/`Cmd` +
+  number, next/previous tab, close tab) act within the folder you are looking
+  at, so closing the last tab in a folder no longer drops you into an unrelated
+  one. Two folders that happen to have the same name stay separate, and so does
+  the same folder mounted into two different sandboxes. **The Work strip now
+  shows one sandbox at a time**: while you are in one sandbox's folder, another
+  sandbox's tabs are not in the strip — selecting that sandbox brings them back.
+  Existing tabs keep their place; anything the app cannot immediately match to a
+  folder stays visible in that sandbox until it can. Code is unchanged.
 - **Adding a folder to a sandbox no longer freezes the app** — mounting a new
   folder on a sandbox you had a session open on locked the window up entirely:
   no clicks, no typing, force quit the only way out. Applying a mount restarts

DIVERGENCES.md

@@ -202,6 +202,8 @@ from the squash message first, or use a plain merge.
 
 | Desktop identity: `packages/desktop/src/main/{index,store}.ts`, `packages/desktop/electron-builder.config{,.test}.ts`, `packages/desktop/scripts/copy-metainfo.ts`, `packages/desktop/resources/linux/opencode-desktop.desktop` (deleted), `packages/app/src/pages/layout/{deep-links.ts,helpers.test.ts}`, `packages/codev-brand/test/brand.test.ts` | appId `ai.opencode.desktop{,.beta,.dev}` → `ai.codev.desktop{,.beta,.dev}` (both copies: `APP_IDS` in main and in the builder config, plus the unpackaged fallback); deep-link scheme `opencode://` → `codev://` in all three places that must agree — `protocols.schemes`, `app.setAsDefaultProtocolClient`, and the renderer's `parseUrl` — plus the `argv.startsWith` filter the second-instance handler uses; `rpm.packageName` `opencode`/`opencode-beta`/`opencode-dev` → `codev`/`codev-beta`/`codev-dev`; the hidden `opencode-desktop.desktop` legacy launcher and its `deb`/`rpm` fpm wiring deleted. `src/main/migrate.ts` keeps the old ids — they name the *Tauri* app's directories, not ours. | The appId is the whole desktop identity: `app.setPath("userData", join(appData, appId))`, so it also names the data directory, and it drives the macOS bundle id, the Windows AppUserModelId and NSIS keys, the Linux `.desktop` filename, `executableName` and `StartupWMClass`, and the AppStream metainfo id. Leaving it as opencode meant the fork's app identified itself as upstream to the OS. Renamed as a clean cut with no data migration and no back-compat shim, on the explicit basis that there is no installed base: existing profiles under `appData/ai.opencode.desktop*` are simply orphaned (settings, session history, sandboxes and the downloaded guest image), and a packaged update across the rename would install beside the old app rather than replace it. The legacy launcher went with it — it existed to rescue GNOME/KDE pins from a superseded packaging id, and its `Exec=/opt/OpenCode/...` no longer matched any install layout. | Keep our ids and scheme; take upstream's other config. Never rename the `TAURI_APP_IDS` in `migrate.ts` to match — a blind find-and-replace there points the Tauri migration at a directory that never existed. All three deep-link sites have to move together or links open nothing; `electron-builder.config.test.ts` covers the ids, the package names and the scheme per channel. |
 
+| Code/Work workspace split: `packages/app/src/context/layout.tsx`, `packages/app/src/components/{app-sidebar,titlebar}.tsx`, `packages/app/src/i18n/{en,es}.ts` | The sidebar gains two tabs above Projects — **Code** (every non-sandbox server: the local sidecar, WSL, remote, SSH) and **Work** (the sandboxes) — backed by the fork-only `packages/app/src/workspace/{side.ts,tabs.tsx}`. `layout.tsx` stores `home.workspace` and `home.lastSession` (per side) and records the latter from an effect on `route()`; `app-sidebar.tsx` renders `<WorkspaceTabs/>`, swaps `global.servers.list()` for a side-filtered memo in all six places it indexed it, and adds an empty-state branch because a side can now have no servers at all; `titlebar.tsx` loses the Home button and its `home.toggle` command (`mod+b`) and filters the tab strip, its reorder and `tab.prev`/`tab.next` to the visible side; `effectiveSide` falls back to Code only where the platform has no sandbox support — deliberately not on an empty sandbox list, which is indistinguishable from one that has not loaded; `layout.tsx` also holds an effect keeping `home.selection.server` on the showing side, because a sandbox joins the server list only once it has finished starting, so the one-shot correction inside a switch cannot cover a sandbox created moments earlier; the fork-only `DialogAddSandbox` gains an `onCreated` callback so the Work gate switches on the create's own result rather than on the asynchronous sandbox list; `dialog-select-server.tsx` `handleRemove` calls `workspace.removedServer(key)` beside the tab cleanup, which steps back to Code when the sandbox being deleted is the last one; i18n gains `workspace.{code,work,empty.none,empty.starting}`. | Sandboxes were just another row in a list of servers, so the isolated environment and the local machine were one undifferentiated pile. Splitting them makes "am I running on my machine or in a sandbox?" a property of where you are rather than something to infer from a server name. The Home button went because it opened a draft rather than a home screen, which is the behaviour the tabs replace: a tab returns you to that side's last session, falling back to a draft and then to the home screen. All the logic lives in the fork-only module; the upstream files hold wiring only, and every section below the tabs is the same component reading a filtered list. | Keep the wiring and take upstream's surrounding changes. The six `sideServers()` call sites in `app-sidebar.tsx` were `global.servers.list()` — if upstream adds a seventh, filter it too or that branch will show sandboxes under Code. Read `useWorkspaceSide()` rather than `layout.home.workspace()`: it collapses to Code where the platform has no sandbox support, which is what keeps the web build coherent. The tab strip filter and `reorderWithinSide` go together — `tabs.reorder()` rejects a partial key list, so a filtered strip without the merge silently ignores drags. |
+| Per-folder Work tab strip: `packages/app/src/context/{layout,tabs}.tsx`, `packages/app/src/components/titlebar.tsx`, `packages/app/src/pages/home.tsx` | Extends the Code/Work split row above so the Work side keeps one tab strip per **mounted folder** of a sandbox rather than one for the whole side. A sandbox exposes its project folder plus every extra mount as its own project (fork-only `src/sandbox/projects.ts`), so the strip is keyed by (sandbox, folder). All of the logic is in the fork-only `src/workspace/side.ts` (`TabScope`, `folderForDirectory`, `tabsForScope`, `reorderWithinScope` — `tabsForSide`/`reorderWithinSide` become thin wrappers over the same primitives so the Code path is provably unchanged) and `src/workspace/tabs.tsx` (`useWorkspaceScope`, `useWorkspaceFolder`). Upstream files hold wiring only: `tabs.tsx` adds `SessionTab.directory` — deliberately **not** part of `tabKey()`, which is what keeps every persisted `info`/`memory`/`closed` key valid as the field appears — plus `backfillTabDirectories` and the effect that applies it, `promoteDraft` inheriting the draft's directory, `addSessionTab` filling a missing directory on an already-open tab, and an optional `within` on `closeTab`/`removeTab` so the successor after a close is picked from the visible list; `layout.tsx` adds `home.lastFolderSession` (keyed `` `${server}\n${pathKey(directory)}` ``) with `folderSession`/`recordFolderSession`; `titlebar.tsx` swaps the side filter for the scope in the strip, reorder, `tab.prev`/`tab.next` and `tab.close`, passes `session.directory` to `addSessionTab`, and gains a leading scope branch in `openNewTab`; `home.tsx` passes `directory` to `addSessionTab`. `pages/home-model.tsx` (fork-only) selects instead of toggling on Work and calls `enterFolder`. The scope is **derived**, never stored: the folder on screen wins, then the sidebar's selected project, then the sandbox's primary folder from `sync.data.path.directory` — so deep links, the command palette and a reopened tab all pull the strip to their own folder instead of leaving the active tab out of view. `pages/session.tsx` and `components/command-palette.ts` are deliberately left untouched; their tabs pick up a folder through the back-fill instead, which keeps two more upstream files out of this table. | Sandboxes gained extra folder mounts, so one sandbox can expose several unrelated folders while their sessions shared a single strip — working across two folders meant constantly reading past the other one's tabs. Deriving the scope rather than persisting a "current folder" makes "the strip always contains the session you are looking at" true by construction instead of by an effect racing the two `home` effects in `layout.tsx`, and it keeps the sidebar's Recents unnarrowed: writing the route's folder into `home.selection.directory` would feed `projectDirectories()` and silently filter that list too. | Keep the wiring and take upstream's surrounding changes. `tabsForScope` must return the store's own tab objects — the strip compares by reference for the active highlight, the close index and the `<For>` key, so never map to copies. Never add `directory` to `tabKey()`. A tab whose folder cannot be resolved shows in **every** folder of its own sandbox on purpose: it is exactly the tab that has never rendered and so never had a chance to learn where it belongs, and being invisible everywhere is unrecoverable. `folderForDirectory`'s prefix test must stay path-boundary aware — mount guest names dedup with a `-2` suffix, so `/mnt/shared` must not swallow `/mnt/shared-2`. Resolve the primary folder from `sync.data.path`, never `projects.list()[0]`: `projects.open()` prepends, so that is the most recently added mount. |
 | Code/Work workspace split: `packages/app/src/context/layout.tsx`, `packages/app/src/components/{app-sidebar,titlebar}.tsx`, `packages/app/src/i18n/{en,es}.ts` | The sidebar gains two tabs above Projects — **Code** (every non-sandbox server: the local sidecar, WSL, remote, SSH) and **Work** (the sandboxes) — backed by the fork-only `packages/app/src/workspace/{side.ts,tabs.tsx}`. `layout.tsx` stores `home.workspace` and `home.lastSession` (per side) and records the latter from an effect on `route()`; `app-sidebar.tsx` renders `<WorkspaceTabs/>`, swaps `global.servers.list()` for a side-filtered memo in all six places it indexed it, and adds an empty-state branch because a side can now have no servers at all; `titlebar.tsx` loses the Home button and its `home.toggle` command (`mod+b`) and filters the tab strip, its reorder and `tab.prev`/`tab.next` to the visible side; `effectiveSide` falls back to Code only where the platform has no sandbox support — deliberately not on an empty sandbox list, which is indistinguishable from one that has not loaded; `layout.tsx` also holds an effect keeping `home.selection.server` on the showing side, because a sandbox joins the server list only once it has finished starting, so the one-shot correction inside a switch cannot cover a sandbox created moments earlier; the fork-only `DialogAddSandbox` gains an `onCreated` callback so the Work gate switches on the create's own result rather than on the asynchronous sandbox list; `dialog-select-server.tsx` `handleRemove` calls `workspace.removedServer(key)` beside the tab cleanup, which steps back to Code when the sandbox being deleted is the last one; i18n gains `workspace.{code,work,empty.none,empty.starting,empty.stopped}` (the last for a Work side whose sandboxes are all stopped, which unlike starting or failed will never come up on its own). | Sandboxes were just another row in a list of servers, so the isolated environment and the local machine were one undifferentiated pile. Splitting them makes "am I running on my machine or in a sandbox?" a property of where you are rather than something to infer from a server name. The Home button went because it opened a draft rather than a home screen, which is the behaviour the tabs replace: a tab returns you to that side's last session, falling back to a draft and then to the home screen. All the logic lives in the fork-only module; the upstream files hold wiring only, and every section below the tabs is the same component reading a filtered list. | Keep the wiring and take upstream's surrounding changes. The six `sideServers()` call sites in `app-sidebar.tsx` were `global.servers.list()` — if upstream adds a seventh, filter it too or that branch will show sandboxes under Code. Read `useWorkspaceSide()` rather than `layout.home.workspace()`: it collapses to Code where the platform has no sandbox support, which is what keeps the web build coherent. The tab strip filter and `reorderWithinSide` go together — `tabs.reorder()` rejects a partial key list, so a filtered strip without the merge silently ignores drags. |
 
 | `packages/app/src/context/global.tsx` | Two lines: imports `seedSandboxProjects` from the fork-only `packages/app/src/sandbox/projects.ts` and calls it with `server.list` + `ensureServerCtx`, beside the memo that already creates a ctx per connection. All the logic lives in the fork-only module. | A sandbox exposes exactly one directory (`/workspace` on vz/bwrap, the wslpath translation on WSL) and the guest registers it as its own project, but the app's per-server project list starts empty and nothing ever fills it. With no project, every "New session" entry point — `home-model.openNewSession`, the titlebar's `openNewTab` fallback chain — finds nothing for that server and falls back to another one, so the sandbox looks selected while the session runs on the local server. The seed reads `sync.data.path.directory`, which every server ctx already fetches, so it stays backend-agnostic. The same module also names that project after the sandbox's host folder (via `client.project.update`, the call behind rename-project), because the guest sees only its mount point and every sandbox would otherwise read "workspace" in the sidebar, tabs and palette. | Keep both lines; take upstream's other changes to the file. The call must stay inside the Global context init (it needs `ensureServerCtx`) — `SandboxesProvider` is mounted above `GlobalProvider` in `app.tsx`, so it cannot live there. |