fix: restore Changes focus on task return (#2091)

docs/specs/ui/task-layout-profiles.md

@@ -22,8 +22,9 @@ Users can arrange and save the desktop task workbench only while a task is open,
 - Removing Terminal from the effective default prevents the default terminal panel and its backing user shell from being created when a fresh task environment is first opened.
 - Applying a layout preserves every configured reusable panel regardless of whether the task has repositories. Panels without applicable content remain available and show their normal empty state.
 - A changed default applies to task environments that have no saved task-specific layout and to an explicit Reset Layout action. It does not overwrite an existing task-specific layout merely because the setting changed.
+- Returning to a desktop task restores its task-specific layout, then activates Changes when a meaningful Git or commit update was detected while that task was inactive. This pending-change attention overrides the saved active panel, but an ordinary reload with already-known changes preserves the saved active panel.
 - Switching between tasks whose sessions share one task environment atomically replaces task-owned Agent tabs in their existing group. The handoff preserves the live split tree and proportions instead of briefly emptying the group or rebuilding the environment layout.
-- Desktop Agent-tab reconciliation preserves both the selected tab in each existing group and the globally focused panel. Replacing a selected Chat placeholder with the active session keeps Agent selected in that group without transiently selecting a neighboring Plan tab, while focus in another group such as Files or Changes remains unchanged. A valid non-Agent tab that was already selected in the Agent group remains selected.
+- Desktop Agent-tab reconciliation preserves both the selected tab in each existing group and the globally focused panel unless pending inactive-task changes deliberately activate Changes. Replacing a selected Chat placeholder with the active session keeps Agent selected in that group without transiently selecting a neighboring Plan tab, while focus in another group such as Files or Changes remains unchanged. A valid non-Agent tab that was already selected in the Agent group remains selected.
 - The existing workbench layout menu continues to apply built-in and custom profiles and save the current workbench as a custom profile. Profile mutations from either surface remain consistent after the user-settings response is received.
 - Layout-profile editing is usable with pointer, keyboard, and touch input. On narrow settings viewports, profile management and all editor commands remain reachable without horizontal page scrolling.
 - Layout profiles configure the desktop Dockview workbench only. Mobile and tablet task-detail layouts retain their existing behavior.
@@ -86,7 +87,9 @@ The frontend treats the returned settings payload as authoritative after each su
 - **GIVEN** a customized built-in layout, **WHEN** the user selects that built-in from the task workbench layout menu, **THEN** the saved override is applied instead of the original code-defined template.
 - **GIVEN** a valid custom profile, **WHEN** the user reorders tabs or moves a panel into a new split and saves, **THEN** reopening the profile shows the same tab order, active tab, split order, and proportions.
 - **GIVEN** a default profile without Terminal and a task environment with no saved layout, **WHEN** the user first opens that task, **THEN** the workbench has no Terminal tab and no default user shell is created.
-- **GIVEN** an existing task with a task-specific layout, **WHEN** the user changes the default profile and returns to that task, **THEN** the task-specific layout is unchanged.
+- **GIVEN** an existing task with a task-specific layout and no pending inactive-task changes, **WHEN** the user changes the default profile and returns to that task, **THEN** the task-specific layout and saved active panel are unchanged.
+- **GIVEN** an existing desktop task with a saved active panel and a Changes panel outside the Agent group, **WHEN** a meaningful Git or commit update is detected while the task is inactive and the user returns to it, **THEN** the task-specific geometry is restored and Changes becomes the active panel after restoration completes.
+- **GIVEN** an existing desktop task with already-known changes and a saved active panel, **WHEN** the user reloads that task without a new Git or commit update, **THEN** the saved active panel remains active.
 - **GIVEN** an existing task with a task-specific layout, **WHEN** the user chooses Reset Layout, **THEN** the latest effective default profile replaces that task's layout.
 - **GIVEN** two tasks whose active sessions share one task environment and a desktop workbench with Agent in the center and Files or Changes above Terminal on the right, **WHEN** the user switches between those tasks, **THEN** the incoming Agent replaces the outgoing Agent in the same group, the right column remains vertically split, the root remains horizontally split, and the same geometry survives reload.
 - **GIVEN** a normal desktop task layout restore completes while the active session's Agent panel is absent, **WHEN** the center group is empty, **THEN** the Agent panel is restored into that group and activated before the workbench is shown; when Plan or another valid saved center tab is active, restoring Agent does not steal focus from it, and a deliberately maximized non-Agent group remains unchanged.
@@ -101,6 +104,7 @@ The frontend treats the returned settings payload as authoritative after each su
 ## Out of scope
 
 - Customizing mobile or tablet task-detail layouts.
+- Auto-activating Changes merely because a task has an already-known non-zero change count.
 - Changing the global app sidebar width or other layout-profile split proportions.
 - Forcing a changed default onto existing task-specific layouts without Reset Layout.
 - Configuring task-specific panels such as individual files, diffs, commits, pull requests, extra sessions, or extra terminals.