feat(sidebar): show update time instead of creation time

[abdulbari149]

What Changed

• Thread type (types.ts): Added updatedAt to the Thread interface.
• Store (store.ts): In syncServerReadModel, pass thread.updatedAt from the server read model into client state.
• Sidebar (Sidebar.tsx): Use thread.updatedAt ?? thread.createdAt for the timestamp label and for sorting threads.
• Sidebar.logic (Sidebar.logic.ts): Added compareThreadsByLastActivity and ThreadSortInput for sorting threads by last activity.
• Tests: Updated store.test.ts, worktreeCleanup.test.ts, and ChatView.logic.ts to include updatedAt. Added tests for compareThreadsByLastActivity in Sidebar.logic.test.ts.

Why

The sidebar previously showed the thread creation time instead of the last activity time. Users expect threads to be ordered by when they were last used.
The server already maintains thread.updatedAt and updates it on messages, turns, and session changes. This change surfaces that field on the client and uses it for display and sorting.

UI Changes

Before: Sidebar showed creation time (e.g. "4d ago"). Threads were ordered by creation time.

After: Sidebar shows last activity time (e.g. "5m ago"). Threads are ordered by last activity (most recent first).

Checklist

• This PR is small and focused
• I explained what changed and why
• I included before/after screenshots for any UI changes
• I included a video for animation/interaction changes

Note

Show last update time instead of creation time in sidebar thread list

• Adds updatedAt to the Thread interface and maps it from the server read model in store.ts.
• Introduces compareThreadsByLastActivity in Sidebar.logic.ts to sort threads by updatedAt (falling back to createdAt), with id as a tiebreaker.
• Updates the sidebar thread list and focusMostRecentThreadForProject to use the new comparator and display updatedAt when available.
• Behavioral Change: thread sort order and focused thread on project switch may change for threads that have been updated after creation.

^{Macroscope summarized fcd6d06.}

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