fix: don't just show the creation time for threads in sidebar

[nmggithub]

What Changed

Should resolve #973. This updates the date indicator for threads as the thread itself updates. We can decided which dates we actually want to use as the canonical reference points.

EDIT: Changed strategies to use the last chat message's createdAt. Macroscope's summary below is out-of-date.

Why

Users expect the date indicator to change as they interact with the thread.

UI Changes

Before (main) and after (`sidebar-dates', my branch) on a thread I just got a response from:

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

Sort sidebar threads and relative timestamps by last message time instead of creation time

Threads in the sidebar were always sorted and labeled by their creation time. They are now sorted and labeled by the time of the last message, falling back to creation time when no messages exist.

• Updates the per-project sort comparator in Sidebar.tsx to use the last message's createdAt when available.
• Updates the focusMostRecentThreadForProject hook to use the same logic when selecting which thread to focus.
• Behavioral Change: thread order in the sidebar and displayed relative timestamps will change for any thread that has received messages after creation.

^{Macroscope summarized 85bb9a0.}

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[jamesx0416]

@binbandit quick win here, 3 commits(with mine) would close #804, #973, #466, and is simpler(10 line change) than #1030, #1089, #827, and #741.