fix(web): retain terminal PR badges after checkout switch

[sebbonit]

What Changed

Fixes #4752.

Sidebar V2 now keeps a parent-level PR snapshot (branch, full PR object, provider) instead of only "open" | "merged" | "closed".

• Snapshots update only when live VCS status matches the thread branch.
• Branch mismatch / missing VCS data leaves the snapshot alone.
• Display and settlement both use one resolver: live PR on match; cached merged/closed PR on mismatch.
• Open PRs are not retained across a checkout switch.

Why

After a local-checkout thread’s PR was observed as merged/closed, switching the shared checkout to main made resolveThreadPr return null (branch mismatch). That cleared the parent map, unssettled the thread, and dropped the PR badge. Retaining the previously verified terminal PR at the Sidebar V2 parent is enough; no contracts/server changes.

UI Changes

Settled local-checkout rows keep their PR number, link, title, provider terminology, and terminal color after switching away from the thread branch. No layout changes.

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

Retain terminal PR badges in sidebar and chat view after checkout switch

• Adds threadChangeRequestSnapshotsAtom to persist per-thread PR snapshots (branch, PR state, provider) in memory across component unmounts.
• Introduces resolveDisplayedThreadPr and resolveDisplayedThreadPrProvider to fall back to a cached merged/closed PR snapshot when the active checkout branch no longer matches the thread branch, but only for local (non-worktree) checkouts.
• Updates SidebarV2Row and ChatViewContent to use the new resolver and snapshot atom, so thread settlement classification (settled vs inbox) correctly accounts for retained terminal PRs.
• Worktree threads clear their snapshot on branch mismatch rather than retaining it.
• Behavioral Change: sidebar thread partitioning now considers cached PR state for local threads, which may change how threads are classified after a checkout switch.

^{Macroscope summarized 703413f.}

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Note

Medium Risk
Touches sidebar partitioning, chat settlement UI, and shared atom state; behavior is well-covered by tests but incorrect retention could mis-label PR status or settled rows.

Overview
Fixes sidebar and chat losing merged/closed PR badges and auto-settlement when a local-checkout thread’s shared git checkout moves off the thread branch (e.g. to main).

Sidebar V2 and ChatView now share a parent-level threadChangeRequestSnapshotsAtom (branch, full PR, provider) instead of bubbling only PR state. Rows update snapshots via nextThreadChangeRequestSnapshot only on authoritative VCS when the live ref matches the thread branch; branch mismatch or missing VCS no longer clears a verified terminal snapshot for local threads (worktreePath === null). resolveDisplayedThreadPr / resolveDisplayedThreadPrProvider drive badges and effectiveSettled the same way in the sidebar partition and chat banner. Open PRs are never shown or retained across mismatch; worktree threads clear snapshots on branch mismatch.

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[macroscopeapp]

Approvability

Verdict: Approved

This is a self-contained UI bug fix that caches terminal PR badge states (merged/closed) so they persist when users switch branches. The majority of the additions are comprehensive unit tests. No security, auth, or billing implications.

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Cursor Bugbot has reviewed your changes using high effort and found 1 potential issue.

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