fix(web): scope PR actions to thread branch

[binbandit]

Summary

• scope header and sidebar PR metadata to the active thread branch
• strip repo-level PR state from branchless new threads so View PR is not shown prematurely
• add focused tests for branchless and mismatched thread git state

Why

A new thread can start with branch: null, but the header git controls were reading repo-level git status directly. If the repo's current branch had an open PR, the new thread incorrectly showed View PR for that unrelated PR.

Validation

• bun run test src/lib/threadGitStatus.test.ts src/components/GitActionsControl.logic.test.ts
• bun fmt
• bun lint
• bun typecheck

Note

Scope PR actions and quick actions to a thread's pinned branch

• Adds resolveThreadScopedGitStatus and resolveThreadScopedPr utilities in threadGitStatus.ts to filter GitStatusResult based on a thread's branch binding.
• GitActionsControl now computes a thread-scoped git status and disables quick actions with a descriptive message when the active thread is pinned to a different branch than the current git branch.
• Sidebar replaces inline branch-match logic with resolveThreadScopedPr to correctly map thread IDs to PRs.
• Branchless threads have PR metadata stripped before action resolution.
• Behavioral Change: PR actions and menu items now resolve from the thread's branch rather than the global git status; threads on mismatched branches see disabled actions instead of potentially incorrect ones.

^{Macroscope summarized 92c1aab.}

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[nmggithub]

Does this affect the UI as well? I've had issues in the past with the app where I change branches and the PR icon next to (a) thread(s) seems to appear and disappear almost out-of-sync with the branch status.