Reconcile the cached is_git_repo flag against the filesystem on every watch flush so `git init` or deletion of .git is reflected immediately: sync the stored flag, drop stale git_snapshot data when the repo goes away, emit a meta delta when presence flips without any data change, and mark the event as requires_resync so the frontend re-fetches the snapshot to pick up the new flag.
Replace the title-bar branch polling interval with a self-adjusting setTimeout chain that backs off to 60s when get_git_branch returns null or throws and drops back to 10s once a branch is detected, so branches created externally recover within one slow tick without hammering the backend on non-git folders.
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