🤖 Preserve git status on timeout/failure

[ammar-agent]

Problem

When git status checks fail (timeout, parse error, network issues), the store was clearing the cached status and setting it to null. This caused the git indicators in the UI to disappear during transient failures, creating visual flicker and losing useful information.

Before:

timeout → status cleared → indicator disappears → next poll → indicator reappears

After:

timeout → old status preserved → indicator remains stable

Solution

Only update statusCache when the new status check succeeds (non-null). On failure:

• Keep the old cached status
• Don't bump the version (no re-render)
• Silent degradation - stale data is better than no data

if (!this.areStatusesEqual(oldStatus, newStatus)) {
  if (newStatus !== null) {  // ✅ Only update on success
    this.statusCache.set(workspaceId, newStatus);
    this.statuses.bump(workspaceId);
  }
  // On failure: keep old status, don't bump
}

Scenarios This Helps

1. Slow network/disk - 5 second timeout may be too aggressive for large repos with remote on slow connection
2. Transient failures - Network hiccup, disk busy (antivirus, backup), workspace temporarily unmounted
3. Repository issues - Corruption, remote unreachable (better to show last known state than hide indicator)

Testing

Added unit tests to verify:

• Old status is preserved when checkWorkspaceStatus returns null
• Status updates normally when checks succeed after previous failures
• No re-renders occur when status check fails (listeners not called)

All 489 tests pass.

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