- Adds syncAllMutation calling trpc.syncAllProjects once for all cards
- Shows Sync All button in header when ≥1 project exists (hidden otherwise)
- Propagates isPending to ProjectCard.syncAllPending to disable per-card sync
- On success: toasts all-success or failure count; invalidates listProjects + getProjectSyncStatus per project
- On network error: toasts Sync failed with err.message
- Adds unit tests for ProjectSyncManager.syncAllProjects: empty list, all succeed, partial failure, result shape, and failure counting logic
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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