Replaces the static sync icon with a live status widget:
- Spinner (CircularProgressIndicator) while a sync cycle is active
- Red sync_problem icon when the last sync recorded an error
- Regular sync icon when idle (tapping still triggers a manual sync)
AccountSyncManager now exposes watchSyncing(accountId) — a broadcast
stream that emits true/false as each sync loop starts and ends.
The isSyncingProvider in di.dart bridges this to Riverpod.
Thomas SharedInbox
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