**Is your feature request related to a problem? Please describe.** Currently, when CDN templates are unavailable, the extension silently falls back to backup templates without notifying users. This means users may unknowingly use older templates instead of the latest ones, potentially missing new features or improvements. **Describe the solution you'd like** Add user notification when template fallback occurs, similar to: - Toast notification: "Unable to fetch latest templates from CDN, using backup templates" - Option to retry fetching from CDN - Clear indication in the template selection UI when backup templates are being used **Describe alternatives you've considered** - Log-only notification (not visible enough) - Blocking behavior that prevents template usage (too disruptive) - Configuration option to disable fallback (doesn't solve transparency issue) **Additional context** - Template fallback happens silently in the current implementation - Backup templates are updated every couple months vs CDN templates which are updated regularly - Users should be aware they're not getting the latest templates - Related to template loading in `src/templates/` directory **Implementation considerations** - Should integrate with existing `CentralTemplateProvider` logic - Notification should be non-blocking but visible - Consider adding telemetry for fallback occurrences - May need update to backup template update frequency documentation