Add user-configurable timezone and 12/24-hour preferences, then wire them through settings, runtime snapshots, scheduler payloads, wait handling, notifications, backups, memory, plugin metadata, and frontend formatters.
Keep UTC as the boundary for absolute instants while serializing user-facing dates in the configured or browser-resolved timezone. Preserve scheduler wall-clock inputs in the selected timezone, propagate TZ into desktop/runtime process environments, and restart active desktop sessions when the runtime timezone changes.
Cover the risky paths with timezone regression tests for settings normalization, auto and fixed timezone resolution, scheduler round-trips, memory timestamp conversion, and desktop timezone sync.
Allow display_time=0 to create persistent grouped toasts that remain until dismissed or replaced.
Show immediate grouped Preparing download and Downloading feedback for backup ZIPs and file-browser directory/bulk ZIP downloads, with error replacement and focused static coverage.
Introduce validate_tool_request() extensible method in agent.py to validate tool request structure (dict with tool_name string and tool_args dict fields) before processing. Add after_plugin_change() helper in helpers/plugins.py that clears cache and sends a frontend reload notification (throttled to display_time interval) with a reload button. Update plugin installer install/delete flows to call after_plugin_change(). Extend notification
