Make keyring optional behind keyring-storage feature in onyx-core.
Make notify/notify-debouncer-mini optional behind desktop feature in Tauri.
Gate all file watcher code behind #[cfg(not(target_os = "android"))].
Provide env-var-only credential fallbacks when keyring is disabled.
Replace the hours==0 && minutes==0 heuristic with an explicit has_time
bool field on Task. Existing files without the field deserialize as false
(date-only), preserving current behavior. Frontend components pass and
receive has_time through DateTimePicker's onchange callback.
Add TaskRepository::move_task() to move tasks between lists and
rename_list() to rename lists on the filesystem. Adds rename_list
to the Storage trait with FileSystemStorage implementation.
Includes tests for both operations plus duplicate-name error case.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>