Make notifications for new tasks configurable

[ariyadey]

Description:

Currently, a desktop notification is always shown when a new task is successfully added via the quick-add dialog. This provides useful feedback, but some users may find it intrusive. This issue proposes adding a configuration option to allow users to enable or disable these notifications.

Proposed Changes

1. Add a Setting for Notifications:

   • Introduce a new persistent setting, showNotifications, to store the user's preference.
   • The setting should default to true (enabled).

2. Add a UI Toggle in the Tray Menu:

   • Add a new checkable menu item, "Show notifications", to the system tray menu.
   • The checked state of this item should reflect the current value of the showNotifications setting.
   • Toggling the menu item should update the setting and persist the change.

3. Conditionally Send Notifications:

   • The frontend logic in the QuickAddDialog should check the showNotifications setting before attempting to send a notification.
   • Notifications for both successful and failed task additions should respect this setting.

Implementation Plan

Backend (src-tauri)

1. src-tauri/src/desktop/tray.rs:

   • Add a new ToggleNotifications variant to the MenuId enum.
   • In get_tray_menu, add a CheckMenuItem for "Show notifications". Its initial state should be loaded from the new setting.
   • In handle_menu_event, add a case for ToggleNotifications that updates the setting and the menu item's checked state.

2. src-tauri/src/ipc/commands.rs:

   • Expose a new command get_show_notifications() -> bool that retrieves the current setting value.
   • Expose a new command set_show_notifications(enabled: bool) that updates the setting.

3. src-tauri/src/shared/storage/general.rs:

   • Utilize the existing set and find functions in this module to manage the showNotifications setting.
   • A new StorageKey variant, ShowNotifications, will need to be added to src-tauri/src/shared/storage/key.rs.

Frontend (src/app)

1. src/app/quick-add/quick-add-dialog.ts:
   • On initialization, fetch the showNotifications setting using the new get_show_notifications command.
   • In the onSubmit method, check the value of this setting before calling this.notification.send().