Widgets, app shortcuts, and notification actions #41

Part of #52 (Post-v1 upgrade track). Post-v1, not scheduled — do not start before the owning v1 workstream ships unless the epic reprioritizes it.

Outcome

Home-screen widgets (e.g. transfers/recent), app shortcuts, and notification actions that deep-link into the v1 routes.

Acceptance criteria

• DoD: verify green; screenshots of widgets/shortcuts and a recording of notification actions attached