What changed

Adds a Quick Settings tile that cycles AirPods noise control modes (Off / Transparency / Adaptive / Noise Cancellation) right from the system swipe-down panel — no need to open the app.

The tile auto-targets the user's primary device (system-connected first, then most recently seen). Each tap advances to the next available mode; rapid taps coalesce into a single command 1 s after the last tap, so the AirPods don't choke on a burst.

Pro-required, Bluetooth-off, no-device, and connecting states are surfaced honestly — the tile never claims to be ready when it isn't.

Technical Context

• State holder is process-scoped (@Singleton AncTileStateStore) instead of per-TileService-instance: services are destroyed between panel sessions, so per-instance state forced the first tap of each session to await a hot flow emission — that produced a perceptible 500 ms hang on every panel reopen.
• Send coordinator is also @Singleton with per-address debounced Jobs. Without process-scoped coalescing, taps across consecutive panel sessions each fired their own SetAncMode, overwhelming AAP verification and triggering "Rejected after retry" cascades that left the device unresponsive until app restart.
• Optimistic UI overlay: the device echoes ANC changes back through AAP → BLE → DeviceMonitor, a multi-hundred-ms round trip. Without an overlay, the icon doesn't move until the echo arrives and cycling feels laggy. Pipeline is split — applyPendingTarget is pure (read-only overlay), acknowledgeDeviceState is the side-effecting clear, called from a dedicated collector.
• 5 s safety timeout in the coordinator covers the rare case where AAP never propagates the in-flight pendingAncMode (e.g. socket dropped before the debounced send fires) — otherwise a failed send would freeze the optimistic overlay.
• Reuses device.visibleAncModes so the tile honours "Allow Off" + Listening Mode Cycle the same way the home-screen widget does, no separate filtering logic.
• PodDeviceTier extracted so tile and overview agree on "primary device" via a single comparator.

Closes #573