Backlog: Siri on-screen awareness (View Annotations + StationEntity) P2

BACKLOG.md

@@ -30,6 +30,18 @@ Status: TODO / IN PROGRESS / DONE / BLOCKED.
   automations ("get cheapest diesel → notify").
 - [ ] **Siri: favourite station price** — "What's diesel at my favourite station?"
   (cheap once `StationEntity` exists).
+- [ ] **Siri: on-screen awareness (View Annotations + StationEntity)** — iOS
+  26/27 Siri prefers the visible screen over the App Shortcut when the app is
+  frontmost; without view annotations it answers from the rendered screen
+  (unstructured "screenshot" parse) — visible tab/sort/radius, not the full
+  dataset or the intent's logic. Fix: `StationEntity` (shared with the station
+  lookup P2 above) + `.appEntityIdentifier` on station rows (collection
+  annotation on the List) + `NSUserActivity` on the station detail/map +
+  App Schema conformance (optional `IndexedEntity` for Spotlight semantic
+  search). Verify annotations with AppIntentsTesting (P3). Off-screen/locked
+  requests already route to `CheapestFuelIntent` correctly; this closes the
+  frontmost gap. WWDC26: "Build intelligent Siri experiences with App Schemas"
+  + "Explore advanced App Intents features".
 - [ ] **Lock screen widgets** — new `FuelPriceLockScreen` kind (fuel-only config
   intent, reuses `FuelPriceTimelineProvider`): `accessoryRectangular` (cheapest
   station + price + distance), `accessoryCircular` (price ring), `accessoryInline`