feat(native): add iOS home screen widgets for continue watching and upcoming

- Add `ContinueWatching` (systemSmall) and `Upcoming` (systemSmall) SwiftUI widgets via `expo-widgets`, registered in `app.json` under the `group.com.jakejarvis.sofa` app group
- Add `widget-images` local Expo module with a Swift `WidgetImagesModule` that downloads and resizes remote poster images into the shared app group container for use by widgets; also copies bundled assets (sofa icon fallback)
- Add `src/lib/widgets.ts` to fetch dashboard data, cache poster images, and write a JSON timeline to the shared container via `expo-widgets`
- Add `ContinueWatching` and `Upcoming` SwiftUI widget views in `src/widgets/`
- Add `useWidgetRefresh` hook that refreshes widgets on foreground (throttled to once per minute) and on session ready
- Debounce widget refresh in `invalidateTitleQueries` so rapid mutations (e.g. marking multiple episodes watched) batch into a single refresh
- Expose `titles.upcoming` from the dashboard procedure and add `upcomingTitles` field to the dashboard schema
- Bump iOS deployment target to 16.2 (required by WidgetKit timeline APIs)

apps/native/app.json

@@ -23,6 +23,14 @@
       "package": "com.jakejarvis.sofa"
     },
     "plugins": [
+      [
+        "expo-build-properties",
+        {
+          "ios": {
+            "deploymentTarget": "16.2"
+          }
+        }
+      ],
       "expo-router",
       "expo-secure-store",
       [
@@ -105,6 +113,27 @@
         {
           "userTrackingPermission": "This identifier will be used to measure app performance and improve your experience."
         }
+      ],
+      [
+        "expo-widgets",
+        {
+          "groupIdentifier": "group.com.jakejarvis.sofa",
+          "bundleIdentifier": "com.jakejarvis.sofa.ExpoWidgetsTarget",
+          "widgets": [
+            {
+              "name": "ContinueWatching",
+              "displayName": "Continue Watching",
+              "description": "Your in-progress TV shows and movies",
+              "supportedFamilies": ["systemSmall"]
+            },
+            {
+              "name": "Upcoming",
+              "displayName": "Upcoming",
+              "description": "Upcoming episodes and movie releases",
+              "supportedFamilies": ["systemSmall"]
+            }
+          ]
+        }
       ]
     ],
     "experiments": {