feat: Add app widget system with Glance, reader mode, and reading reminders

- Add Glance dependencies (glance-appwidget:1.1.0, glance-material3:1.1.0) for Compose-based widgets
- Implement RecentLinksWidget (4×2) and QuickStatsWidget (2×1) with Glance framework
- Add legacy RemoteViews widget (ShaarliWidgetProvider) for backward compatibility
- Create WidgetSearchActivity for widget configuration and WidgetUpdateWorker for periodic updates
- Add reader mode support with readerContent and readerContentFetchedAt

app/src/main/java/com/shaarit/presentation/nav/NavGraph.kt

@@ -44,6 +44,10 @@ sealed class Screen(val route: String) {
     object Help : Screen("help")
     object DeadLinks : Screen("dead_links")
     object Pinned : Screen("pinned")
+    object Reader : Screen("reader/{linkId}") {
+        fun createRoute(linkId: Int): String = "reader/$linkId"
+    }
+    object Reminders : Screen("reminders")
 }
 
 @Composable
@@ -153,6 +157,10 @@ fun AppNavGraph(
                 onNavigateToHelp = { navController.navigate(Screen.Help.route) },
                 onNavigateToDeadLinks = { navController.navigate(Screen.DeadLinks.route) },
                 onNavigateToPinned = { navController.navigate(Screen.Pinned.route) },
+                onNavigateToReader = { linkId ->
+                    navController.navigate(Screen.Reader.createRoute(linkId))
+                },
+                onNavigateToReminders = { navController.navigate(Screen.Reminders.route) },
                 initialTagFilter = tag,
                 initialCollectionId = collectionId
             )
@@ -306,5 +314,32 @@ fun AppNavGraph(
                 }
             )
         }
+
+        composable(
+            route = "reader/{linkId}",
+            arguments = listOf(
+                navArgument("linkId") {
+                    type = NavType.IntType
+                }
+            ),
+            deepLinks = listOf(
+                navDeepLink { uriPattern = "shaarit://reader/{linkId}" }
+            )
+        ) {
+            com.shaarit.presentation.reader.ReaderModeScreen(
+                onNavigateBack = { navController.popBackStack() }
+            )
+        }
+
+        composable(
+            route = Screen.Reminders.route
+        ) {
+            com.shaarit.presentation.reminders.RemindersScreen(
+                onNavigateBack = { navController.popBackStack() },
+                onNavigateToReader = { linkId ->
+                    navController.navigate(Screen.Reader.createRoute(linkId))
+                }
+            )
+        }
     }
 }