fix: replace download flow with manual transfer instructions; rename app package

The Gemma model requires Kaggle login/licence so direct HTTP download is
not possible. Replaces the download screen with adb transfer instructions,
a Scan button that checks the file on disk, and a Continue without AI bypass.

Also renames the Android package from com.example.dailyou to
net.stefwill.dailyou (build.gradle.kts, MainActivity.kt path + declaration)
and adds *.bin to .gitignore to keep model files out of the repo.

lib/app.dart

@@ -9,6 +9,7 @@ class App extends ConsumerWidget {
 
   @override
   Widget build(BuildContext context, WidgetRef ref) {
+    final skipped = ref.watch(modelSkippedProvider);
     final modelPresentAsync = ref.watch(modelPresentProvider);
 
     return MaterialApp(
@@ -17,14 +18,16 @@ class App extends ConsumerWidget {
       theme: _lightTheme(),
       darkTheme: _darkTheme(),
       themeMode: ThemeMode.system,
-      home: modelPresentAsync.when(
-        data: (present) =>
-            present ? const AppShell() : const ModelDownloadScreen(),
-        loading: () => const Scaffold(
-          body: Center(child: CircularProgressIndicator()),
-        ),
-        error: (_, __) => const ModelDownloadScreen(),
-      ),
+      home: skipped
+          ? const AppShell()
+          : modelPresentAsync.when(
+              data: (present) =>
+                  present ? const AppShell() : const ModelDownloadScreen(),
+              loading: () => const Scaffold(
+                body: Center(child: CircularProgressIndicator()),
+              ),
+              error: (_, __) => const ModelDownloadScreen(),
+            ),
     );
   }