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/core/providers/model_download_provider.dart

@@ -8,31 +8,46 @@ final modelPresentProvider = FutureProvider<bool>((ref) {
   return ModelDownloadService().isModelPresent();
 });
 
-// ── Download notifier — streams progress and marks completion ─────────────────
+// ── Has the user chosen to skip the model requirement? ───────────────────────
 
-class ModelDownloadNotifier extends Notifier<AsyncValue<double>> {
+class _SkipNotifier extends Notifier<bool> {
   @override
-  AsyncValue<double> build() => const AsyncData(0.0);
-
-  Future<void> startDownload() async {
-    state = const AsyncData(0.0);
-    try {
-      await for (final progress in ModelDownloadService().download()) {
-        if (!ref.mounted) return;
-        state = AsyncData(progress);
-      }
-      if (!ref.mounted) return;
-      await ref.read(settingsNotifierProvider.notifier).markModelDownloaded();
-      ref.invalidate(modelPresentProvider);
-    } catch (e, st) {
-      if (!ref.mounted) return;
-      state = AsyncError(e, st);
-    }
-  }
-
-  void reset() => state = const AsyncData(0.0);
+  bool build() => false;
+  void skip() => state = true;
 }
 
-final modelDownloadNotifierProvider =
-    NotifierProvider<ModelDownloadNotifier, AsyncValue<double>>(
-        ModelDownloadNotifier.new);
+final modelSkippedProvider =
+    NotifierProvider<_SkipNotifier, bool>(_SkipNotifier.new);
+
+// ── Scan notifier — checks for the model on demand ────────────────��──────────
+
+class ModelScanNotifier extends Notifier<AsyncValue<bool>> {
+  @override
+  AsyncValue<bool> build() => const AsyncData(false);
+
+  Future<void> scan() async {
+    state = const AsyncLoading();
+    final next = await AsyncValue.guard(
+      () => ModelDownloadService().isModelPresent(),
+    );
+    if (!ref.mounted) return;
+    next.whenData((present) async {
+      if (present) {
+        await ref.read(settingsNotifierProvider.notifier).markModelDownloaded();
+        ref.invalidate(modelPresentProvider);
+      } else {
+        state = AsyncError(
+          Exception('Model file not found at expected path'),
+          StackTrace.current,
+        );
+      }
+    });
+    if (next is AsyncError) state = next;
+  }
+
+  void skipToApp() => ref.read(modelSkippedProvider.notifier).skip();
+}
+
+final modelScanProvider =
+    NotifierProvider.autoDispose<ModelScanNotifier, AsyncValue<bool>>(
+        ModelScanNotifier.new);