修复白屏BUG、UI 边界溢出 BUG

lib/features/profile/application/profile_controller.dart

@@ -17,11 +17,34 @@ class ProfileNotifier extends AsyncNotifier<UserProfile> {
   Future<UserProfile> build() async {
     final isar = await ref.watch(isarProvider.future);
     final profile = await isar.userProfiles.get(AppDefaults.singletonId);
-    if (profile != null) return profile;
-    // Bootstrap should have created one; create defensively.
-    final fresh = UserProfile.createDefault();
-    await isar.writeTxn(() => isar.userProfiles.put(fresh));
-    return fresh;
+    if (profile == null) {
+      // Bootstrap should have created one; create defensively.
+      final fresh = UserProfile.createDefault();
+      await isar.writeTxn(() => isar.userProfiles.put(fresh));
+      return fresh;
+    }
+    if (_isLocalAvatarMissing(profile)) {
+      return _clearMissingLocalAvatar(profile);
+    }
+    return profile;
+  }
+
+  bool _isLocalAvatarMissing(UserProfile profile) {
+    if (profile.avatarSource != AvatarSource.localFile) return false;
+    final path = profile.avatarLocalPath?.trim();
+    if (path == null || path.isEmpty) return true;
+    return !File(path).existsSync();
+  }
+
+  Future<UserProfile> _clearMissingLocalAvatar(UserProfile current) async {
+    final updated = current.copyWith(
+      avatarAssetPath: AppDefaults.defaultAvatarAssetPath,
+      avatarLocalPath: null,
+      avatarSource: AvatarSource.asset,
+    );
+    final isar = await ref.read(isarProvider.future);
+    await isar.writeTxn(() => isar.userProfiles.put(updated));
+    return updated;
   }
 
   Future<void> updateNickname(String nickname) async {
@@ -68,6 +91,19 @@ class ProfileNotifier extends AsyncNotifier<UserProfile> {
   Future<void> resetAvatar() async {
     final current = state.value;
     if (current == null) return;
+
+    final path = current.avatarLocalPath;
+    if (path != null && path.isNotEmpty) {
+      final file = File(path);
+      if (await file.exists()) {
+        try {
+          await file.delete();
+        } catch (_) {
+          // Best-effort cleanup; profile reset still proceeds.
+        }
+      }
+    }
+
     final updated = current.copyWith(
       avatarAssetPath: AppDefaults.defaultAvatarAssetPath,
       avatarLocalPath: null,

lib/features/profile/presentation/avatar_image.dart

@@ -0,0 +1,19 @@
+import 'dart:io';
+
+import 'package:flutter/material.dart';
+
+import 'package:arcx/core/constants/app_defaults.dart';
+import 'package:arcx/data/local/models/models.dart';
+
+/// Resolves a profile avatar to a local file when present, otherwise the
+/// default asset. Missing local files fall back safely (no FileImage crash).
+ImageProvider resolveAvatarImage(UserProfile? profile) {
+  final path = profile?.avatarLocalPath?.trim();
+  if (profile?.avatarSource == AvatarSource.localFile &&
+      path != null &&
+      path.isNotEmpty &&
+      File(path).existsSync()) {
+    return FileImage(File(path));
+  }
+  return const AssetImage(AppDefaults.defaultAvatarAssetPath);
+}

lib/features/profile/presentation/profile_edit_dialog.dart

@@ -1,12 +1,10 @@
-import 'dart:io';
-
 import 'package:flutter/material.dart';
 import 'package:flutter_riverpod/flutter_riverpod.dart';
 
 import 'package:arcx/app/app_theme.dart';
-import 'package:arcx/core/constants/app_defaults.dart';
 import 'package:arcx/data/local/models/models.dart';
 import 'package:arcx/features/profile/application/profile_controller.dart';
+import 'package:arcx/features/profile/presentation/avatar_image.dart';
 
 class ProfileEditDialog extends ConsumerStatefulWidget {
   const ProfileEditDialog({super.key});
@@ -137,23 +135,13 @@ class _AvatarPreview extends StatelessWidget {
 
   @override
   Widget build(BuildContext context) {
-    final p = profile;
-    final ImageProvider image;
-    if (p != null &&
-        p.avatarSource == AvatarSource.localFile &&
-        p.avatarLocalPath != null &&
-        p.avatarLocalPath!.isNotEmpty) {
-      image = FileImage(File(p.avatarLocalPath!));
-    } else {
-      image = const AssetImage(AppDefaults.defaultAvatarAssetPath);
-    }
     return Stack(
       alignment: Alignment.bottomRight,
       children: [
         CircleAvatar(
           radius: 44,
           backgroundColor: AppTheme.surfaceMuted,
-          backgroundImage: image,
+          backgroundImage: resolveAvatarImage(profile),
         ),
         Container(
           padding: const EdgeInsets.all(6),