feat(mobile): UI-03 forms and collaboration pages (09-12)

- Page 09 create: grouped form (Event details / Description & languages),
  required default-language selector, zh-CN/en tabs with per-locale
  title/description/venue/address, explicit timezone field, bottom save
  button kept keyboard-reachable, create mode has no Access tab
- Page 10 edit: Details/Access tabs sharing one draft; Access has four
  switches with explanations; original downloads constrained by downloads
  (disabled + forced off in PATCH); unsaved-changes PopScope confirm;
  save commits all changes in one minimal PATCH
- Page 11 members: Owner group + Collaborators list with initial avatars
  and per-row remove; full-width Invite colleague opens account-search
  bottom sheet (debounced prefix search, race guard, already-added state);
  remove confirm names the member
- Page 12 categories: extracted to standalone page with per-row edit/
  delete menu and New category sheet (language tabs + name + sort order);
  delete confirm mentions photo impact; collaborator browse-only; old
  inline section removed from album detail
- l10n: new form/members/categories keys both locales; regenerated
- tests: form 14, members 6, categories 7, detail nav 1; full suite green

Co-Authored-By: Claude Code <noreply@anthropic.com>

apps/mobile/test/pages/album_detail_page_test.dart

@@ -3,9 +3,8 @@
 /// 覆盖：封面 → 标题/时区时间场地 → 状态徽章 → 次级四入口（Photos/
 /// Members/Categories/Share）→ Recent photos 三列网格 + See all → 底部
 /// 固定上传栏（拍摄上传主 / 从相册选择次，上传关闭时禁用并说明）；空相册
-/// 安静占位；协作者（scope all 403 → own）隐藏管理入口；分类管理三流
-/// （新增载荷、空名校验、编辑 PATCH、删除确认）；底部栏直达连拍页与多选
-/// 入队。
+/// 安静占位；协作者（scope all 403 → own）隐藏管理入口；分类入口跳转
+/// 独立分类页（页面 12，旧内嵌区块已移除）；底部栏直达连拍页与多选入队。
 library;
 
 import 'dart:io';
@@ -24,6 +23,7 @@ import 'package:photo_live/features/uploads/preparer.dart';
 import 'package:photo_live/features/uploads/providers.dart';
 import 'package:photo_live/features/uploads/task_store.dart';
 import 'package:photo_live/l10n/app_localizations.dart';
+import 'package:photo_live/pages/album_categories_page.dart';
 import 'package:photo_live/pages/album_detail_page.dart';
 import 'package:photo_live/pages/capture_page.dart';
 
@@ -270,186 +270,38 @@ void main() {
     expect(find.byIcon(Icons.broken_image_outlined), findsOneWidget);
   });
 
-  testWidgets('新增分类：填名称与排序 → POST 载荷 → 列表刷新', (tester) async {
-    var posted = false;
-    final adapter = detailAdapter(
-      onCategoryMutation: (method, path) {
-        if (method == 'POST') {
-          posted = true;
-          categories = <Map<String, dynamic>>[
-            ...categories,
-            categoryJson(
-              id: 'cat-new',
-              sortOrder: 5,
-              translations: <Map<String, dynamic>>[
-                <String, dynamic>{'locale': 'zh-CN', 'name': '签到'},
-                <String, dynamic>{'locale': 'en', 'name': 'Check-in'},
-              ],
-            ),
-          ];
-          return (201, categoryJson(id: 'cat-new', sortOrder: 5));
-        }
-        return null;
-      },
-    );
-    await pumpDetail(tester, clientOf(adapter));
-
-    await reveal(tester, find.byIcon(Icons.add_circle_outline));
-    await tester.tap(find.byIcon(Icons.add_circle_outline).hitTestable());
-    await tester.pumpAndSettle();
-
-    await tester.enterText(
-      find.widgetWithText(TextFormField, 'Chinese name'),
-      '签到',
-    );
-    await tester.enterText(
-      find.widgetWithText(TextFormField, 'English name'),
-      'Check-in',
-    );
-    await tester.enterText(
-      find.widgetWithText(TextFormField, 'Sort order'),
-      '5',
-    );
-    await tester.tap(find.text('Save'));
-    await tester.pumpAndSettle();
-
-    expect(posted, isTrue);
-    // 成功后详情重载会追加 GET，故按方法+路径取 POST。
-    final request = adapter.requests.singleWhere(
-      (r) => r.method == 'POST' && r.path == '/v1/albums/alb-1/categories',
-    );
-    expect(request.path, '/v1/albums/alb-1/categories');
-    expect(request.body, <String, dynamic>{
-      'sortOrder': 5,
-      'translations': <Map<String, dynamic>>[
-        <String, dynamic>{'locale': 'zh-CN', 'name': '签到'},
-        <String, dynamic>{'locale': 'en', 'name': 'Check-in'},
-      ],
-    });
-    // 详情重载后列表含新分类。
-    expect(find.text('签到 · Check-in'), findsOneWidget);
-  });
-
-  testWidgets('新增分类：名称全空 → 客户端拦截，不发请求', (tester) async {
+  testWidgets('分类入口：跳转独立分类页（旧内嵌区块已移除）', (tester) async {
     final adapter = detailAdapter();
     await pumpDetail(tester, clientOf(adapter));
 
-    final requestsBefore = adapter.requests.length;
-    await reveal(tester, find.byIcon(Icons.add_circle_outline));
-    await tester.tap(find.byIcon(Icons.add_circle_outline).hitTestable());
-    await tester.pumpAndSettle();
-
-    await tester.tap(find.text('Save'));
-    await tester.pump();
-
-    expect(
-      find.text('At least one language name is required'),
-      findsOneWidget,
-    );
-    expect(adapter.requests, hasLength(requestsBefore));
-  });
-
-  testWidgets('编辑分类：预填并改名 → PATCH 全量 translations + sortOrder',
-      (tester) async {
-    var patched = false;
-    final adapter = detailAdapter(
-      onCategoryMutation: (method, path) {
-        if (method == 'PATCH') {
-          patched = true;
-          categories = <Map<String, dynamic>>[
-            categoryJson(
-              id: 'cat-1',
-              sortOrder: 2,
-              translations: <Map<String, dynamic>>[
-                <String, dynamic>{'locale': 'zh-CN', 'name': '签到墙'},
-                <String, dynamic>{'locale': 'en', 'name': 'Ceremony'},
-              ],
-            ),
-          ];
-          return (200, categoryJson(id: 'cat-1'));
-        }
-        return null;
-      },
-    );
-    await pumpDetail(tester, clientOf(adapter));
-
-    await reveal(tester, find.text('仪式 · Ceremony'));
-    await tester.tap(find.text('仪式 · Ceremony').hitTestable());
-    await tester.pumpAndSettle();
-
-    // 预填检查。
-    final zhField = tester.widget<TextFormField>(
-      find.widgetWithText(TextFormField, 'Chinese name'),
-    );
-    expect(zhField.controller!.text, '仪式');
-
-    await tester.enterText(
-      find.widgetWithText(TextFormField, 'Chinese name'),
-      '签到墙',
-    );
-    await tester.enterText(
-      find.widgetWithText(TextFormField, 'Sort order'),
-      '2',
-    );
-    await tester.tap(find.text('Save'));
-    await tester.pumpAndSettle();
-
-    expect(patched, isTrue);
-    // 成功后详情重载会追加 GET，故按方法+路径取 PATCH。
-    final request = adapter.requests.singleWhere(
-      (r) => r.method == 'PATCH' && r.path == '/v1/categories/cat-1',
-    );
-    expect(request.body, <String, dynamic>{
-      'sortOrder': 2,
-      'translations': <Map<String, dynamic>>[
-        <String, dynamic>{'locale': 'zh-CN', 'name': '签到墙'},
-        <String, dynamic>{'locale': 'en', 'name': 'Ceremony'},
-      ],
-    });
-    expect(find.text('签到墙 · Ceremony'), findsOneWidget);
-  });
-
-  testWidgets('删除分类：确认对话框 → DELETE → 列表移除', (tester) async {
-    final adapter = detailAdapter(
-      onCategoryMutation: (method, path) {
-        if (method == 'DELETE') {
-          categories = <Map<String, dynamic>>[];
-          return (204, null);
-        }
-        return null;
-      },
-    );
-    await pumpDetail(tester, clientOf(adapter));
-
-    await reveal(tester, find.byIcon(Icons.delete_outline));
-    await tester.tap(find.byIcon(Icons.delete_outline).hitTestable());
-    await tester.pumpAndSettle();
-
-    expect(
-      find.text('Delete this category? Its photos will become uncategorized.'),
-      findsOneWidget,
-    );
-    // 取消可用：先取消再重删，验证确认门。
-    await tester.tap(find.text('Cancel'));
-    await tester.pumpAndSettle();
-    expect(find.text('仪式 · Ceremony'), findsOneWidget);
-
-    await reveal(tester, find.byIcon(Icons.delete_outline));
-    await tester.tap(find.byIcon(Icons.delete_outline).hitTestable());
-    await tester.pumpAndSettle();
-    await tester.tap(find.widgetWithText(FilledButton, 'Delete'));
-    await tester.pumpAndSettle();
-
-    expect(
-      adapter.requests.any(
-        (r) => r.method == 'DELETE' && r.path == '/v1/categories/cat-1',
-      ),
-      isTrue,
-    );
+    // 旧内嵌分类管理区块不再存在于详情页。
+    expect(find.byIcon(Icons.add_circle_outline), findsNothing);
     expect(find.text('仪式 · Ceremony'), findsNothing);
-    expect(find.text('No categories yet. Tap + to add one'), findsOneWidget);
+
+    // Categories 入口 → 独立分类页（页面 12）。入口在折叠线下，先滚动
+    // 可见再点击。
+    final tilesCard = find.byType(Card).first;
+    final categoriesTile =
+        find.descendant(of: tilesCard, matching: find.text('Categories'));
+    await reveal(tester, categoriesTile);
+    await tester.tap(categoriesTile);
+    await tester.pumpAndSettle();
+    expect(find.byType(AlbumCategoriesPage), findsOneWidget);
+    expect(find.text('仪式'), findsOneWidget, reason: '分类列表（默认语言名）');
+
+    // 返回后详情重载（分类随详情返回）。
+    await tester.pageBack();
+    await tester.pumpAndSettle();
+    expect(find.byType(AlbumCategoriesPage), findsNothing);
+    expect(
+      adapter.requests
+          .where((r) => r.method == 'GET' && r.path == '/v1/albums/alb-1')
+          .length,
+      greaterThanOrEqualTo(2),
+    );
   });
 
+
   group('底部固定上传栏（原 Task 9 FAB 流迁移）', () {
     late Directory tmp;
     late List<String> galleryPaths;