fix: load tasks via TasksApi in Knowledge view, remove tab counts

Tasks are not part of the knowledge API (backend rejects type=task).
When the Tasks tab is selected, fetch from /api/tasks and convert to
KnowledgeItem. Also removes per-type counts from tab labels to prevent
tabs from awkwardly resizing when counts load.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

lib/data/models/knowledge_item.dart

@@ -1,3 +1,5 @@
+import 'task.dart';
+
 class KnowledgeItem {
   final int id;
   final String noteType; // 'note' | 'person' | 'place' | 'list' | 'task'
@@ -30,6 +32,22 @@ class KnowledgeItem {
     required this.updatedAt,
   });
 
+  factory KnowledgeItem.fromTask(Task task) => KnowledgeItem(
+        id: task.id,
+        noteType: 'task',
+        title: task.title,
+        body: task.description ?? '',
+        tags: const [],
+        projectId: task.projectId,
+        milestoneId: task.milestoneId,
+        parentId: task.parentId,
+        status: task.status.value,
+        priority: task.priority.value,
+        dueDate: task.dueDate?.toIso8601String(),
+        createdAt: task.createdAt,
+        updatedAt: task.updatedAt,
+      );
+
   factory KnowledgeItem.fromJson(Map<String, dynamic> json) => KnowledgeItem(
         id: json['id'] as int,
         noteType: json['note_type'] as String? ?? 'note',

lib/providers/knowledge_provider.dart

@@ -4,6 +4,8 @@ import '../data/models/knowledge_item.dart';
 import '../data/repositories/knowledge_repository.dart';
 import 'api_client_provider.dart';
 
+export '../data/models/knowledge_item.dart';
+
 /// Immutable state for the Knowledge screen's two-tier paginated feed.
 class KnowledgeState {
   final List<int> ids;
@@ -150,6 +152,23 @@ class KnowledgeNotifier extends Notifier<KnowledgeState> {
   Future<void> _fetchFromScratch() async {
     state = state.copyWith(isLoadingIds: true, error: null);
     try {
+      if (state.noteType == 'task') {
+        // Tasks live under /api/tasks — fetch all and convert directly.
+        final tasks = await ref.read(tasksApiProvider).getAll();
+        final items = {
+          for (final t in tasks) t.id: KnowledgeItem.fromTask(t),
+        };
+        state = state.copyWith(
+          ids: tasks.map((t) => t.id).toList(),
+          items: items,
+          totalIds: tasks.length,
+          isLoadingIds: false,
+          hasMore: false,
+        );
+        await _loadCounts();
+        return;
+      }
+
       final (ids, total) = await _repo.fetchIds(
         noteType: state.noteType,
         tags: state.activeTags,

lib/screens/knowledge/knowledge_screen.dart

@@ -74,15 +74,7 @@ class _KnowledgeScreenState extends ConsumerState<KnowledgeScreen>
     });
   }
 
-  String _tabLabel(int index, Map<String, int> counts) {
-    final tab = _kTabs[index];
-    if (tab.type == null) {
-      final total = counts.values.fold(0, (a, b) => a + b);
-      return total > 0 ? 'All ($total)' : 'All';
-    }
-    final count = counts[tab.type];
-    return count != null && count > 0 ? '${tab.label} ($count)' : tab.label;
-  }
+  String _tabLabel(int index) => _kTabs[index].label;
 
   @override
   Widget build(BuildContext context) {
@@ -119,7 +111,7 @@ class _KnowledgeScreenState extends ConsumerState<KnowledgeScreen>
           tabAlignment: TabAlignment.start,
           tabs: List.generate(
             _kTabs.length,
-            (i) => Tab(text: _tabLabel(i, state.counts)),
+            (i) => Tab(text: _tabLabel(i)),
           ),
         ),
       ),