Add dismiss functionality for completed standalone tasksmakima/task-task-5dde682c-5dde682c

## Changes

### Backend
- Add 'hidden' field to Task model (models.rs)
- Add database migration for hidden column (20250122000000_add_task_hidden.sql)
- Update task listing queries to include hidden field and filter out hidden tasks
- Update update_task_for_owner to handle hidden field

### Frontend
- Add hidden field to TaskSummary interface (api.ts)
- Add dismissTask API function (api.ts)
- Add hideTask function to useTasks hook
- Add Dismiss button to TaskList for completed standalone tasks
- Wire up onDismiss handler in mesh.tsx route

## Behavior
- Completed standalone tasks (tasks without a contract) show a "Dismiss" button
- Dismissing a task sets hidden=true and removes it from the task list
- Hidden tasks are filtered out by default in all task listing queries

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

1 files changed, 17 insertions, 0 deletions

diff --git a/makima/frontend/src/hooks/useTasks.ts b/makima/frontend/src/hooks/useTasks.ts
index 6e6c992..4667c4c 100644
--- a/makima/frontend/src/hooks/useTasks.ts
+++ b/makima/frontend/src/hooks/useTasks.ts
@@ -5,6 +5,7 @@ import {
   createTask,
   updateTask,
   deleteTask,
+  dismissTask,
   VersionConflictError,
   type TaskSummary,
   type TaskWithSubtasks,
@@ -110,6 +111,21 @@ export function useTasks() {
     [fetchTasks]
   );
 
+  const hideTask = useCallback(
+    async (id: string): Promise<boolean> => {
+      setError(null);
+      try {
+        await dismissTask(id);
+        await fetchTasks(); // Refresh list
+        return true;
+      } catch (e) {
+        setError(e instanceof Error ? e.message : "Failed to dismiss task");
+        return false;
+      }
+    },
+    [fetchTasks]
+  );
+
   // Initial fetch
   useEffect(() => {
     fetchTasks();
@@ -126,5 +142,6 @@ export function useTasks() {
     saveTask,
     editTask,
     removeTask,
+    hideTask,
   };
 }