feat: add PriorityBadge component and integrate into TaskRow

- Implemented PriorityBadge component to display task priority with icons.
- Created TaskRow component to represent individual tasks with metadata.
- Added breadcrumb navigation for task hierarchy.
- Enhanced checkbox component to support indeterminate state.
- Introduced InputGroup for better input handling in task search.
- Updated tasks route to utilize new components and improve UI.
- Added empty state representation for task list.

src/main/router/index.ts

@@ -230,13 +230,37 @@ const tasksRouter = router({
         .all();
     }),
 
+  listAssignees: publicProcedure.query(() => {
+    const rows = getDb()
+      .select({ assignee: tasks.assignee })
+      .from(tasks)
+      .all();
+    const names = new Set<string>();
+    for (const row of rows) {
+      if (!row.assignee) continue;
+      try {
+        const parsed = JSON.parse(row.assignee) as unknown;
+        if (Array.isArray(parsed)) {
+          for (const n of parsed) {
+            if (typeof n === 'string' && n) names.add(n);
+          }
+        } else {
+          names.add(row.assignee);
+        }
+      } catch {
+        names.add(row.assignee);
+      }
+    }
+    return [...names].sort();
+  }),
+
   create: publicProcedure
     .input(z.object({
       title: z.string(),
       description: z.string().optional(),
       status: z.string().optional(),
       priority: z.string().optional(),
-      assignee: z.string().optional(),
+      assignees: z.array(z.string()).optional(),
       dueDate: z.number().optional(),
       projectId: z.string().optional(),
     }))
@@ -249,7 +273,7 @@ const tasksRouter = router({
         description: input.description ?? null,
         status: input.status ?? 'todo',
         priority: input.priority ?? 'medium',
-        assignee: input.assignee ?? null,
+        assignee: input.assignees?.length ? JSON.stringify(input.assignees) : null,
         dueDate: input.dueDate ?? null,
         projectId: input.projectId ?? null,
         createdAt: now,
@@ -264,7 +288,7 @@ const tasksRouter = router({
       description: z.string().optional(),
       status: z.string().optional(),
       priority: z.string().optional(),
-      assignee: z.string().optional(),
+      assignees: z.array(z.string()).optional(),
       dueDate: z.number().optional(),
       projectId: z.string().optional(),
     }))
@@ -282,7 +306,7 @@ const tasksRouter = router({
       if (input.description !== undefined) set.description = input.description;
       if (input.status !== undefined) set.status = input.status;
       if (input.priority !== undefined) set.priority = input.priority;
-      if (input.assignee !== undefined) set.assignee = input.assignee;
+      if (input.assignees !== undefined) set.assignee = input.assignees.length ? JSON.stringify(input.assignees) : null;
       if (input.dueDate !== undefined) set.dueDate = input.dueDate;
       if (input.projectId !== undefined) set.projectId = input.projectId;
       if (Object.keys(set).length > 0) {