feat: task tags, sort controls, and tag filtering

- Added tags (JSONB array) to tasks schema with full CRUD support
- Tag editor in TaskDetailPanel with chip UI, Enter/comma to add, Backspace to remove
- Tag badges on TaskCard, KanbanBoard cards, and DashboardPage
- Sort controls on QueuePage: sort by priority, due date, created, updated, name
- Sort direction toggle (asc/desc) with persistence to localStorage
- Tag filter dropdown in QueuePage header (populated from existing tags)
- Search now matches tags
- Backend: tags in create/update, progressNotes in PATCH body

backend/src/db/schema.ts

@@ -82,6 +82,7 @@ export const tasks = pgTable("tasks", {
   assigneeName: text("assignee_name"),
   projectId: uuid("project_id").references(() => projects.id, { onDelete: "set null" }),
   dueDate: timestamp("due_date", { withTimezone: true }),
+  tags: jsonb("tags").$type<string[]>().default([]),
   subtasks: jsonb("subtasks").$type<Subtask[]>().default([]),
   progressNotes: jsonb("progress_notes").$type<ProgressNote[]>().default([]),
   createdAt: timestamp("created_at", { withTimezone: true }).defaultNow().notNull(),