Phase 7: Search, filters, templates, and archive UI

Add full-text card search (PostgreSQL tsvector + GIN index) with navbar
SearchBar, client-side board filters (label/assignee/due date), board
templates (3 system templates + save-as-template API), and archive
toggle for both board listing and board view.

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

src/routes/api/boards/[boardId]/archived-cards/+server.ts

@@ -0,0 +1,31 @@
+import { json, error } from '@sveltejs/kit';
+import type { RequestHandler } from './$types.js';
+import { withTenant } from '$lib/server/rls.js';
+import { requireAuth, requireBoardView } from '$lib/server/guards.js';
+
+export const GET: RequestHandler = async ({ params, locals }) => {
+	const tenant = locals.tenant;
+	if (!tenant) throw error(400, 'Unknown tenant');
+	requireAuth(locals.user);
+
+	const cards = await withTenant(tenant.id, async (tx) => {
+		// Verify user has access to this board
+		await requireBoardView(tx, locals.user, params.boardId, tenant.id);
+
+		return tx.card.findMany({
+			where: {
+				archived: true,
+				column: { board: { id: params.boardId, tenantId: tenant.id } }
+			},
+			include: {
+				labels: { include: { tag: true } },
+				assignees: {
+					include: { user: { select: { id: true, name: true, avatarUrl: true } } }
+				}
+			},
+			orderBy: { updatedAt: 'desc' }
+		});
+	});
+
+	return json({ cards });
+};