fix: path is not defined in renderPage and HAVING clause SQL error

- router.js: route-announcer used bare `path` variable which is not in scope
  inside renderPage(); replaced with `route.path`
- dashboard.js: shoppingLists query used `HAVING open_count > 0` without GROUP BY;
  SQLite rejects this — replaced with a WHERE subquery

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

public/router.js

@@ -343,7 +343,7 @@ async function renderPage(route, previousPath = null) {
     // Route-Announcer: Screenreader über Seitenwechsel informieren (gezielt, nicht gesamter Inhalt)
     const announcer = document.getElementById('route-announcer');
     if (announcer) {
-      const pageLabel = navItems().find((n) => n.path === path)?.label ?? path;
+      const pageLabel = navItems().find((n) => n.path === route.path)?.label ?? route.path;
       announcer.textContent = '';
       setTimeout(() => { announcer.textContent = pageLabel; }, 50);
     }

server/routes/dashboard.js

@@ -144,7 +144,7 @@ router.get('/', (req, res) => {
         (SELECT COUNT(*) FROM shopping_items si WHERE si.list_id = sl.id AND si.is_checked = 0) AS open_count,
         (SELECT COUNT(*) FROM shopping_items si WHERE si.list_id = sl.id) AS total_count
       FROM shopping_lists sl
-      HAVING open_count > 0
+      WHERE (SELECT COUNT(*) FROM shopping_items si WHERE si.list_id = sl.id AND si.is_checked = 0) > 0
       ORDER BY sl.updated_at DESC
       LIMIT 3
     `).all();