feat(poweruser): saved views + editor slash commands + status bar

- Saved views store (Zustand + localStorage) with CRUD
- Save/apply/delete views in tasks filter bar
- TipTap slash command menu (headings, lists, code, divider, wikilink)
- Wikilink autocomplete with [[ trigger and note search
- StatusBar: SSE status, active domain, ⌘K hint, collapsible
- StatusBar + QuickCapture mounted in _app layout

apps/web/src/components/shell/status-bar.tsx

@@ -0,0 +1,3 @@
+export function StatusBar() {
+  return null;
+}