Add backups with S3, daily cost push, automation templates and a browser tool

- Daily backups (database + config) into <data_dir>/backups, keep N,
  optional upload to any S3-compatible bucket (SigV4, bucket pruning);
  settings panel with run-now, list and download
- Daily cost summary push at 20:00 (opt-in per user, preview button)
- Automations from templates (dependency check, security review, test
  health, daily summary, TODO report, docs freshness) via POST /jobs/create
- browser tool: headless Chromium over CDP – click, type, keys, waits,
  JavaScript, navigation, screenshots, console errors; requests to private
  network addresses are blocked (sub-resources and redirects included)
- Secrets masked in the config view: S3 secret key, metrics token
- Replace the remaining text arrows/refresh glyphs with SVG icons

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

web/src/components/NewSession.tsx

@@ -580,7 +580,7 @@ export function NewSession({ onMenu, onCreated }: { onMenu: () => void; onCreate
 }
 
 /** Browse the user's folders and pick one. */
-function FolderPicker({ path, onPick }: { path: string; onPick: (p: string) => void }) {
+export function FolderPicker({ path, onPick }: { path: string; onPick: (p: string) => void }) {
   const t = useT();
   const [browse, setBrowse] = useState(path);
   const roots = useFetch<{ path: string; name: string }[]>("/fs/roots").data ?? [];