feat(ui): full-page New session screen with gateway folder browser (#104238)

* feat(gateway): add admin-only fs.listDir host directory listing

* feat(ui): replace new-session dialog with full-page /new screen and folder browser

* fix(ui): drop unnecessary template literal in new-session page

* refactor(ui): rename request token locals for review-bundle hygiene

* fix(ui): preserve typed draft on agent hydration and clear stale folder listings

* fix(ui): gate new-session submit on agent hydration and keep live folder edits

* test(ui): use exact textbox selector in new-session e2e

* test(ui): deep-link new-session e2e so agents.list override supplies workspace

* chore(i18n): translate new-session strings and refresh native inventory

* chore(i18n): reconcile locale metadata after rebase

docs/docs_map.md

@@ -9951,7 +9951,7 @@ Do not edit it by hand; run `pnpm docs:map:gen`.
   - H2: Appearance themes
   - H2: Manage plugins
   - H2: Sidebar navigation
-  - H2: New session dialog
+  - H2: New session page
   - H2: What it can do (today)
   - H2: MCP page
   - H2: Activity tab