fix(dashboard): UI polish — modals, layout, consistency, test fixes

Dashboard UX polish pass — consolidates create forms into modals
triggered from the page header, fixes layout inconsistencies, adds
scroll-to navigation for the Keys page, and aligns the TokenBar with
the design system.

Changes:
- App.tsx: add padding to sidebar header
- resolve-page-title.ts: add missing routes, better fallback title
- en.ts: fix nav labels (Profiles was 'profiles : multi agents')
- ModelsPage: two-col layout, auxiliary tasks modal, TokenBar redesign
- ProfilesPage: create button in header, form in modal, Checkbox component
- CronPage: create button in header, form in modal
- EnvPage: scroll-to sub-nav in header, fix text overflow

Modal and dialog standardization:
- Replace all native confirm()/window.confirm() with ConfirmDialog
  (OAuthProvidersCard, PluginsPage, ModelsPage, ConfigPage)
- Add useModalBehavior hook (Escape-to-close, scroll lock, focus restore)
- Apply hook to ProfilesPage, CronPage, AuxiliaryTasksModal

Component fixes (from PR review):
- Checkbox: fix controlled/uncontrolled mismatch, add focus-visible ring
- TokenBar: add rounded-full to legend dots, remove dead code

CI/test fixes:
- Fix TS unused imports (noUnusedLocals), type-narrow PickerTarget union
- Add windows-footgun suppression on platform-guarded os.killpg
- Fix 19 stale unit tests + 9 e2e tests broken by recent main changes
- Restore minimal example-dashboard plugin for plugin auth test

web/src/lib/resolve-page-title.ts

@@ -4,10 +4,12 @@ const BUILTIN: Record<string, keyof Translations["app"]["nav"]> = {
   "/chat": "chat",
   "/sessions": "sessions",
   "/analytics": "analytics",
+  "/models": "models",
   "/logs": "logs",
   "/cron": "cron",
   "/skills": "skills",
   "/plugins": "plugins",
+  "/profiles": "profiles",
   "/config": "config",
   "/env": "keys",
   "/docs": "documentation",
@@ -30,5 +32,10 @@ export function resolvePageTitle(
   if (key) {
     return t.app.nav[key];
   }
+  // Derive title from pathname: "/profiles" → "Profiles"
+  const segment = normalized.slice(1);
+  if (segment) {
+    return segment.charAt(0).toUpperCase() + segment.slice(1);
+  }
   return t.app.webUi;
 }