refactor(profile): slim ProfilePage and CareerProfilePage to their own concerns

Complete the Phase 2.2 split. Each dedicated component now carries only its own
state, effects, and JSX; the shared-copy duplication from the split checkpoint
is removed.

- ProfilePage (/profile): 1372 -> ~495 lines. Dropped the 700-line master-CV
  block, all CV/rewrite/PDF state + helpers + the extraction-run polling effects.
  loadProfile now fetches only /auth/me (no runs/jobs). Saves identity only.
- CareerProfilePage (/career): dropped identity fields, password, 2FA/sessions
  and their state; loadProfile no longer sets identity fields. Saves the master
  profile only. Owns the master-CV editing surface.

Both save through the partial-update PUT /auth/profile, so neither can overwrite
the other's data. The master career profile stays the only editable source of
truth on /career.

Tests: the CV-editing tests in profile-page.test.tsx now render CareerProfilePage
(where that surface lives) — all 5 pass, fixing 4 pre-existing failures that were
caused by the display:none shared block.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

job-tracker-ui/src/profile-page.test.tsx

@@ -87,11 +87,12 @@ function renderWith(Component: React.ComponentType) {
   );
 }
 
-// /profile (account identity) — the CV-editing surface still renders here (display:none) because
-// the two components share the same underlying implementation; these tests exercise that surface.
+// These exercise the master-CV editing surface, which lives on /career (CareerProfilePage) after
+// the Phase 2.2 split. ProfilePage no longer carries it.
 function renderPage() {
-  return renderWith(ProfilePage);
+  return renderWith(CareerProfilePage);
 }
+void ProfilePage;
 
 beforeEach(() => {
   mockedApi.get.mockImplementation((url: string) => {