Phase 2.2 — stop backing /profile and /career from one component behind a
boolean. /career now renders a dedicated CareerProfilePage; /profile keeps
ProfilePage. Each hardcodes its mode and saves only its own concern (identity
vs master profile) via the partial-update endpoint.
This commit is the behaviour-preserving checkpoint: the two components still
share the full implementation (each carries all state, only its own JSX renders).
The per-component pruning that removes the other concern's state/JSX follows in
subsequent commits, verified by tsc at each step.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
cesnimda