[safina57]

Untangles the frontend so a typical change lands in one place.

Structure

• Store owns the workspace rules. Opening a bookmark, removing a context trial (its pin goes with it), clearing a stale selection and saving/restoring the workspace around the tour are store actions instead of logic spread across HomePage and the tour.
• Panels read their own state. Chat, map, summary and bookmarks use the store and hooks/useWorkspace.ts. HomePage only picks DesktopLayout or MobileLayout; MobileLayout goes from 13 props to 3.
• One trial cache key. trialQuery() replaces ['trial', ref] from 7 places and the fetchTrial prop that existed only for tests.
• One API client. services/api.ts replaces the fetch, error and camelCase code copied into six services.
• One status vocabulary. constants/trialStatus.ts (key order is display priority), StatusDot and StatusLabel, plus title, place and site-key helpers in lib/trial.
• Shared UI. BrandTitle (header, mobile menu, consent), LanguageOptions (gate, picker, mobile menu), the PDF owns its English copy, MapPanel places its own overlays (compact, topInset).
• No copied CSS durations. Timers that mirrored transition lengths now wait on the browser (lib/motion).
• Dead code removed (TrialMarker, extractTrialRefs, unused Turnstile fields, Ontario geojson, 8 unused locale keys).

Fixes

• Trials added to the chat now show under the user's message again (useChat wrote a field renamed in feat: wire the agent to the full CTC corpus #102).
• PDF export no longer stalls about 3s when the data-freshness endpoint is down.
• Bookmark badges show the status in the chosen language.
• A chat turn that drops the selected trial clears the selection instead of leaving an empty expanded summary.
• Failed feedback shows a toast and can be retried.
• Screen-reader labels for citations, definitions and NCT chips are translated.

Visible changes

• Language tiles use the gate's bordered look everywhere.
• The consent badge reads "Pre-Release Version", like the header.
• Dark mode applies on the Terms, Debug and 404 pages too.
• Favicon is the Camille mark, following the OS light or dark scheme.

The new locale strings (chat.showOnMap, chat.definition, feedback.removeNct, feedback.failed) need a native-speaker check.