spa hardening, offline logging, rate limit fixes

server:
- backup exporter, auth extractors, error shapes, CONTEXT (prior work)
- spa assets served outside the rate limit via route_layer
- requests_per_second went to per_second(), which takes an interval not a
  rate: 50 meant one request per 50s once burst was spent. now converted
  properly. 15/s, burst 60

spa fixes:
- account delete cleared snake_case token keys that were never written
- refresh interceptor could retry forever
- date ranges used local day boundaries stamped +00:00
- "all" period trend plotted one page; calendar days fabricated mood 3
- chart grid invisible: hsl(var(--border)) against rgba tokens
- blob url leak, orphaned media on failed save, devtools in prod bundle
- pt-safe/safe-area-pb classes never existed

spa features:
- offline outbox: entries queue to IndexedDB, replay with backoff, only
  server refusals count against an entry
- drafts persist, quick-log sheet, diary infinite scroll + filters
- route error boundary, stale-chunk recovery, no service worker in dev

a11y + perf:
- mood picker is a radiogroup, activity picker keyboard-operable,
  text alternatives for colour/emoji, locale week start
- dark glass over the bright photo: worst case 1.4:1 -> 4.9-9.6:1
- initial payload 1095->769kB raw, 306->230kB gzip; 38 unused components
  and 5 deps dropped; fonts 218->133kB

53 tests added (43 spa, 10 server)

spa/package.json

@@ -15,7 +15,6 @@
   "dependencies": {
     "@base-ui/react": "^1.7.0",
     "@fontsource-variable/inter": "^5.3.0",
-    "@shadcn/react": "^0.3.0",
     "@tailwindcss/vite": "^4",
     "@tanstack/react-devtools": "latest",
     "@tanstack/react-query": "^5.102.3",
@@ -26,15 +25,11 @@
     "axios": "^1.19.0",
     "class-variance-authority": "^0.7.1",
     "clsx": "^2.1.1",
-    "cmdk": "^1.1.1",
     "date-fns": "^4.4.0",
-    "embla-carousel-react": "^8.6.0",
-    "input-otp": "^1.5.0",
     "lucide-react": "^1.34.0",
     "react": "^19.2.6",
     "react-day-picker": "^10.0.1",
     "react-dom": "^19.2.6",
-    "react-resizable-panels": "^4.12.3",
     "recharts": "3.8.0",
     "shadcn": "^4.19.0",
     "tailwind-merge": "^3.6.0",