feat(05-04): route strings (10 keys en+ms) + @araharah/routing workspace dep (GREEN)

- 10 ShellStrings keys per the binding UI-SPEC copy table (routeRegister,
  routeDiffFastest/Slower templates, pending card quartet, ctaSearchAgain,
  ariaRouteAlternatives/Chip templates) — verbatim en + ms
- copy gate: COPY1 floor 40 + route-key pins, COPY5 scans web/src/route,
  COPY7 pins the verbatim pending/CTA/template copy
- web depends on @araharah/routing (lockfile settled)

web/package.json

@@ -13,7 +13,8 @@
   "dependencies": {
     "maplibre-gl": "^6.15.0",
     "@araharah/theme": "*",
-    "@araharah/search": "*"
+    "@araharah/search": "*",
+    "@araharah/routing": "*"
   },
   "devDependencies": {
     "vite": "^8.3.5",