fix(photo-addon): add referrer policy for OSM map tiles

[paul43210]

Summary

• OSM tile servers require a Referer header, but oCIS may set a strict Referrer-Policy that strips it
• Injects <meta name="referrer" content="no-referrer-when-downgrade"> when the map initializes (restored on unmount)
• Sets referrerPolicy on each tile <img> element via custom TileLayer
• Failed tiles automatically retry once after 500ms

Test plan

• Open map view — verify no 403 errors on OSM tiles
• Pan and zoom the map — verify all tiles load correctly
• Switch away from map view and back — verify tiles still load

🤖 Generated with Claude Code

[mmattel]

failing tests: typecheck

+ pnpm check:types

web-extensions@ check:types /drone/src
pnpm -r check:types

Scope: 9 of 10 workspace projects
packages/web-app-advanced-search check:types$ vue-tsc --noEmit
packages/web-app-cast check:types$ vue-tsc --noEmit
packages/web-app-draw-io check:types$ vue-tsc --noEmit
packages/web-app-importer check:types$ vue-tsc --noEmit
packages/web-app-cast check:types: Done
packages/web-app-json-viewer check:types$ vue-tsc --noEmit
packages/web-app-importer check:types: Done
packages/web-app-photo-addon check:types$ vue-tsc --noEmit
packages/web-app-draw-io check:types: Done
packages/web-app-progress-bars check:types$ vue-tsc --noEmit
packages/web-app-advanced-search check:types: Done
packages/web-app-unzip check:types$ vue-tsc --noEmit
packages/web-app-json-viewer check:types: Done
packages/web-app-progress-bars check:types: Done
packages/web-app-photo-addon check:types: src/components/PhotoMap.vue(492,42): error TS2445: Property 'createTile' is protected and only accessible within class 'GridLayer' and its subclasses.
packages/web-app-photo-addon check:types: src/components/PhotoMap.vue(505,20): error TS2554: Expected 0 arguments, but got 2.
packages/web-app-unzip check:types: Done
packages/web-app-photo-addon check:types: Failed
/drone/src/packages/web-app-photo-addon:
 ERR_PNPM_RECURSIVE_RUN_FIRST_FAIL  photo-addon@0.2.0 check:types: vue-tsc --noEmit
Exit status 2
 ELIFECYCLE  Command failed with exit code 2.

[paul43210]

Fixed the TypeScript errors — replaced L.TileLayer.extend() (which accessed the protected createTile method) with Leaflet's event-based approach using tileloadstart and tileerror events. Same functionality, clean types.