fix: correct port mapping in README docker examples (3030:3000), add v1.2.1 to changelog

README.md

@@ -54,7 +54,7 @@ Open `http://your-server:3030` in a browser on your tablet/screen.
 docker build -t frambe .
 docker run -d \
   --name frambe \
-  -p 3030:3030 \
+  -p 3030:3000 \
   -e IMMICH_URL=http://your-immich-server:2283 \
   -e IMMICH_API_KEY=your-api-key \
   --restart unless-stopped \
@@ -94,7 +94,7 @@ All settings are via environment variables:
 | `REFRESH_INTERVAL` | `300` | Seconds between source refresh checks (new photos) |
 | `ALBUM_ID` | *(empty)* | Auto-start with specific album (env-based) |
 | `SHOW_FAVORITES_ONLY` | `false` | Auto-start with favorites (env-based) |
-| `PORT` | `3030` | Server port |
+| `PORT` | `3000` | Internal server port (Docker maps externally via compose) |
 
 ## 🎮 Controls
 
@@ -130,6 +130,7 @@ The Node.js backend acts as a secure proxy — your Immich API key never reaches
 
 ## 📋 Version History
 
+- **1.2.1** — Fix port mapping (3030:3000 external:internal), fix URL param auto-launch not starting slideshow
 - **1.2.0** — URL params (`?album=`, `?person=`, `?favorites`, `?random`), person/face support, periodic auto-refresh, app icon, default port changed to 3030
 - **1.1.0** — Rebrand to Frambe
 - **1.0.0** — Initial release: album browser, slideshow with crossfade, clock/date/EXIF overlays, touch & keyboard controls, Docker deployment