feat: add backend sticker message relay and fix frontend handler

- Add stickers.setMode and stickers.mode handlers to WebSocket manager
  so messages relay between frontend and vote-app via session broadcast
- Fix frontend to read message.data.mode (matching broadcastEvent format)
- Bump version to 0.8.1

Co-authored-by: Cursor <cursoragent@cursor.com>

frontend/src/config/branding.js

@@ -2,7 +2,7 @@ export const branding = {
   app: {
     name: 'HSO Jackbox Game Picker',
     shortName: 'Jackbox Game Picker',
-    version: '0.8.0 - Stickers That Stick Edition',
+    version: '0.8.1 - Stickers That Stick Edition',
     description: 'Spicing up Hyper Spaceout game nights!',
   },
   meta: {

frontend/src/pages/Picker.jsx

@@ -1534,7 +1534,7 @@ function SessionInfo({ sessionId, onGamesUpdate, playingGame, setPlayingGame, se
           }
 
           if (message.type === 'stickers.mode') {
-            setStickerMode(message.mode);
+            setStickerMode(message.data.mode);
             return;
           }