fix: chat PlayerName fallback + nouveau build WebGL 20260517b

- ChatUI: PlayerName utilise PlayerPrefs comme fallback si non connecte
- NetworkManager: sauvegarde le nom dans PlayerPrefs a la connexion
- GameCanvas: version build bump -> 20260517b (cache bust)
- Nouveaux fichiers build_mai (data + wasm mis a jour)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

game/Assets/Scripts/Stats.meta

@@ -0,0 +1,8 @@
+fileFormatVersion: 2
+guid: e9c4c0760bb30024293b8152d79c595e
+folderAsset: yes
+DefaultImporter:
+  externalObjects: {}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: