feat(spa): sync host/player hash phase routes during gameplay

frontend/angular/src/app/features/player/player-shell.component.ts

@@ -296,6 +296,25 @@ export class PlayerShellComponent implements OnInit, OnDestroy {
     });
   }
 
+  private syncRouteFromSession(): void {
+    if (!this.session) {
+      return;
+    }
+
+    const phase = this.session.session.status || 'lobby';
+    const code = this.normalizeCode(this.session.session.code || this.sessionCode);
+    if (!code) {
+      return;
+    }
+
+    const targetPath = `#/player/${encodeURIComponent(phase)}/${encodeURIComponent(code)}`;
+    if (typeof window === 'undefined' || window.location.hash === targetPath) {
+      return;
+    }
+
+    window.history.replaceState(window.history.state, '', targetPath);
+  }
+
   private async request<T>(path: string, method: 'GET' | 'POST', payload?: unknown): Promise<T> {
     const response = await fetch(path, {
       method,
@@ -330,6 +349,7 @@ export class PlayerShellComponent implements OnInit, OnDestroy {
         this.selectedGuess = '';
       }
       this.syncFinalLeaderboard();
+      this.syncRouteFromSession();
       this.markOnline();
     } catch (error) {
       this.error = `Session refresh failed: ${this.toMessage(error)}`;
@@ -359,6 +379,7 @@ export class PlayerShellComponent implements OnInit, OnDestroy {
         this.selectedGuess = '';
       }
       this.syncFinalLeaderboard();
+      this.syncRouteFromSession();
       this.markOnline();
     } catch (error) {
       this.error = `Join failed: ${this.toMessage(error)}`;