Merge visual review into full shell and preserve bilingual layout

frontend/src/shell/AppShell.session-mgmt.test.tsx

@@ -36,13 +36,21 @@ const resumeResult = (id: string, alreadyActive = false) =>
 
 class ControlledResizeObserver {
   static instances: ControlledResizeObserver[] = [];
+  private targets = new Set<Element>();
   constructor(private readonly callback: ResizeObserverCallback) {
     ControlledResizeObserver.instances.push(this);
   }
-  observe = vi.fn();
-  disconnect = vi.fn();
+  observe = vi.fn((target: Element) => { this.targets.add(target); });
+  disconnect = vi.fn(() => { this.targets.clear(); });
   trigger() {
-    this.callback([], this as unknown as ResizeObserver);
+    const entries: ResizeObserverEntry[] = [...this.targets].map(target => ({
+      target,
+      contentRect: new DOMRect(0, 0, target.clientWidth, target.clientHeight),
+      borderBoxSize: [],
+      contentBoxSize: [],
+      devicePixelContentBoxSize: [],
+    }));
+    if (entries.length) this.callback(entries, this as unknown as ResizeObserver);
   }
 }