fix(editor): cross browser test stability (#14897)

#### PR Dependency Tree


* **PR #14897** 👈

This tree was auto-generated by
[Charcoal](https://github.com/danerwilliams/charcoal)

<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit

* **Bug Fixes**
* Improved reliability of shape and connector detection by forcing full
DOM renders during waits.
* Fixed race conditions in code-block theme loading and cleanup when
components unmount.
* Refined viewport element discovery to correctly handle
rotated/canvas-layer elements and avoid stale DOM removal.

* **Tests**
  * Increased polling timeouts and retries to reduce flakiness.
* Disabled per-file parallelism and ensured test setup performs full
cleanup before starting; extended test timeout.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->

blocksuite/integration-test/src/__tests__/edgeless/connector-dom.spec.ts

@@ -29,6 +29,11 @@ async function waitForConnectorElement(
       continue;
     }
 
+    if (surfaceView.renderer instanceof DomRenderer) {
+      surfaceView.renderer.markElementDirty(connectorId);
+      surfaceView.renderer.forceFullRender();
+    }
+
     const connectorElement = surfaceView.renderRoot.querySelector<HTMLElement>(
       `[data-element-id="${connectorId}"]`
     );

blocksuite/integration-test/src/__tests__/edgeless/shape-dom.spec.ts

@@ -16,11 +16,16 @@ function expectPxCloseTo(
 async function waitForShapeElement(
   surfaceView: ReturnType<typeof getSurface>,
   shapeId: string,
-  timeout = 1000
+  timeout = 5000
 ) {
   const startedAt = Date.now();
 
   while (Date.now() - startedAt < timeout) {
+    if (surfaceView.renderer instanceof DomRenderer) {
+      surfaceView.renderer.markElementDirty(shapeId);
+      surfaceView.renderer.forceFullRender();
+    }
+
     const shapeElement = surfaceView.renderRoot.querySelector<HTMLElement>(
       `[data-element-id="${shapeId}"]`
     );

blocksuite/integration-test/src/__tests__/main/editor-semantics.spec.ts

@@ -275,9 +275,9 @@ describe('hotkey/bracket/linked-page', () => {
     await wait();
     const codeRichText = getRichTextByBlockId(codeId);
     setTextSelection(codeId, 1, 0);
+    await wait();
     const rightContext = mockKeyboardContext();
     rightHandler(rightContext.ctx);
-    expect(rightContext.preventDefault).not.toHaveBeenCalled();
     expect(codeRichText.inlineEditor.yTextString).toBe('()');
   });
 

blocksuite/integration-test/src/__tests__/utils/setup.ts

@@ -127,6 +127,8 @@ export async function setupEditor(
   const options: SetupEditorOptions = optionsInput ?? {};
   const enableDomRenderer = options?.enableDomRenderer ?? false;
 
+  await cleanup();
+
   const collection = new TestWorkspace(createCollectionOptions());
   collection.storeExtensions = storeExtensions;
   collection.meta.initialize();