fix(editor): centerize iframe modal in mobile (#13073)

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[BS-3160](https://linear.app/affine-design/issue/BS-3160/新的-embed-输入的-sheet-没有弹起来)

#### PR Dependency Tree


* **PR #13073** 👈

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 popup positioning and responsiveness when using virtual
keyboards, ensuring popups remain visible and correctly placed above the
keyboard.
* Standardized how popups and overlays are created and referenced
throughout the app, reducing inconsistencies and potential display
issues.
* Enhanced stability of date picker, AI panels, and slash menu popovers
by refining how their elements are managed and updated.

<!-- end of auto-generated comment: release notes by coderabbit.ai -->

blocksuite/affine/components/src/hover/controller.ts

@@ -179,7 +179,7 @@ export class HoverController implements ReactiveController {
       this._portal = createLitPortal({
         ...portalOptions,
         abortController: this._abortController,
-      });
+      }).portal;
 
       const transition = this._hoverOptions.transition;
       if (transition) {

blocksuite/affine/components/src/portal/helper.ts

@@ -161,7 +161,7 @@ export function createLitPortal({
   }
 
   if (!positionConfigOrFn) {
-    return portalRoot;
+    return { portal: portalRoot, update: () => {} };
   }
 
   const visibility = portalRoot.style.visibility;
@@ -221,5 +221,5 @@ export function createLitPortal({
     });
   }
 
-  return portalRoot;
+  return { portal: portalRoot, update };
 }