refactor(editor): always show keyboard toolbar in mobile (#13384)

Close
[AF-2756](https://linear.app/affine-design/issue/AF-2756/激活输入区的时候，展示toolbar，适配不弹虚拟键盘的场景，比如实体键盘)

#### PR Dependency Tree


* **PR #13384** 👈

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

* **New Features**
* Improved virtual keyboard handling by introducing static keyboard
height and app tab safe area tracking for more consistent toolbar
behavior.

* **Bug Fixes**
* Enhanced keyboard visibility detection on Android and iOS, especially
when a physical keyboard is connected.

* **Refactor**
* Simplified and streamlined keyboard toolbar logic, including delayed
panel closing and refined height calculations.
* Removed unused or redundant toolbar closing methods and position
management logic.

* **Style**
* Updated toolbar and panel styles for better positioning and layout
consistency.
  * Adjusted and removed certain mobile-specific padding styles.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->


#### PR Dependency Tree


* **PR #13384** 👈

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

blocksuite/affine/widgets/keyboard-toolbar/src/widget.ts

@@ -20,18 +20,6 @@ import {
 export const AFFINE_KEYBOARD_TOOLBAR_WIDGET = 'affine-keyboard-toolbar-widget';
 
 export class AffineKeyboardToolbarWidget extends WidgetComponent<RootBlockModel> {
-  private readonly _close = (blur: boolean) => {
-    if (blur) {
-      if (document.activeElement === this._docTitle?.inlineEditorContainer) {
-        this._docTitle?.inlineEditor?.setInlineRange(null);
-        this._docTitle?.inlineEditor?.eventSource?.blur();
-      } else if (document.activeElement === this.block?.rootComponent) {
-        this.std.selection.clear();
-      }
-    }
-    this._show$.value = false;
-  };
-
   private readonly _show$ = signal(false);
 
   private _initialInputMode: string = '';
@@ -129,7 +117,6 @@ export class AffineKeyboardToolbarWidget extends WidgetComponent<RootBlockModel>
         .keyboard=${this.keyboard}
         .config=${this.config}
         .rootComponent=${this.block.rootComponent}
-        .close=${this._close}
       ></affine-keyboard-toolbar>`}
     ></blocksuite-portal>`;
   }