fix(ios): stabilize keyboard toolbar, image picker, and scrolling (#15182)

## Summary
- keep the editor active when iOS keyboard toolbar interactions move
focus into range-sync excluded widgets
- use the native iOS image picker/source sheet and sync native
presentation with the app theme
- pin `ListViewKit` to `1.1.6` so the iOS workspace resolves with Xcode
16.3
- restore vertical scrolling in the iOS `WKWebView` by removing the
global `contentOffset` reset while preserving zoom prevention

## Test plan
- [x] `yarn vitest --run --config \"vitest.config.ts\"
--browser.enabled=false \"src/__tests__/inline/active.unit.spec.ts\"`
- [x] `LANG=en_US.UTF-8 LC_ALL=en_US.UTF-8 xcodebuild
-resolvePackageDependencies -workspace
\"packages/frontend/apps/ios/App/App.xcworkspace\" -scheme \"App\"`
- [x] `xcodebuild -workspace \"App.xcworkspace\" -scheme \"App\"
-destination \"generic/platform=iOS Simulator\" build
CODE_SIGNING_ALLOWED=NO ONLY_ACTIVE_ARCH=YES ARCHS=arm64`
- [x] Xcode build validation for the updated PR branch

blocksuite/affine/shared/src/__tests__/utils/file.native-image-picker.unit.spec.ts

@@ -0,0 +1,79 @@
+import { afterEach, beforeEach, describe, expect, it, vi } from 'vitest';
+
+import {
+  getImageFilesFromLocal,
+  registerNativeImageFilesPicker,
+} from '../../utils';
+
+describe('getImageFilesFromLocal', () => {
+  let originalShowPicker: ((this: HTMLInputElement) => void) | undefined;
+
+  beforeEach(() => {
+    originalShowPicker = (
+      HTMLInputElement.prototype as HTMLInputElement & {
+        showPicker?: (this: HTMLInputElement) => void;
+      }
+    ).showPicker;
+
+    (
+      HTMLInputElement.prototype as HTMLInputElement & {
+        showPicker?: (this: HTMLInputElement) => void;
+      }
+    ).showPicker = vi.fn(function (this: HTMLInputElement) {
+      this.dispatchEvent(new Event('cancel'));
+    });
+  });
+
+  afterEach(() => {
+    if (originalShowPicker) {
+      (
+        HTMLInputElement.prototype as HTMLInputElement & {
+          showPicker?: (this: HTMLInputElement) => void;
+        }
+      ).showPicker = originalShowPicker;
+    } else {
+      delete (
+        HTMLInputElement.prototype as unknown as {
+          showPicker?: unknown;
+        }
+      ).showPicker;
+    }
+
+    registerNativeImageFilesPicker(null);
+    vi.restoreAllMocks();
+  });
+
+  it('prefers the registered native image picker when available', async () => {
+    const file = new File(['picked-image'], 'picked.png', {
+      type: 'image/png',
+      lastModified: 123,
+    });
+    const nativePicker = vi.fn(async () => [file]);
+    registerNativeImageFilesPicker(nativePicker);
+
+    const files = await getImageFilesFromLocal();
+
+    expect(nativePicker).toHaveBeenCalledTimes(1);
+    expect(files).toEqual([file]);
+  });
+
+  it('falls back to the standard picker when the native picker rejects', async () => {
+    vi.spyOn(console, 'error').mockImplementation(() => {});
+    const nativePicker = vi.fn(async () => {
+      throw new Error('Native picker failed');
+    });
+    registerNativeImageFilesPicker(nativePicker);
+
+    const files = await getImageFilesFromLocal();
+
+    expect(nativePicker).toHaveBeenCalledTimes(1);
+    expect(files).toEqual([]);
+    expect(
+      (
+        HTMLInputElement.prototype as HTMLInputElement & {
+          showPicker?: (this: HTMLInputElement) => void;
+        }
+      ).showPicker
+    ).toHaveBeenCalledTimes(1);
+  });
+});