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

packages/frontend/apps/ios/src/plugins/affine-theme/definitions.ts

@@ -0,0 +1,5 @@
+import type { NativeThemeMode } from './theme-mode';
+
+export interface AffineThemePlugin {
+  onThemeChanged(options: { themeMode: NativeThemeMode }): Promise<void>;
+}

packages/frontend/apps/ios/src/plugins/affine-theme/index.ts

@@ -0,0 +1,9 @@
+import { registerPlugin } from '@capacitor/core';
+
+import type { AffineThemePlugin } from './definitions';
+
+const AffineTheme = registerPlugin<AffineThemePlugin>('AffineTheme');
+
+export * from './definitions';
+export * from './theme-mode';
+export { AffineTheme };

packages/frontend/apps/ios/src/plugins/affine-theme/theme-mode.ts

@@ -0,0 +1 @@
+export type NativeThemeMode = 'dark' | 'light' | 'system';

packages/frontend/apps/ios/src/plugins/image-picker/definitions.ts

@@ -0,0 +1,13 @@
+export interface PickedImageFile {
+  path: string;
+  name: string;
+  mimeType: string;
+  lastModified: number;
+}
+
+export interface ImagePickerPlugin {
+  pickImages(options?: { multiple?: boolean }): Promise<{
+    files: PickedImageFile[];
+    canceled?: boolean;
+  }>;
+}

packages/frontend/apps/ios/src/plugins/image-picker/index.ts

@@ -0,0 +1,8 @@
+import { registerPlugin } from '@capacitor/core';
+
+import type { ImagePickerPlugin } from './definitions';
+
+const ImagePicker = registerPlugin<ImagePickerPlugin>('ImagePicker');
+
+export * from './definitions';
+export { ImagePicker };