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/framework/std/src/inline/range/active.ts

@@ -1,4 +1,46 @@
-import { RANGE_SYNC_EXCLUDE_ATTR } from './consts';
+import { RANGE_SYNC_EXCLUDE_ATTR } from './consts.js';
+
+function getClosestElement(target: EventTarget | null) {
+  if (target instanceof Element) {
+    return target;
+  }
+
+  if (target instanceof Node) {
+    return target.parentElement;
+  }
+
+  return null;
+}
+
+export function isRangeSyncExcludedTarget(target: EventTarget | null) {
+  return !!getClosestElement(target)?.closest(
+    `[${RANGE_SYNC_EXCLUDE_ATTR}="true"]`
+  );
+}
+
+export function shouldDeactivateEditorOnFocusOut(
+  editorHost: HTMLElement,
+  relatedTarget: EventTarget | null
+) {
+  // A missing or non-DOM `relatedTarget` means focus is not moving to a
+  // trackable element (e.g. block-level selection or a keyboard action). The
+  // document `focusout` handler must keep the editor active in this case so the
+  // current block selection is preserved; leaving-to-nowhere is handled
+  // explicitly by the host `blur` handler instead.
+  if (!relatedTarget || !(relatedTarget instanceof Node)) {
+    return false;
+  }
+
+  if (editorHost.contains(relatedTarget)) {
+    return false;
+  }
+
+  if (isRangeSyncExcludedTarget(relatedTarget)) {
+    return false;
+  }
+
+  return true;
+}
 
 /**
  * Check if the active element is in the editor host.
@@ -11,8 +53,7 @@ export function isActiveInEditor(editorHost: HTMLElement) {
   const currentActiveElement = document.activeElement;
   if (!currentActiveElement) return false;
   // The input or textarea in the widget should be ignored.
-  if (currentActiveElement.closest(`[${RANGE_SYNC_EXCLUDE_ATTR}="true"]`))
-    return false;
+  if (isRangeSyncExcludedTarget(currentActiveElement)) return false;
   const currentEditorHost = currentActiveElement?.closest('editor-host');
   if (!currentEditorHost) return false;
   return currentEditorHost === editorHost;