feat(ios): add share to support (#15340)

<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit

* **New Features**
  * Added iOS sharing for URLs, text, web pages, and images.
* Shared content can be reviewed, titled, and saved to an AFFiNE
workspace.
  * Choose destinations including workspaces, tags, and collections.
* Added previews, attachment handling, import status, retry support, and
success/error feedback.
* Pending shares are processed when AFFiNE opens or returns to the
foreground.
* **Bug Fixes**
* Improved workspace profile handling across different workspace types.
* Onboarding completion is now recorded immediately after successful
sign-in verification.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->

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Co-authored-by: DarkSky <25152247+darkskygit@users.noreply.github.com>

packages/frontend/apps/ios/App/ShareExtension/SafariPageCapture.js

@@ -0,0 +1,14 @@
+var SafariPageCapture = function () {};
+
+SafariPageCapture.prototype = {
+  run: function (context) {
+    var selection = window.getSelection();
+    context.completionFunction({
+      title: document.title || '',
+      url: document.location.href,
+      selectedText: selection ? selection.toString() : '',
+    });
+  },
+};
+
+var ExtensionPreprocessingJS = new SafariPageCapture();