[WIP] Fix iOS share extension for screenshot preview sharing

[grgia]

Explanation of Change

When sharing a screenshot directly from the iOS screenshot preview thumbnail (the thumbnail that appears after taking a screenshot), iOS provides the image via object-based NSItemProviderWriting registration with specific types (e.g. public.png). The share extension's loadData method was requesting the generic "public.data" type identifier, which could fail for these providers because the type coercion from an object-based registration to the generic data type doesn't always succeed.

This PR makes three fixes:

1. Three-layer loading strategy in loadData: URLs load via UTType.url, images load via UTType.image (handles UIImage, Data, and URL results), and a generic fallback uses registeredTypeIdentifiers.first — the provider's own registered type — which is guaranteed to match.

2. Data handler in handleData: Raw byte data (e.g. PNG bytes) is now handled by attempting UIImage conversion, with a fallback to saving as a generic file.

3. handleStringData completion bug: Previously, file://-prefixed strings were silently dropped without calling completion(), which caused the DispatchGroup to hang and openMainApp() to never execute. Now file:// strings are properly converted to NSURL and processed through handleURLData.

Supersedes #84387, which tried four different approaches that all failed on physical devices.

Fixed Issues

$ https://github.com/Expensify/Expensify/issues/606736

Tests

1. On iPhone, take a screenshot
2. Tap the screenshot preview thumbnail in the bottom-left corner
3. Tap "Share", then select "Expensify"
4. Verify the "Share to Expensify" page appears and the image is loaded
5. Share a photo from the Photos app → Share → Expensify → verify it still works
6. Share a URL from Safari → Share → Expensify → verify it still works
7. Share text from Notes → Share → Expensify → verify it still works

• Verify that no errors appear in the JS console

Offline tests

N/A — the share extension operates on local data before opening the app.

QA Steps

1. On iPhone, take a screenshot
2. Tap the screenshot preview thumbnail in the bottom-left corner
3. Tap "Share", then select "Expensify"
4. Verify the "Share to Expensify" page appears and the image is loaded
5. Share a photo from Photos app → Share → Expensify → verify it still works
6. Share a URL from Safari → verify it still works

• Verify that no errors appear in the JS console

PR Author Checklist

• I linked the correct issue in the ### Fixed Issues section above
• I wrote clear testing steps that cover the changes made in this PR
  • I added steps for local testing in the Tests section
  • I added steps for the expected offline behavior in the Offline steps section
  • I added steps for Staging and/or Production testing in the QA steps section
  • I added steps to cover failure scenarios (i.e. verify an input displays the correct error message if the entered data is not correct)
  • I turned off my network connection and tested it while offline to ensure it matches the expected behavior (i.e. verify the default avatar icon is displayed if app is offline)
  • I tested this PR with a High Traffic account against the staging or production API to ensure there are no regressions (e.g. long loading states that impact usability).
• I included screenshots or videos for tests on all platforms
• I ran the tests on all platforms & verified they passed on:
  • Android: Native
  • Android: mWeb Chrome
  • iOS: Native
  • iOS: mWeb Safari
  • MacOS: Chrome / Safari
• I verified there are no console errors (if there's a console error not related to the PR, report it or open an issue for it to be fixed)
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• I added unit tests for any new feature or bug fix in this PR to help automatically prevent regressions in this user flow.
• If the main branch was merged into this PR after a review, I tested again and verified the outcome was still expected according to the Test steps.

Screenshots/Videos

Android: Native

N/A — iOS-only change

Android: mWeb Chrome

N/A — iOS-only change

iOS: Native

Requires manual testing on a physical iOS device with the share extension.

iOS: mWeb Safari

N/A — iOS-only change

MacOS: Chrome / Safari

N/A — iOS-only change

[melvin-bot]

@jjcoffee Please copy/paste the Reviewer Checklist from here into a new comment on this PR and complete it. If you have the K2 extension, you can simply click: [this button]

[github-actions]

🚧 @grgia has triggered a test Expensify/App build. You can view the workflow run here.

[grgia]

@jjcoffee you can ignore this for now, im testing something

[github-actions]

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