Reset execution state on unmount for Activity mode changes

[jmgraa]

Explanation of Change

Reset the native useSingleExecution state when the hook unmounts during Activity mode changes, allowing actions to execute again after a pending transition is canceled. Added a regression test for this behavior.

Fixed Issues

$ #99203
PROPOSAL:

Tests

1. Run the native useSingleExecution unit tests.
2. Verify the tests pass, including the Activity mode change regression test.

• Verify that no errors appear in the JS console

Offline tests

N/A

QA Steps

1. Share a photo from the gallery using the Share Extension.
2. Select a recipient.
3. Go back to the recipient selection screen.
4. Select a different recipient.
5. Verify the second recipient can be selected successfully and the app does not freeze.

• 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)
• I followed proper code patterns (see Reviewing the code)
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  • I verified that any new or modified comments were clear, correct English, and explained "why" the code was doing something instead of only explaining "what" the code was doing.
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  • A similar style doesn't already exist
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Screenshots/Videos

Android: Native

iOS: Native

[melvin-bot]

@shubham1206agra 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]

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Prevent stale async completions from unlocking newer executions

When an async action has already reached the transition callback, its execution.finally() remains active. If Activity then hides the hook, this cleanup resets the guard; after the Activity becomes visible, a second async action can start, but completion of the first action will still call setIsExecuting(false), prematurely enabling the pressable and allowing a third invocation while the second action is pending. Invalidate completion callbacks across this reset or associate them with an execution generation.

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