[shlok2721-web]

Summary

Fixes the Save Changes dialog's backdrop layering and dismissal behavior.

Changes

• Dimmed backdrop: Adds a translucent backdrop behind the Save Changes dialog to visually distinguish it from the underlying application.
• Click-outside dismissal: Allows clicking outside the dialog to dismiss the prompt.
• Correct dialog layering: Ensures the Save Changes dialog and its buttons remain above the backdrop, so button clicks are handled correctly.
• Regression test: Adds UI coverage verifying that clicking Save closes the prompt and writes the modified document to disk.
• CI workflow: Updates the Linux build workflow to run relevant tests and improve build caching.

Testing

• Built and manually tested the application; the affected behavior works as expected.
• Added an automated regression test for the Save Changes button and document persistence.

Closes #1597

[fluorine]

Issue #1597 is closed, and merged PR #1602 closed it. This PR may now be unnecessary. Please check whether main already has this change. If it does, please close this PR. If something is still missing, say what here.

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