Implement "Open" action for embedded file attachments
This MR adds an "Open" action to the context menu for embedded file attachments (specifically `FileAttachment` annotations). Previously, the context menu only offered a "Save" option, forcing user to save the fle to disk before viewing it.
Implementation Details:
The new action extracts the embedded file to a temporary file using QTemporaryFile to ensure unique naming while preserving the correct file extension)
and opens it using QDesktopServices::openUrl() (letting the OS decide the correct application).
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