a85de793d73b6951ccc0cf48750b4eb89982320e
Added validation to prevent users from submitting the upload form without selecting a file first. The preview button is now disabled by default and only enables when a file is selected, improving user experience and preventing empty form submissions. Changes: - Added IDs to file input and preview button - Button starts in disabled state - JavaScript listener enables button when file is selected - Button disables again if file selection is cleared
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