AJ a85de793d7 Feature: disable preview button until CSV file is selected
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
2025-11-16 12:07:17 -05:00
2025-10-04 02:19:54 -04:00
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