CONV-079: Add drag hover upload UI

[menvil]

Visual Alpine.js drag-over highlighting for upload dropzone.

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Summary by cubic

Adds Alpine.js drag-over highlighting to the upload dropzone in the dashboard converter, addressing Linear CONV-079. The dropzone now switches to primary border/background on drag enter/over and reverts on leave/drop with a smooth color transition.

^{Written for commit ca254bf. Summary will update on new commits.}

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