Polish the fault-record transfer window

[masarray]

Visual polish

• compact 940×650 layout
• move Scan fault records into the header and remove the remote-directory input
• remove the remote-directory grid column
• apply soft-gradient pill styling to every button
• vertically center all grid cells and text
• keep the records grid, row backgrounds, selection highlights, and status indicators strictly square with no rounded edges
• replace the status text cell with a clean rectangular accent indicator

Smart workflow

• detect previously downloaded records from the selected local folder on every scan and folder change
• validate all expected companion filenames and known sizes
• mark completed local records with a green square-row highlight
• mark incomplete local sets with an amber square-row highlight
• disable selection for records already downloaded, preventing accidental duplicates
• retain detection across application restarts because the local filesystem is the source of truth

Feedback

• add a soft-gradient, auto-hiding toast for download success, failure, cancellation, and folder changes
• preserve the expandable transfer diagnostics only for actual failures

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