Build admin Excel import review screen

[raggopaluni]

Description

After parsing admin reviews all items before publishing.

Page: /admin/imports/review

Shows summary banner, color-coded table (green/yellow/red), Approve All Green button, per-row approve/edit/skip.

Acceptance Criteria

• All items shown with color status
• Approve All Green works
• Individual approve/skip works
• Edit saves correctly
• Publish sends approved items to Supabase
• Failed items downloadable as report

Dependencies

Issue #24