Require PNG images for App Stories previews - #2959
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Refresh Reviu with three PNG screenshots and an English product README, preserving its Featured placement. Move Longbridge Lite to position 12, between Cadence and Orrery, based on Showcase submission chronology. Standardize all catalog images on PNG. Thirteen existing JPEG, WebP, and AVIF images were converted once without resizing or cropping, and references now use PNG filenames. No conversion script or automatic conversion is included. CI only validates image file types using filenames and PNG signatures, including README images and video posters. Validation: 22 catalog tests passed and all 39 apps validated. The one-time conversion preserved decoded pixel data. Website loader enforcement is tracked separately in longbridge/gpui-kit#2959; merge this catalog migration first.
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Require PNG filenames and PNG file signatures for App Stories previews, matching the catalog image policy. Reject other formats and mislabeled files. No image conversion code is included.
Merge longbridge/gpui-kit-showcases#5 first, which migrates existing images to PNG.
Validation: App Stories tests passed, including non-PNG rejection and signature checks.