perf(homepage): optimize responsive images and reserve media dimensions [Codex] - #1366
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Generate AVIF and WebP candidates at build time, preserve intrinsic dimensions across homepage media, and defer below-fold images and video data. Cover candidate delivery, responsive selection, gallery behavior, and reserved layout without adding effects.
Verify dimensions, AVIF/WebP candidates, responsive selection, and layout reservation before image responses at both viewports. Addresses PR #1355 comment 4054821928.
Keep the responsive media component out of app/routes because it is not registered with React Router.
Preserve responsive image, media dimension, asset format, and reserved-layout coverage through typed browser bindings.
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This layer of #1354 replaces fixed-size homepage photos and screenshots with build-generated AVIF/WebP candidates. The Vite plugin and core package are development dependencies; a small native picture/img component consumes their metadata without adding the responsive-image React runtime or any effects. Original public asset URLs remain available.
All 63 homepage images and three videos now declare dimensions. Gallery source sizes account for its fixed-height crop, SVG logo ratios preserve the existing layout, and native videos keep controls and posters while using preload="none".
At DPR 1, the three displayed responsive images fall from 134,130 bytes to 53,353 on desktop and 42,687 on mobile. The production asset report records the tradeoff: JavaScript gzip grows from 143,792 to 145,858 bytes, CSS gzip from 13,086 to 13,099 bytes, and DOM elements from 409 to 415 for the three picture/source pairs. Missing image and video dimension counts are now zero.
Builds on #1365.