Will Miao 818b9113f0 fix(preview): add Cache-Control header to FileResponse for browser caching (#975) ...

Chrome does not cache 206 Partial Content responses for <video> elements
without an explicit Cache-Control header. When VirtualScroller recycles
cards and creates new <video> elements with the same URL, Chrome
re-downloads the full video (several MB each) instead of using the cache.

Verified via Chrome DevTools: same .mp4 URL appears 2-3 times in network
trace as separate requests with no cache hit, each returning 206. With
Cache-Control: max-age=86400, the browser will reuse the cached response
for 24 hours across scroll cycles.

Video preview files are ~3.5MB while image previews are ~50-100KB (due
to WebP optimization), making caching especially impactful for videos.

2026-06-14 17:36:59 +08:00

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