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Safari/iOS browsers lack Widevine EME support, so DRM videos couldn't play. This adds a server-side decrypt-and-stream pipeline that reuses the existing downloadDrmMedia() code to decrypt videos on demand, cache them, and serve plain MP4s with Range support for native <video> playback. - server/drm-stream.js: new router with decrypt, status, and serve endpoints - client/src/components/ServerDrmVideo.jsx: decrypt→poll→play lifecycle component - DrmVideo.jsx: Widevine detection, falls back to ServerDrmVideo for Safari - MediaGrid.jsx: passes raw mpdUrl through to DrmVideo Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>