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Video messages without a NIP-71 poster (older events, or uploads where poster generation failed) used to start a network `VideoPlayerController` for each bubble, seek to 100 ms and show that paused frame. Nothing cached the frame, and the decoder was disposed whenever the bubble left the tree, so every scroll back opened a new stream and decoded again. Those bubbles now show the existing static "Video attachment" placeholder with the play button. Nothing loads until the user taps, and the full-screen viewer behaves as before. Videos that have a poster are unchanged. ### Validation - Full mobile Flutter test suite passes, and `flutter analyze` is clean. - The change is almost pure deletion: the frame loader, its provider and test seam, and the tests that covered it are removed. - Limitation: no simulator run. A cloned golden sim built from this branch signed in to the internal community, but its channel list never finished loading, so I couldn't open a channel with a posterless video. buzz-review-completed 🤖 Generated with [Claude Code](https://claude.com/claude-code) --------- Signed-off-by: Tom Brow <tomb@squareup.com> Co-authored-by: Tom Brow <tomb@squareup.com>