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## Summary The opt-in iOS zoom gallery rejected PNG and HEIC/HEIF photos, so photo stacks containing those files opened the Flutter fallback. Accept these formats by MIME type or file extension, including uppercase extensions and URLs with query strings. Preserve animated PNG playback by forwarding continuing decoded frames to the selected native page. Keep the existing five-photo load window, coalesce frames while the bridge is busy, skip offscreen frame encoding, and release listeners on eviction or dismissal. Native updates reject stale sessions, offscreen pages, malformed frames, and closed viewers. `BUZZ_NATIVE_PHOTO_ZOOM` remains opt-in. iOS below 18 and unsupported formats retain the existing gallery. ### Related issue Follow-up to #9259. No matching open issue or PR found; #7666 concerns desktop HEIC upload tiling, a separate path. ### Testing - `just mobile-install mobile-check mobile-test` passed. - Full mobile suite with `BUZZ_NATIVE_PHOTO_ZOOM=true`: 4,623 passed, 68 skipped. Standard configuration: 4,599 passed, 92 skipped; push configuration and secp256k1 package tests also passed. - Real PNG and HEIC decoding through the production presentation bridge; real two-frame APNG decoding with continuing-frame and listener-cleanup assertions. - `scripts/test-mobile-photo-zoom.sh` on an iOS 27 simulator exercises the production native controller, including frame updates, stale-page rejection, malformed input and teardown. No physical-device or end-to-end zoom recording captured. This extends accepted image formats and playback without changing the gallery layout. --------- Signed-off-by: kenny lopez <klopez4212@gmail.com> Co-authored-by: Terp <5856f6900e8e0a4e0ea1f4f8d2ee33e4753d2119bc122f94ecafc660b46c0511@buzz.block.builderlab.xyz>