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90772a43e9
On a slow link, avatars in a channel could fail to appear entirely. Two causes: - **Duplicate downloads.** Each decode size is its own image-cache entry, so an avatar shown at two sizes (a message row and its reply summary) started two downloads of the same bytes, which then competed for bandwidth. The in-flight download is now shared per URL and auth service. - **Full-size avatars.** Avatars a few dozen points wide downloaded the original upload, which can be megabytes. The relay generates a JPEG thumbnail of at most 320px for every uploaded image, and desktop already loads it for small avatars. Mobile now does the same for any image format when an avatar is at most 240 physical pixels on each side. About 88% of relay-hosted avatars on the internal relay are PNG, with a median size of 337 KB. As on desktop, the thumbnail is a still JPEG: transparent areas render black and animation is lost. Rendered side by side, mobile and desktop look the same. If the relay returns 404 for a thumbnail (older or externally populated media), the avatar loads the original instead, as the notification extension's avatar loader already does. ### Before merge - [x] Kenny Lopez reviews the visible changes ([approved in Buzz #buzz-mobile](buzz://message?channel=9f18f3c6-b5e5-453d-b36d-65487913be0b&id=c8b01eaa3760e44c3b6583f2e02bec576d78679adfb364e5fe718cc0926bdc2d)). ### Validation On an iPhone SE (iOS 27.0.1) running a profile build, relay traffic went through a Mac-side proxy shaped to 200ms one-way latency, 240 kbps down and 200 kbps up. I opened a busy channel and logged each relay image fetch. Every fetch is aborted 30s after it starts, which [#8881](https://github.com/block/buzz/pull/8881) changes separately; with thumbnails the avatars below no longer come close to that limit. | Avatar | Before | After | | --- | --- | --- | | A | 1.45 MB, fetched twice; both aborted at 30s, never shown | 14.5 KB thumbnail, 3.6s | | B | aborted at 30s, never shown | 14.5 KB thumbnail, 4.1s | | C | 125 KB, fetched twice, 26s each | 21.5 KB thumbnail, 4.3s | | D | 46 KB, 11.1s | 24.7 KB thumbnail, 4.6s | Added tests (each fails without its fix): - One URL resolved at two decode sizes downloads once. - Small relay avatars request the thumbnail and large ones the original. - A thumbnail 404 falls back to the original, and other thumbnail failures show the avatar fallback. - The thumbnail URL is built only for relay-hosted blobs (`/media/<sha256>` with an optional extension), the same pattern desktop's `mediaUrl` uses. The full mobile suite passes. 🤖 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> Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>