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🤖 ## Summary The web and desktop app (`buzz-app`) saves a "caught up" mark when you scroll to the bottom of a channel and stay there, and another one for a thread. Mobile did not understand these marks. It relied on the separate per-message read marks that `buzz-app` also kept. `buzz-app` is about to stop keeping those per-message marks under the "caught up" mark (block/buzz-app#590), to save space in the synced read state. With this change, mobile reads the "caught up" marks with the same rules as `buzz-app`: - `activity:<channel>` reads ordinary top-level messages up to its time. It does not read thread replies, mentions, broadcasts or DM messages, because reaching the bottom of the channel does not prove you saw those. - `thread-activity:<root>` reads the replies in that thread up to its time. So a message you read in `buzz-app` stays read on mobile: in the app badge, the channel list unread state, the "new messages" divider when you open a channel, and the Mark read / Mark unread action. Mobile does not write these marks. It only reads them. ### Related issue None found. Companion to block/buzz-app#590. The old desktop app in this repo is intentionally not changed. ### Testing - New badge tests: `activity:` clears an ordinary top-level message, and does not clear a mention, a thread reply or a DM. `thread-activity:` clears replies in its own thread only. The two "clears" tests fail without this change. - New tests for the per-message read check and the "ordinary message" rule. - `flutter analyze`, `dart format` check and the full mobile test suite pass locally. - Not yet exercised on a device. --------- Signed-off-by: Larry <627498bd4bd1f281a16431e3c6cce3b5c25b6692798c78672298aefbf2f8f8b5@buzz.block.builderlab.xyz> Co-authored-by: Larry <627498bd4bd1f281a16431e3c6cce3b5c25b6692798c78672298aefbf2f8f8b5@buzz.block.builderlab.xyz>