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## Summary - navigate across image occurrences that are currently rendered inside the nearest explicit open-thread DOM scope - preserve rendered DOM order, duplicate occurrence identity, hidden-spoiler exclusion, preview-image entry parity, and the exact thumbnail return target - keep adjacent timeline messages and unrelated surfaces as separate galleries - make Copy and Download follow the current gallery item, including when a link-preview image opens the gallery first and navigation reaches Markdown media ## Scope contract This is intentionally a **rendered-media gallery only**. Gallery membership comes from mounted image triggers under the nearest explicit thread scope. Collapsed or unloaded descendants are excluded until the thread UI renders them. There is no canonical thread fetch, descendant projection, depth override, or synchronous message reparse in this change. `ChannelPane.tsx` remains unchanged from `main`; `useSearchHighlightProps` and both timeline/thread prop spreads are preserved. ## Verification - rebased onto `origin/main` at `113a33b7e49b7173ee1767c49ef2f49c63803034` - `git diff --check` - differential file-size check - full Desktop check (Biome plus text/pubkey policy checks; only pre-existing informational diagnostics) - Desktop TypeScript typecheck - Desktop production build and rebuilt E2E build - full Desktop JS units: `5,476/5,476` passed - full Desktop Tauri workspace tests passed (one documented native performance test ignored) - rebuilt image gallery Playwright spec: `14/14` passed - search-highlight smoke cases: `5/5` passed - reduced diff: 6 files, `+417/-41`; production `+78/-41`, E2E `+339/-0` The four added E2E cases cover cross-message thread navigation and return targeting, rendered-only exclusion of collapsed descendants, preview-first current-item actions, and adjacent-message isolation. --------- Signed-off-by: Kalvin Chau <kalvin@block.xyz> Signed-off-by: am <6e30cd56c30e030cd31bb0939b94a7c257c9a09d5ba2d92cf2735da45629f248@buzz.block.builderlab.xyz> Co-authored-by: am <6e30cd56c30e030cd31bb0939b94a7c257c9a09d5ba2d92cf2735da45629f248@buzz.block.builderlab.xyz>