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## Summary - Let Markdown tables use the available message width instead of their maximum-content width, inheriting the renderer's existing `wrap-anywhere` handling for long tokens and links. - Top-align header cells as well as body cells. Give cells a `min-w-24` readability floor so short labels do not collapse into one-letter columns; retain the existing table-local scrollbar when many columns genuinely cannot fit. - Preserve semantic table markup, links, inline code, and surrounding message layout. Add three browser regressions through the real message renderer (channel, narrow thread, and many-column overflow). ### Related issue Fixes #5313. No matching open table-readability PR found. Owner-authorized task channel: `819b36d5-7371-4ed0-bf9b-d461d723779e` Source: buzz://message?channel=819b36d5-7371-4ed0-bf9b-d461d723779e&id=3bf2d1bd5df28fcb481e71159dc1be2b3888918b05f67e270354fbfea65a8c90 ### Testing Original production candidate: `4427f2e6f9ef85a01a267fe9eabd1cf13cacfb78`; base: `7a9a5233d9d755e715be0c585cf7850e935d28cf`. - `pnpm -C desktop check` — passed. - `pnpm -C desktop test` — 6,110 passed, none skipped. - `pnpm -C desktop typecheck` — passed. - `BUZZ_PROTECTED_BUILD_OUTPUT=<isolated-production-directory> pnpm -C desktop build` — passed. - `pnpm -C desktop build:e2e --outDir <isolated-candidate-directory>` — passed. - `just file-size-check` and `git diff --check` — passed. - Chromium / mock Tauri bridge: all 3 new Playwright tests passed against the fixed candidate build. Both wrapping tests fail on the unchanged base build, while the overflow-fallback test passes. Each browser run used a unique output directory and a non-reused local server pinned to its build directory. - At 883px channel message width: table scroll width **1,395 → 883px**. At 292px thread message width: **1,395 → 292px**. All cells top-aligned; long tokens/URLs wrap, link destinations and code text remain intact, short labels stay on one line, and document width remains 1,280px. - Focused fresh-frame review checked actual before/after screenshots and the complete diff. It caught one-letter label wrapping in an early width-only candidate; the final cell-width floor and regression assertion address that finding. Limitations: native Tauri/WebKit and relay-backed integration were not exercised for this CSS-only delta. Repository-wide `just ci` was attempted but exceeded the local command budget during unrelated Rust compilation; it is **not** reported green. The full affected TypeScript package gates above passed on the exact candidate. Production/E2E builds retain existing chunk-size and mixed static/dynamic import warnings. Before/after screenshots are posted below using the repository's screenshot publication script. No merge, production installation, or runtime restart is requested. ### CI-driven test-only follow-up Current head: `925d964b6cf31ba704d74baf73769110774b2789`. Smoke shard 3 exposed an older test in `messaging.spec.ts:457` that still required three columns of ordinary prose to overflow horizontally ([failure log](https://github.com/block/buzz/actions/runs/33771325404/job/100702242706)). This expectation contradicts the intended wrapping change. Updated its name and assertion to require containment; the separate many-column local-scroll test is unchanged. No production code or harness settings changed in this follow-up. - Affected browser validation: **4/4 passed** (updated existing prose/narrow table case plus the three new channel/thread/overflow cases). - Reused the immutable `4427f2e6` E2E build on a fresh non-reused server; production source is unchanged at the current head. The package/build checks above remain evidence for that unchanged production tree, not a claim of rerunning the full suite at the new SHA. - Targeted Biome check, file-size gate, and `git diff --check` passed. - Current-head CI: https://github.com/block/buzz/actions/runs/33773490446 - Prior unrelated Bestie baseline failure and reproduction: https://github.com/block/buzz/pull/7279#issuecomment-5528077181 - Security authorization and review must target the **current** head, not the old screenshot/build SHA. A Block organization member must comment exactly `@buzz-security-review 925d964b6cf31ba704d74baf73769110774b2789`. --------- Signed-off-by: Logan Johnson <loganj@squareup.com>