[teamleaderleo]

Every feat-cmux-next pull request since #21574 fails web / react-apps-check (2) on two test files it did not touch. #21574 merged with that job red (its local run skipped the browser lane). This puts back the two values that broke them, and keeps the rest of #21574.

• composer-row-rhythm.test.ts failed with uneven gaps inside groups: model→effort 19.0, steer→mic 16.0, mic→send 16.0 at all four widths. --acpmux-row-gap went from 4 px to 7 px, which only the model/effort pair uses; the trailing cluster's gap was pinned to 4 px. Back to 4 px puts model and effort 16 px apart like the trailing controls. The +/chips and mode group gaps are unchanged (the mode padding is group-gap − row-gap, so the drawn group gap stays the same).
• composer-chip-press.test.ts failed with pressed oklab(… / 0.16) against held color(srgb … / 0.11). The open-chip rule fix(cmux-next): align composer control chrome #21574 added after the ink-only hover used --acpmux-row-hover (the 11% pill hover). The rule it overrides used --acpmux-pill-open (16%), the tone the press shows. It now uses --acpmux-pill-open again, and still wins over the transparent hover.

Testing

• The failures above are from the shard 2 logs of fix(cmux-next): align composer control chrome #21574 and of fix(agent-pane): show the whole todo list, as Claude's check/spinner card #21623, fix(cmux-next): stabilize new-tab motion (current base) #21620, fix(gallery): make bare root open a real entry #21618, fix(cmux-next): hide access grant count from pill #21575 and fix(cmux-next): make Apps failures recoverable #21431. All five fail the same two files.
• Locally, the browser lane did not start: the Vite dev server stayed cold (warmDevServer: / still cold after 100000 ms) both before and after this change, so this PR's own react-apps-check (2) run is the evidence.

Changelog

none

🤖 Generated with Claude Code

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Summary by cubic

Fixes the two CSS value regressions from #21574 so web / react-apps-check (2) passes again; every feat-cmux-next PR since that merge has failed two test files it doesn't touch.

• Restores --acpmux-row-gap: 4px so model and effort sit 16 px apart, matching the trailing Interrupt, mic, and Send cluster.
• Selected/open chips now keep their --acpmux-pill-open 16% wash on hover instead of the 11% ink-only hover tone, so a press matches the held chip.

^{Written for commit 5a3ad5c. Summary will update on new commits.}

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[github-actions]

Receipt for 5a3ad5c (this PR's head; a new push replaces it)

• Visual review: HQ feed card · gallery before/after runs
• Checks: this head
• App of this head (app.zip, kept 1 day): gh workflow run reload-build.yml -R manaflow-ai/cmux --ref feat-cmux-next -f tag=pr21645 -f ref=fix/composer-row-rhythm-chip-press -f platform=macos -f backend_mode=local

[teamleaderleo]

Visual preview of 5a3ad5c: in the maintainers' private review feed.

[teamleaderleo]

Bead cx-uotcn created for this PR by the cmux coordinator.