[christophersesugh]

Motivation

Release QA in #31 reproduced a WebKit-only compact toolbar failure: at a 1600×900 viewport the bottom toolbar measured 56px against the existing <55px acceptance assertion. The independent QA geometry test found no overlapping or escaping controls; the height discrepancy should not be treated as proven clipping.

Implementation

• Reduce the outer vertical padding of the shared toolbar from 6px to 4px on each side. The existing native select dimensions, font metrics, hit targets and semantic controls are unchanged; reducing the bar's spacing makes room for WebKit's taller native select without forcing its height down or disabling the check.
• Extend the existing compact toolbar regression to verify that every interactive control remains fully within the toolbar's vertical bounds, with a 1px rounding tolerance. Replace the Chromium-specific 34px exact native chapter-select height assumption with an observed 34–42px native-control range; keep the strict <55px toolbar-height assertion unchanged.
• Run the same complete browser suite in Firefox and WebKit via a read-only QA workflow, in addition to regular Chromium CI. This workflow and browser-selector config intentionally match test(qa): verify post-v0.0.2 release candidate across browsers and record gates #31; if this fix merges first, Git should recognize those identical changes when test(qa): verify post-v0.0.2 release candidate across browsers and record gates #31 is later refreshed.
• Record the change in the unreleased changelog.

Verification

Verified on fix head 4392eaa806a4b031013c667adaf71fb7630917ed:

• Standard Throughline CI #43217293735: PASS — 235/235 unit tests (33 files), 82/82 Chromium tests (14 files), typecheck, source/license audits, preview build, package build, packed Vite/browser, framework, and Markdown consumer audits.
• Cross-browser QA #43217293007: PASS — 82/82 Firefox and 82/82 WebKit browser tests. The original strict compact-height assertion, new vertical control bounds, and remaining toolbar tests all pass.
• Earlier WebKit diagnostic #43216902930 failed only at the chapter-select exact-height assumption: WebKit's native select is 42px rather than Chromium/Firefox's 34px. The compact-height and added containment checks had already passed. The test now accepts only the measured native-size range while retaining the intended layout invariants.
• No separate local dependency install, manually inspected screenshot, human device/assistive-technology test, real-world performance baseline or live documentation application integration is claimed.

Risk and compatibility

• Visual vertical spacing decreases by 4px in all layouts; no compiler, trace, package export, playback semantics, native control height or CSS custom property is changed.
• Compactness and bounds are covered by browser tests, but human review at high text zoom and real Safari/device testing is still needed.

Relationship to #31 and release gates

This is a separate implementation PR because #31 is intentionally verification-only. It only addresses QA-04; QA-01/02/03/05/06/07 (human comprehension, physical-device audio/accessibility, live docs app integration, calibrated performance, design acceptance and publication/source-rights review) remain unverified or maintainer-controlled, not software defects claimed fixed here.

No signing, approval, merge, package publication or release is requested.

[christophersesugh]

QA re-review — COMMENT only, not approval.

Scope: PR #32 head 4392eaa806a4b031013c667adaf71fb7630917ed, relative to main 26d4e81756e28a6c28ac9f0c4b3dbc2e86b6f8c9. Inspected the full changed-file patch (CSS, toolbar browser test, browser matrix/config, changelog) and the actual GitHub Actions job logs.

Original issue: WebKit measured a 56px toolbar against the original strict <55px check. The candidate decreases outer toolbar block padding 6px -> 4px each side, retains native control height, retains <55px, adds per-control vertical containment, and permits the independently observed native chapter-select 34–42px range. The intermediate run exposed the formerly Chromium-specific 42px vs 34px assertion; the final revision addresses that assumption without dropping compactness or containment checks. The change is additive to testing and limited in CSS scope; no public API, compiler or trace contract change.

Checks verified on exact fix head: Standard CI #43217293735 PASS: 235 unit (33 files), 82 Chromium UI (14 files), preview/typecheck, package/build, licenses, packed consumers and framework/Markdown hosts. Cross-browser QA #43217293007 PASS: Firefox 82/82, WebKit 82/82. No failure found by these checks in the scoped WebKit fix.

Residual limits: These are headless Linux browser regressions, not a visual sign-off in Safari/macOS/iOS, high text zoom, screen readers, actual audio hardware or physical touch devices. Check those before making broader accessibility/release claims.

Relationship to #31: #31 still has head fa38735a, including the old red WebKit evidence and an additional geometry regression that #32 does not contain. If #32 is merged after maintainer review, rebase/update #31, reconcile duplicated browser-config/workflow changes, rerun the combined 83-test browser suite in Chromium, Firefox and WebKit, and revise the report from FAIL only if those exact CI results justify it. Separately outstanding V-10, docs app, controlled performance, governance/rights and release process gates remain open.

Review outcome: Focused fix is supported by passing automated evidence; no release clearance or merge approval is expressed.