fix(web): keep the zoomed sidebar trigger clear of the macOS window buttons

[Mnigos]

Zooming the desktop app with Cmd+= past the md breakpoint turns the left sidebar into a sheet. The sheet header's toggle only had the header's own px-3 padding, so on macOS it sat on top of the native close and minimize buttons, while the floating toggle shown when the sheet is closed already honors --workspace-controls-left.

Two small changes:

• SidebarChrome: the sheet trigger gets the same left edge as the floating control on desktop, ml-[calc(var(--workspace-controls-left)-0.75rem)] when isElectron. The token is the 90 native points reserved for the traffic lights on macOS, and 0.75rem elsewhere and in fullscreen, so the calc is zero there. Web and mobile keep the header padding. The class comes from a small helper with a unit test.
• AppSidebarLayout: the macOS override of --workspace-controls-left moves from the provider's inline style to the document root. The sheet renders through a portal outside the provider subtree, so with the inline style the portaled header only ever saw the root default and the margin above computed to zero. A layout effect sets and clears the root property with the same fullscreen condition as before, so the floating control is unchanged and the first paint already has the value.

Fixes #12036

before (zoomed, sheet open)	after

Tests: SidebarChrome.test.ts (2 cases), targeted lint, web typecheck. Visual check on the desktop dev app: Cmd+= four times from a 1100px window until the sidebar becomes a sheet, open it, the toggle sits to the right of the green button like the closed-state control; Cmd+0 restores the desktop sidebar.

Implemented with Claude Code (Claude Fable 5.1).

[macroscopeapp]

Approvability

Verdict: Approved at a61ed40

Macroscope's review found this PR approvable — This is a narrowly scoped sidebar UI bug fix that preserves existing web, mobile, fullscreen, and non-macOS behavior while making the existing window-control inset available to the portaled sheet. The production changes are small and covered by focused tests, with no schema, infrastructure, security, billing, or static-analysis impact.

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[macroscopeapp]

All clear

^{Posted via Macroscope — UI Consistency}

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Reviewing files that changed from the base of the PR and between a61ed40 and 057bf92.

📒 Files selected for processing (2)

• apps/web/src/components/AppSidebarLayout.tsx
• apps/web/src/components/sidebar/SidebarChrome.tsx

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📝 Walkthrough

Walkthrough

For non-fullscreen macOS desktop windows, the layout sets the workspace-control offset on the document root. The sidebar trigger applies an Electron-specific inset. Tests cover the Electron and non-Electron class results.

Changes

macOS sidebar positioning

Layer / File(s)	Summary
Workspace control offset lifecycle apps/web/src/components/AppSidebarLayout.tsx	AppSidebarLayout sets --workspace-controls-left on the document root for non-fullscreen macOS windows. The effect removes the property when its condition no longer applies.
Sidebar trigger inset apps/web/src/components/sidebar/SidebarChrome.tsx, apps/web/src/components/sidebar/SidebarChrome.test.ts	resolveSidebarSheetTriggerInsetClass returns an Electron margin class or null. SidebarTrigger applies the resolved class, and tests cover both results.

Priority: ⬇️ Low

Estimated code review effort: 2 (Simple) | ~10 minutes

Change: Bug fix · Severity of issue fixed: Low

Suggested reviewers: juliusmarminge

Merge Risk: 🔵 Low · up to 057bf

The change addresses the reported zoomed-sidebar overlap. A separate fullscreen offset may affect the trigger’s visual position, but available evidence does not establish that it occurs; the remaining risk is limited.

Security Architecture Review

Security architecture risk: ⚪ Minimal · up to 057bf

The change adjusts sidebar positioning without introducing a new privileged action or weakening an access control. The document-level override has bounded ownership and cleanup.

Retained concerns
No architecture-level concerns identified.

Security review details

Security Blast Radius

• inferred — The expanded inheritance scope is the current renderer document. Identified consumers terminate in sidebar and titlebar positioning; no tenant, service, credential, data-store, or privileged-operation exposure was identified in this flow.

Trust Boundaries and Controls

• inferred — The changed flow writes an existing inset token and selects a constant CSS class; it does not interpolate route or user content into an executable sink. Platform and fullscreen conditions constrain presentation, not authorization. The inspected comparison does not change the desktop bridge API, route access gate, or sidebar action authority.

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 50.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 2 functions across 3 files.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly identifies the web fix and its purpose: keeping the zoomed sidebar trigger clear of macOS window buttons.
Description check	✅ Passed	The description explains the problem, the changes, the linked issue, and the reported tests and visual check. It includes before-and-after screenshots and identifies the implementation agent. It does …
Linked Issues check	✅ Passed	Issue [#12036] requires the sidebar toggle to stay separate from macOS window controls after zooming. AppSidebarLayout sets --workspace-controls-left on the document root for non-fullscreen macOS …
Out of Scope Changes check	✅ Passed	The changes to the root inset, sheet-trigger placement, and its unit tests all support issue [#12036]. The reviewed changes show no unrelated behavior or scope.

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Actionable comments posted: 1

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Inline comments:
In `@apps/web/src/components/AppSidebarLayout.tsx`:
- Around line 185-193: Update the useLayoutEffect controlling
--workspace-controls-left in AppSidebarLayout so macOS fullscreen explicitly
sets the documented 0.75rem inset, preventing the active .wco synchronizer from
supplying env(titlebar-area-x); retain the existing non-fullscreen reservation
and cleanup behavior.

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Configuration used: Path: .coderabbit.yaml

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📥 Commits

Reviewing files that changed from the base of the PR and between ccf220b and f7e3461bb5043539e08f89faad76dd7e1891171c.

📒 Files selected for processing (3)

• apps/web/src/components/AppSidebarLayout.tsx
• apps/web/src/components/sidebar/SidebarChrome.test.ts
• apps/web/src/components/sidebar/SidebarChrome.tsx

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Dismissing prior approval to re-evaluate a61ed40