Show the sidebar Studio wordmark only in the browser UI

[shaunandrews]

Related issues

• Related to Add the studio ui local web surface #3953

How AI was used in this PR

Written with Claude Code, directed and reviewed by @shaunandrews.

Proposed Changes

#3953 added a "Studio" wordmark to the agentic UI's sidebar header on every surface. In the browser (studio ui / hosted) it earns its place — a tab has no window chrome naming the app, and the header would otherwise be an empty drag-strip. In the desktop app it's redundant (the dock icon and window already establish the app) and crowds the header as the sidebar narrows.

This scopes the wordmark to where it helps: it now shows only when the UI is not running in a dedicated app window. The signal is a new appWindow entry in the connector capabilities layer #3953 introduced for exactly this kind of host difference — true for the Electron connector, false for the local and hosted ones — so the distinction stays declarative and mockable rather than sniffed from the environment.

User impact: the desktop sidebar header returns to just the create menu and sidebar toggle; the browser surface keeps its wordmark unchanged.

Testing Instructions

• Desktop: run the app with the agentic UI enabled (ENABLE_AGENTIC_UI=true npm start) — the sidebar header shows no "Studio" label, just the create menu and toggle, centered with the traffic lights.
• Browser: npm run cli:build && node apps/cli/dist/cli/main.mjs ui — the header still shows the "Studio" wordmark, aligned with the site list below.
• Check both light and dark color schemes.

Pre-merge Checklist

• Have you checked for TypeScript, React or other console errors? — npm run typecheck --workspace=apps/ui, eslint, and the site-preview/sidebar-layout tests are clean.

🤖 Generated with Claude Code

[wpmobilebot]

📊 Performance Test Results

Comparing 54b7291 vs trunk

app-size

Metric	trunk	54b7291	Diff	Change
App Size (Mac)	1411.75 MB	1411.75 MB	+0.00 MB	⚪ 0.0%

site-editor

Metric	trunk	54b7291	Diff	Change
load	1112 ms	1057 ms	55 ms	🟢 -4.9%

site-startup

Metric	trunk	54b7291	Diff	Change
siteCreation	6488 ms	6494 ms	+6 ms	⚪ 0.0%
siteStartup	2386 ms	2391 ms	+5 ms	⚪ 0.0%

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Results are median values from multiple test runs.

Legend: 🟢 Improvement (faster) | 🔴 Regression (slower) | ⚪ No change (<50ms diff)

[youknowriad]

I wouldn't mind if this is removed in studio ui as well. That was not an intentional addition, I think a wrong conflict handling.