Agentic UI: Realign sidebar add/toggle buttons with the site status dots

[shaunandrews]

Related issues

• Follow-up to build(deps): bump the wordpress group with 30 updates #4320

How AI was used in this PR

Claude traced the regression through git history and wrote the fix. Reviewed by the author.

Proposed Changes

• In the agentic sidebar, the "Add site" button (top) and the sidebar toggle (bottom) sat 4px to the right of the site rows' status dots.
• build(deps): bump the wordpress group with 30 updates #4320 upgraded @wordpress/theme to 1.0, which dropped the compact density the app used. The header and footer trailing insets were expressed as 2xl − xs, the site rows' as lg; those were equal (12px) under compact and only coincidentally so. On the default scale they diverge (12px vs 16px).
• The header and footer insets are now derived from the same lg column the rows end on, so all three line up again in both densities and in light/dark.

Screenshots

Red line runs through the center of the + button. Dark chrome, studio ui in the browser.

Before (trunk)	After

Testing Instructions

• npm run cli:build:ui && node apps/cli/dist/cli/main.mjs ui --no-open, open http://localhost:8081.
• With several running sites, check that the + button, each row's green status dot (or Xdebug bug icon), and the sidebar toggle in the footer share one vertical center line.
• Repeat with the sidebar in light and dark theme, and on a non-macOS/browser window (flush header variant).

Pre-merge Checklist

• Have you checked for TypeScript, React or other console errors?

[wpmobilebot]

📊 Performance Test Results

Comparing 9c40353 vs trunk

app-size

Metric	trunk	9c40353	Diff	Change
App Size (Mac)	1435.25 MB	1435.25 MB	+0.00 MB	⚪ 0.0%

site-editor

Metric	trunk	9c40353	Diff	Change
load	1169 ms	1185 ms	+16 ms	⚪ 0.0%

site-startup

Metric	trunk	9c40353	Diff	Change
siteCreation	7516 ms	7521 ms	+5 ms	⚪ 0.0%
siteStartup	3399 ms	3377 ms	22 ms	⚪ 0.0%

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Results are median values from multiple test runs.

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