Agentic UI: Add an omnibox to the preview address bar

[bcotrim]

Related issues

• Part of STU-2012

How AI was used in this PR

Ported from the explore-site-centric-conversation-chrome reference branch with Claude Code, trimmed to this PR's scope. Code reviewed and manually QA'd by me.

Proposed Changes

• Clicking the address bar's active segment now opens an omnibox, prefilled with the current path: pick a WordPress destination (Site Editor/Styles/Patterns… for block themes, Customizer/Menus/Widgets for classic — this absorbs the old "Open WordPress" menu destinations), or type a path for literal navigation.

Light	Dark

Testing Instructions

Agentic UI + a running site.

1. Click the active segment → omnibox opens with the current path prefilled and selected.
2. Lists Front end + WordPress destinations (block vs classic theme aware); clicking one navigates (wp-admin ones without a login form).
3. Verify light + dark.

Pre-merge Checklist

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

🤖 Generated with Claude Code

[nightnei]

omnibox opens with the current path prefilled and selected.

I don't see current path as selected, tested different links and selecting a path in the list.

[wpmobilebot]

📊 Performance Test Results

Comparing 1fa3c42 vs trunk

app-size

Metric	trunk	1fa3c42	Diff	Change
App Size (Mac)	1378.88 MB	1378.89 MB	+0.01 MB	⚪ 0.0%

site-editor

Metric	trunk	1fa3c42	Diff	Change
load	1091 ms	783 ms	308 ms	🟢 -28.2%

site-startup

Metric	trunk	1fa3c42	Diff	Change
siteCreation	6518 ms	6505 ms	13 ms	⚪ 0.0%
siteStartup	2382 ms	2365 ms	17 ms	⚪ 0.0%

---

Results are median values from multiple test runs.

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

[bcotrim]

It should be working now @nightnei, nice catch!
Can you take another look, please?

[nightnei]

Looks great 👍