Agentic UI: Fix agentic UI dark-mode icons and dropdowns

[gavande1]

Related issues

• Related to STU-2032

How AI was used in this PR

AI helped locate the icon and dropdown code in the agentic UI, diagnose why each element did not follow dark mode, and draft the fixes. I reviewed the code and checked the behavior in the running Linux app.

Proposed Changes

Several elements in the agentic UI did not adapt to the color scheme:

• The account avatar fallback was invisible in both themes: a light icon in light mode and a black icon in dark mode.
• Native select dropdowns (for example the language and preferred-terminal fields) showed a white option list with unreadable text in dark mode.
• The envelope icon on the Admin email field rendered near-black in dark mode.

Now all three follow the active theme, so they stay legible in both light and dark mode.

Testing Instructions

1. In the agentic UI, switch to dark mode.
2. Open the account menu and confirm the avatar fallback icon is visible.
3. Open Settings, open the language and preferred-terminal dropdowns, and confirm the option list is dark with readable text.
4. Open a site's settings and confirm the Admin email envelope icon is visible.
5. Repeat in light mode to confirm nothing regressed.

Pre-merge Checklist

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

[wpmobilebot]

📊 Performance Test Results

Comparing bfaee23 vs trunk

app-size

Metric	trunk	bfaee23	Diff	Change
App Size (Mac)	1419.48 MB	1419.48 MB	+0.00 MB	⚪ 0.0%

site-editor

Metric	trunk	bfaee23	Diff	Change
load	748 ms	742 ms	6 ms	⚪ 0.0%

site-startup

Metric	trunk	bfaee23	Diff	Change
siteCreation	6497 ms	6473 ms	24 ms	⚪ 0.0%
siteStartup	2393 ms	2395 ms	+2 ms	⚪ 0.0%

---

Results are median values from multiple test runs.

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

[gcsecsey]

Thanks for the fix @gavande1! Changes LGTM and I confirm seeing the dark-version icons now. 👍

For the dropdowns in Settings, I tried to reproduce getting light-themed selects there, but it was working correctly for me with the trunk version as well.

Area	Before	After
Default avatar
Site settings
Settings dropdowns