Fix Dark theme for Studio Code

[nightnei]

Related issues

• Fixes STU-1809

How AI was used in this PR

AI adjusted color and background properties. I tested by applying changes file by file, everything looks good.

Proposed Changes

Dark theme for Studio Code is broken. With this PR we are fixing it to align with Studio styles.

BEFORE	AFTER

Testing Instructions

1. npm start
2. Open Studio Code tab
3. Assert that for Light theme no regressions
4. Set Dark theme
5. Assert that everything looks good

[wpmobilebot]

📊 Performance Test Results

Comparing 0c3523a vs trunk

app-size

Metric	trunk	0c3523a	Diff	Change
App Size (Mac)	1384.39 MB	1384.39 MB	0.01 MB	⚪ 0.0%

site-editor

Metric	trunk	0c3523a	Diff	Change
load	1675 ms	1650 ms	25 ms	⚪ 0.0%

site-startup

Metric	trunk	0c3523a	Diff	Change
siteCreation	9037 ms	9078 ms	+41 ms	⚪ 0.0%
siteStartup	4412 ms	4395 ms	17 ms	⚪ 0.0%

---

Results are median values from multiple test runs.

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

[sejas]

I tested with different prompts, outputs and also logged out. The dark mode works as expected. Thanks for catching the issue and fixing it.