Agentic UI: Remove horizontal scroll in Settings

[nightnei]

How AI was used in this PR

AI investigated, and I tested. Looks rational.

Proposed Changes

Let's remove redundant scroll:

Testing Instructions

1. Electron -> feature flags -> Enable Agentic UI
2. Click on your name in the bottom-left corner -> Settings
3. Assert that you don't see horizontal scroll anymore

[wpmobilebot]

📊 Performance Test Results

Comparing 7e23bf6 vs trunk

app-size

Metric	trunk	7e23bf6	Diff	Change
App Size (Mac)	1361.84 MB	1355.70 MB	6.14 MB	🟢 -0.5%

site-editor

Metric	trunk	7e23bf6	Diff	Change
load	1091 ms	1077 ms	14 ms	⚪ 0.0%

site-startup

Metric	trunk	7e23bf6	Diff	Change
siteCreation	7024 ms	7003 ms	21 ms	⚪ 0.0%
siteStartup	2352 ms	2369 ms	+17 ms	⚪ 0.0%

---

Results are median values from multiple test runs.

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

[bcotrim]

Thanks for catching and fixing this issue
LGTM 👍