Simplify and align the analytics toggle in legacy settings

[wojtekn]

Related issues

• Follow up to Add Tracks analytics (Phase 1) alongside MC Stats #4162

How AI was used in this PR

Claude Code applied a designer's feedback: removed the redundant description line and computed the left padding needed to align the checkbox with the CLI toggle (based on the rendered @wordpress/components control dimensions).

Proposed Changes

The analytics opt-out checkbox in the legacy (apps/studio) Settings screen previously rendered a second line of descriptive text and sat with its own indentation.

Per design feedback:

• Removed the secondary description line, so the setting is now a single, cleaner label — consistent with how this screen is being wound down.
• Added left padding so the checkbox's right edge lines up with the right edge of the "Studio CLI for terminal" switch above it, and both settings' labels line up on the left. This makes the two adjacent controls read as a coherent group.

Testing Instructions

1. Open Settings (General tab) in Studio.
2. Confirm the "Help improve Studio by sharing anonymous usage statistics" checkbox no longer shows a second line of description text.
3. Confirm the checkbox's right edge aligns with the right edge of the "Studio CLI for terminal" switch, and both labels start at the same left position.
4. Verify in both light and dark color schemes.

Pre-merge Checklist

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

[wpmobilebot]

📊 Performance Test Results

Comparing 8c72196 vs trunk

app-size

Metric	trunk	8c72196	Diff	Change
App Size (Mac)	1375.46 MB	1375.46 MB	0.00 MB	⚪ 0.0%

site-editor

Metric	trunk	8c72196	Diff	Change
load	1067 ms	1030 ms	37 ms	⚪ 0.0%

site-startup

Metric	trunk	8c72196	Diff	Change
siteCreation	6990 ms	7019 ms	+29 ms	⚪ 0.0%
siteStartup	2356 ms	2376 ms	+20 ms	⚪ 0.0%

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Results are median values from multiple test runs.

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

[shaunandrews]

The alignment looks better. Thanks!