Add toggle to settings modal to un-/install CLI

[fredrikekelund]

Related issues

• Fixes STU-664

Proposed Changes

This PR makes the option to install the Studio CLI more easily available by exposing a toggle in the settings modal:

From a technical perspective, this PR does the following:

• Implements the new UI
• Adds RTK Query hooks for querying whether the CLI is installed
• Adds RTK Query mutations for installing and uninstalling the CLI
• Adds a procedure for uninstalling the CLI on macOS and Windows (we didn't have this previously)
• On Windows, we no longer automatically install the CLI when the app launches

Testing Instructions

TBD

Pre-merge Checklist

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

[github-actions]

📊 Performance Test Results

Comparing f7be9af vs trunk

site-editor

Metric	trunk	f7be9af	Diff	Change
load	9122.00 ms	8038.00 ms	-1084.00 ms	🟢 -11.9%

site-startup

Metric	trunk	f7be9af	Diff	Change
siteCreation	103381.00 ms	101848.00 ms	-1533.00 ms	🟢 -1.5%
siteStartup	31692.00 ms	30643.00 ms	-1049.00 ms	🟢 -3.3%

---

Results are median values from multiple test runs.

Legend: 🟢 Improvement (faster) | 🔴 Regression (slower) | ⚪ No change