Fix typecheck errors in AI skills handlers after config split

[bcotrim]

Related issues

• N/A

How AI was used in this PR

AI identified the root cause (config split removed sites from UserData) and applied the fix using SiteServer.getAllDetails().

Proposed Changes

• Replace loadUserData().sites with SiteServer.getAllDetails() in three AI skills IPC handlers (getWordPressSkillsStatusAllSites, installWordPressSkillsToAllSites, removeWordPressSkillFromAllSites) that broke after the decoupled config file strategy was merged.

Testing Instructions

• Run npm run typecheck — should pass with no errors
• Run npm test -- apps/studio/src/tests/ipc-handlers.test.ts — all tests should pass

Pre-merge Checklist

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

[wpmobilebot]

📊 Performance Test Results

Comparing 1a4e892 vs trunk

app-size

Metric	trunk	1a4e892	Diff	Change
App Size (Mac)	1237.57 MB	1237.57 MB	0.00 MB	⚪ 0.0%

site-editor

Metric	trunk	1a4e892	Diff	Change
load	1970 ms	1966 ms	4 ms	⚪ 0.0%

site-startup

Metric	trunk	1a4e892	Diff	Change
siteCreation	6048 ms	7055 ms	+1007 ms	🔴 16.7%
siteStartup	3941 ms	3939 ms	2 ms	⚪ 0.0%

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Results are median values from multiple test runs.

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

[katinthehatsite]

The changes look good, thanks for the fix 👍

[bcotrim]

Fixed with #2871