[Fix|Local] Desktop release dry run

[CREDO23]

Summary

• Type the onboarding fetchMock as fetch so the frontend tsc -b build passes
• Drop the Intel Mac build: torch (2.3+) and onnxruntime (1.24+) no longer publish Intel Mac wheels, and macOS 26 is Apple's last Intel release

Test plan

• Frontend tsc -b and vitest pass
• Desktop Release dry run goes green on Apple Silicon, Windows, Linux

High-level PR Summary

This PR fixes the desktop release dry run by addressing two issues: adding proper TypeScript typing to the fetchMock in the onboarding test file so that tsc -b passes, and removing the Intel Mac build configuration from the release workflow since torch 2.3+ and onnxruntime 1.24+ no longer provide Intel Mac wheels and macOS 26 is Apple's last Intel release.

⏱️ Estimated Review Time: 5-15 minutes

💡 Review Order Suggestion

Order	File Path
1	surfsense_local/frontend/src/features/onboarding/onboarding-page.test.tsx
2	.github/workflows/release-local.yml

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Project	Deployment	Actions	Updated
surf-sense-frontend	Ready	Preview	Sep 14, 2026 2:00pm UTC

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