🛡️ Sentinel: [MEDIUM] Fix missing timeout configurations on fetch calls

[schmug]

🛡️ Sentinel: [MEDIUM] Fix missing timeout configurations on fetch calls

🚨 Severity: MEDIUM
💡 Vulnerability: Multiple fetch calls across the codebase lacked timeout configurations.
🎯 Impact: Without timeouts, these requests could hang indefinitely if the server is unresponsive or slow, leading to application hangs and potential Denial of Service (DoS) vulnerabilities on both client and build-time prerendering.
🔧 Fix: Added signal: AbortSignal.timeout(10000) to the vulnerable fetch calls in src/lib/github.ts, src/components/os/apps/BlogApp.tsx, and src/hooks/useProjects.ts.
✅ Verification: pnpm build and pnpm test successfully completed without hanging.

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PR created automatically by Jules for task 8092069003503176568 started by @schmug

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