🛡️ Sentinel: [MEDIUM] Security Enhancement

[seonghobae]

🚨 Severity: MEDIUM
💡 Vulnerability: Weak randomness in task ID generation and missing Content Security Policy (CSP) header, increasing the risk of predictability and cross-site scripting (XSS) / data exfiltration.
🎯 Impact: Predictable IDs could potentially lead to ID collisions or unexpected behavior. Lack of CSP makes the application more vulnerable to XSS attacks.
🔧 Fix: Upgraded createId to use crypto.randomUUID() when available, with a fallback to the old method. Added a strict Content Security Policy (default-src 'self'; style-src 'self' 'unsafe-inline'; script-src 'self';) to index.html.
✅ Verification: Ran end-to-end Playwright tests (npm run test:e2e) which passed, confirming that the new ID generation works and that the CSP header does not block necessary static assets.

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PR created automatically by Jules for task 17900781706644204868 started by @seonghobae

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