🛡️ Sentinel: Fix XSS Vulnerability in VerificationRequest events

[kevinaboos]

🛡️ Sentinel: [HIGH] Fix XSS Vulnerability in VerificationRequest events

🚨 Severity: HIGH
💡 Vulnerability: Unsanitized HTML injection / Cross-Site Scripting (XSS) vulnerability was found in the display of VerificationRequest events. The target user ID (verification.to), which is user-controlled input, was directly interpolated into an HTML format string without escaping.
🎯 Impact: A malicious actor could craft a VerificationRequest with a specially crafted user ID containing HTML/script tags. This would cause the client to render the injected HTML, potentially allowing XSS or other UI-based attacks.
🔧 Fix: Add htmlize::escape_text to the verification.to field before it is used in the format! macros in both src/event_preview.rs and src/home/room_screen.rs.
✅ Verification: Ran cargo check, cargo test --lib, and cargo clippy to ensure the build completes without errors or warnings and that no unrelated tests were broken.

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PR created automatically by Jules for task 8254878586460499012 started by @kevinaboos

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