🛡️ Sentinel: [HIGH] Harden URL protocol validation in announcement links

[one-more-refactor]

🛡️ Sentinel Security Improvement

Severity: HIGH / Security Enhancement
Vulnerability: Weak URL protocol validation in announcement link configuration. Simple prefix checking can be bypassed using null bytes or ASCII control characters (e.g. java\x00script:, java\tscript:) or protocol-relative URLs (//evil.com).
Impact: XSS via javascript: / data: links or protocol confusion / open redirects on user announcement banners.
Fix:

• Strip ASCII control characters and null bytes ([\x00-\x1F\x7F]) prior to checking and parsing.
• Explicitly disallow protocol-relative URLs (//).
• Validate the link using new URL(sanitized, 'http://localhost') and verify the resulting protocol is strictly http: or https:.
  Verification:
• Ran bun run check (0 errors) and bun run build successfully.
• Verified test cases covering valid http/https URLs, relative path links, protocol-relative links, and obfuscated control character payloads.

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PR created automatically by Jules for task 5931419066498572005 started by @one-more-refactor

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