fix: sanitize blog post HTML to prevent stored XSS

[FuturMix]

Fixes #15

Bug

Blog post content in apps/web/app/blog/[slug]/page.tsx is rendered via dangerouslySetInnerHTML without any HTML sanitization. If malicious HTML is injected into a post's content field, it executes in every visitor's browser (stored XSS).

Fix

• Added sanitize-html dependency
• Sanitize post.content before rendering, stripping dangerous tags (script, iframe, event handlers) while preserving safe formatting tags (h1-h3, img, p, ul, ol, a, code, pre, blockquote, etc.)

After merging

Run npm install (or your package manager) in apps/web/ to install the sanitize-html dependency.

[socket-security]

Review the following changes in direct dependencies. Learn more about Socket for GitHub.

Diff	Package	Supply Chain Security	Vulnerability	Quality	Maintenance	License
	sanitize-html@​2.17.5

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[socket-security]

Warning

Review the following alerts detected in dependencies.

According to your organization's Security Policy, it is recommended to resolve "Warn" alerts. Learn more about Socket for GitHub.

Action	Severity	Alert  (click "▶" to expand/collapse)
Warn		Obfuscated code: npm entities is 91.0% likely obfuscated Confidence: 0.91 Location: Package overview From: ? → npm/sanitize-html@2.17.5 → npm/entities@4.5.0 ℹ Read more on: This package | This alert | What is obfuscated code? Next steps: Take a moment to review the security alert above. Review the linked package source code to understand the potential risk. Ensure the package is not malicious before proceeding. If you're unsure how to proceed, reach out to your security team or ask the Socket team for help at support@socket.dev. Suggestion: Packages should not obfuscate their code. Consider not using packages with obfuscated code. Mark the package as acceptable risk. To ignore this alert only in this pull request, reply with the comment @SocketSecurity ignore npm/entities@4.5.0. You can also ignore all packages with @SocketSecurity ignore-all. To ignore an alert for all future pull requests, use Socket's Dashboard to change the triage state of this alert.
Warn		Obfuscated code: npm htmlparser2 is 90.0% likely obfuscated Confidence: 0.90 Location: Package overview From: ? → npm/sanitize-html@2.17.5 → npm/htmlparser2@10.1.0 ℹ Read more on: This package | This alert | What is obfuscated code? Next steps: Take a moment to review the security alert above. Review the linked package source code to understand the potential risk. Ensure the package is not malicious before proceeding. If you're unsure how to proceed, reach out to your security team or ask the Socket team for help at support@socket.dev. Suggestion: Packages should not obfuscate their code. Consider not using packages with obfuscated code. Mark the package as acceptable risk. To ignore this alert only in this pull request, reply with the comment @SocketSecurity ignore npm/htmlparser2@10.1.0. You can also ignore all packages with @SocketSecurity ignore-all. To ignore an alert for all future pull requests, use Socket's Dashboard to change the triage state of this alert.

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[FuturMix]

Hi @ralyodio — we have 2 fix PRs for c0upons (#16 stored XSS fix, #18 auth for coupon/store creation). Would appreciate a review. Thanks!