fix(deps): update astro to resolve 8 Dependabot security alerts

[agent-cairn]

Summary

• Updated astro from ^5.6.1 to 5.18.1 (latest 5.x, minor bump only)
• npm audit fix resolved all 8 transitive dependency vulnerabilities
• Build passes cleanly

Resolved vulnerabilities

• h3 1.15.5 → 1.15.10 (fixes SSE injection + path traversal + double decode bypass)
• devalue 5.6.3 → 5.6.4 (fixes prototype pollution)
• svgo 4.0.0 → 4.0.1 (fixes Billion Laughs DoS)
• rollup 4.58.0 → 4.60.0 (fixes arbitrary file write)

Test plan

• npm run build passes
• npm audit reports 0 vulnerabilities
• All transitive deps at or above patched versions

[gemini-code-assist]

Summary of Changes

Hello, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request focuses on enhancing the project's security posture by updating the core Astro framework and its transitive dependencies. The primary goal was to address multiple reported security vulnerabilities, ensuring the application remains robust and protected against known exploits. The updates were carefully applied, and the system's integrity was verified through successful build processes and security audits.

Highlights

• Astro Dependency Update: Updated the main astro dependency from ^5.6.1 to ^5.18.1.
• Security Vulnerabilities Resolved: Resolved 8 transitive dependency vulnerabilities across h3, devalue, svgo, and rollup by updating their respective versions.
• Build Verification: Confirmed that the build passes cleanly and npm audit reports zero vulnerabilities after the updates.

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[gemini-code-assist]

Code Review

This pull request updates the astro dependency from ^5.6.1 to ^5.18.1. This update also includes various transitive dependency upgrades in package-lock.json, such as @astrojs/internal-helpers, @astrojs/markdown-remark, shiki, smol-toml, rollup, devalue, h3, mdast-util-from-markdown, oniguruma-to-es, sax, and svgo. There is no feedback to provide.

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