deps: upgrade all dependencies to latest

[jongio]

Automated dependency upgrade.

• Direct devDependencies already at latest (within npm min-release-age cooldown); verified via npm-check-updates.
• Ran pnpm update --latest to refresh transitive dependencies and lockfile.
• Notable transitive bumps: sharp 0.35.2 → 0.35.3, rolldown 1.1.3 → 1.1.4, package-manager-detector 1.6.0 → 1.7.0; overridden supply-chain deps freshened (postcss 8.5.16, yaml 2.9.0, smol-toml 1.7.0, fast-uri 3.1.3, js-yaml 4.3.0).
• Full lifecycle green locally: lint, astro check (0 errors), typecheck, 16/16 tests.

Co-authored-by: Copilot App [email protected]