chore(deps): batch update direct dependencies
- @modelcontextprotocol/sdk 1.25.2 → 1.26.0
- @aws-sdk/credential-providers 3.925.0 → 3.985.0
- js-yaml 4.1.0 → 4.1.1
- @sveltejs/kit 2.21.2 → 2.50.2
Fix type errors from SvelteKit 2.50 (page.params now string | undefined)
by extracting derived variables with ?? "" fallbacks.