fix: resolve Prettier markdown code block parsing errors

- Fix syntax errors in skills markdown files (.github/skills, .opencode/skills)
- Change typescript to tsx for code blocks with JSX
- Replace ellipsis (...) in array examples with valid syntax
- Separate CSS from TypeScript into distinct code blocks
- Convert JavaScript object examples to valid JSON in docs
- Fix enum definitions with proper comma separation

.github/skills/web-design-guidelines/SKILL.md

@@ -31,6 +31,7 @@ Use WebFetch to retrieve the latest rules. The fetched content contains all the
 ## Usage
 
 When a user provides a file or pattern argument:
+
 1. Fetch guidelines from the source URL above
 2. Read the specified files
 3. Apply all rules from the fetched guidelines