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

.opencode/skills/vercel-react-best-practices/rules/js-set-map-lookups.md

@@ -12,13 +12,13 @@ Convert arrays to Set/Map for repeated membership checks.
 **Incorrect (O(n) per check):**
 
 ```typescript
-const allowedIds = ['a', 'b', 'c', ...]
-items.filter(item => allowedIds.includes(item.id))
+const allowedIds = ["a", "b", "c"];
+items.filter((item) => allowedIds.includes(item.id));
 ```
 
 **Correct (O(1) per check):**
 
 ```typescript
-const allowedIds = new Set(['a', 'b', 'c', ...])
-items.filter(item => allowedIds.has(item.id))
+const allowedIds = new Set(["a", "b", "c"]);
+items.filter((item) => allowedIds.has(item.id));
 ```