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-cache-property-access.md

@@ -13,16 +13,16 @@ Cache object property lookups in hot paths.
 
 ```typescript
 for (let i = 0; i < arr.length; i++) {
-  process(obj.config.settings.value)
+  process(obj.config.settings.value);
 }
 ```
 
 **Correct (1 lookup total):**
 
 ```typescript
-const value = obj.config.settings.value
-const len = arr.length
+const value = obj.config.settings.value;
+const len = arr.length;
 for (let i = 0; i < len; i++) {
-  process(value)
+  process(value);
 }
 ```