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-early-exit.md

@@ -13,22 +13,22 @@ Return early when result is determined to skip unnecessary processing.
 
 ```typescript
 function validateUsers(users: User[]) {
-  let hasError = false
-  let errorMessage = ''
-  
+  let hasError = false;
+  let errorMessage = "";
+
   for (const user of users) {
     if (!user.email) {
-      hasError = true
-      errorMessage = 'Email required'
+      hasError = true;
+      errorMessage = "Email required";
     }
     if (!user.name) {
-      hasError = true
-      errorMessage = 'Name required'
+      hasError = true;
+      errorMessage = "Name required";
     }
     // Continues checking all users even after error found
   }
-  
-  return hasError ? { valid: false, error: errorMessage } : { valid: true }
+
+  return hasError ? { valid: false, error: errorMessage } : { valid: true };
 }
 ```
 
@@ -38,13 +38,13 @@ function validateUsers(users: User[]) {
 function validateUsers(users: User[]) {
   for (const user of users) {
     if (!user.email) {
-      return { valid: false, error: 'Email required' }
+      return { valid: false, error: "Email required" };
     }
     if (!user.name) {
-      return { valid: false, error: 'Name required' }
+      return { valid: false, error: "Name required" };
     }
   }
 
-  return { valid: true }
+  return { valid: true };
 }
 ```