format: apply repo prettier (3.8.1) to the folded skills tree

963 markdown files reformatted with the repository's pinned prettier so
pnpm format:check covers the folded tree like every other repo file.

The formatter's embedded-language pass also normalized code fences
(TS semicolons, closed HTML tags in examples, lowercased CSS hex colors,
one renumbered list that skipped an index). Alphanumeric token deltas vs
the fold commit were audited file-by-file; all are formatter-equivalent
markup normalizations plus the four sanitized skills.

packages/mosaic/framework/skills/vercel-react-best-practices/rules/js-cache-storage.md

@@ -13,7 +13,7 @@ tags: javascript, localStorage, storage, caching, performance
 
 ```typescript
 function getTheme() {
-  return localStorage.getItem('theme') ?? 'light'
+  return localStorage.getItem('theme') ?? 'light';
 }
 // Called 10 times = 10 storage reads
 ```
@@ -21,18 +21,18 @@ function getTheme() {
 **Correct (Map cache):**
 
 ```typescript
-const storageCache = new Map<string, string | null>()
+const storageCache = new Map<string, string | null>();
 
 function getLocalStorage(key: string) {
   if (!storageCache.has(key)) {
-    storageCache.set(key, localStorage.getItem(key))
+    storageCache.set(key, localStorage.getItem(key));
   }
-  return storageCache.get(key)
+  return storageCache.get(key);
 }
 
 function setLocalStorage(key: string, value: string) {
-  localStorage.setItem(key, value)
-  storageCache.set(key, value)  // keep cache in sync
+  localStorage.setItem(key, value);
+  storageCache.set(key, value); // keep cache in sync
 }
 ```
 
@@ -41,15 +41,13 @@ Use a Map (not a hook) so it works everywhere: utilities, event handlers, not ju
 **Cookie caching:**
 
 ```typescript
-let cookieCache: Record<string, string> | null = null
+let cookieCache: Record<string, string> | null = null;
 
 function getCookie(name: string) {
   if (!cookieCache) {
-    cookieCache = Object.fromEntries(
-      document.cookie.split('; ').map(c => c.split('='))
-    )
+    cookieCache = Object.fromEntries(document.cookie.split('; ').map((c) => c.split('=')));
   }
-  return cookieCache[name]
+  return cookieCache[name];
 }
 ```
 
@@ -59,12 +57,12 @@ If storage can change externally (another tab, server-set cookies), invalidate c
 
 ```typescript
 window.addEventListener('storage', (e) => {
-  if (e.key) storageCache.delete(e.key)
-})
+  if (e.key) storageCache.delete(e.key);
+});
 
 document.addEventListener('visibilitychange', () => {
   if (document.visibilityState === 'visible') {
-    storageCache.clear()
+    storageCache.clear();
   }
-})
+});
 ```