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-batch-dom-css.md

@@ -10,55 +10,60 @@ tags: javascript, dom, css, performance, reflow, layout-thrashing
 Avoid interleaving style writes with layout reads. When you read a layout property (like `offsetWidth`, `getBoundingClientRect()`, or `getComputedStyle()`) between style changes, the browser is forced to trigger a synchronous reflow.
 
 **This is OK (browser batches style changes):**
+
 ```typescript
 function updateElementStyles(element: HTMLElement) {
   // Each line invalidates style, but browser batches the recalculation
-  element.style.width = '100px'
-  element.style.height = '200px'
-  element.style.backgroundColor = 'blue'
-  element.style.border = '1px solid black'
+  element.style.width = '100px';
+  element.style.height = '200px';
+  element.style.backgroundColor = 'blue';
+  element.style.border = '1px solid black';
 }
 ```
 
 **Incorrect (interleaved reads and writes force reflows):**
+
 ```typescript
 function layoutThrashing(element: HTMLElement) {
-  element.style.width = '100px'
-  const width = element.offsetWidth  // Forces reflow
-  element.style.height = '200px'
-  const height = element.offsetHeight  // Forces another reflow
+  element.style.width = '100px';
+  const width = element.offsetWidth; // Forces reflow
+  element.style.height = '200px';
+  const height = element.offsetHeight; // Forces another reflow
 }
 ```
 
 **Correct (batch writes, then read once):**
+
 ```typescript
 function updateElementStyles(element: HTMLElement) {
   // Batch all writes together
-  element.style.width = '100px'
-  element.style.height = '200px'
-  element.style.backgroundColor = 'blue'
-  element.style.border = '1px solid black'
-  
+  element.style.width = '100px';
+  element.style.height = '200px';
+  element.style.backgroundColor = 'blue';
+  element.style.border = '1px solid black';
+
   // Read after all writes are done (single reflow)
-  const { width, height } = element.getBoundingClientRect()
+  const { width, height } = element.getBoundingClientRect();
 }
 ```
 
 **Correct (batch reads, then writes):**
+
 ```typescript
 function avoidThrashing(element: HTMLElement) {
   // Read phase - all layout queries first
-  const rect1 = element.getBoundingClientRect()
-  const offsetWidth = element.offsetWidth
-  const offsetHeight = element.offsetHeight
-  
+  const rect1 = element.getBoundingClientRect();
+  const offsetWidth = element.offsetWidth;
+  const offsetHeight = element.offsetHeight;
+
   // Write phase - all style changes after
-  element.style.width = '100px'
-  element.style.height = '200px'
+  element.style.width = '100px';
+  element.style.height = '200px';
 }
 ```
 
 **Better: use CSS classes**
+
 ```css
 .highlighted-box {
   width: 100px;
@@ -67,38 +72,36 @@ function avoidThrashing(element: HTMLElement) {
   border: 1px solid black;
 }
 ```
+
 ```typescript
 function updateElementStyles(element: HTMLElement) {
-  element.classList.add('highlighted-box')
-  
-  const { width, height } = element.getBoundingClientRect()
+  element.classList.add('highlighted-box');
+
+  const { width, height } = element.getBoundingClientRect();
 }
 ```
 
 **React example:**
+
 ```tsx
 // Incorrect: interleaving style changes with layout queries
 function Box({ isHighlighted }: { isHighlighted: boolean }) {
-  const ref = useRef<HTMLDivElement>(null)
-  
+  const ref = useRef<HTMLDivElement>(null);
+
   useEffect(() => {
     if (ref.current && isHighlighted) {
-      ref.current.style.width = '100px'
-      const width = ref.current.offsetWidth // Forces layout
-      ref.current.style.height = '200px'
+      ref.current.style.width = '100px';
+      const width = ref.current.offsetWidth; // Forces layout
+      ref.current.style.height = '200px';
     }
-  }, [isHighlighted])
-  
-  return <div ref={ref}>Content</div>
+  }, [isHighlighted]);
+
+  return <div ref={ref}>Content</div>;
 }
 
 // Correct: toggle class
 function Box({ isHighlighted }: { isHighlighted: boolean }) {
-  return (
-    <div className={isHighlighted ? 'highlighted-box' : ''}>
-      Content
-    </div>
-  )
+  return <div className={isHighlighted ? 'highlighted-box' : ''}>Content</div>;
 }
 ```