Update README_react.html to use algorithmic condition for fading and re-generate index

- Fixed hardcoded array condition ![-1, 0, 2, 1, 2].includes(v) to use !isTruthy in JavaScript/2634. Filter Elements from Array/Claude Code Sonnet 4.6 extended/README_react.html
- Re-generated public/index.html and updated public content using python generate_index.py command on local dev to ensure public directory reflects changes. Changed lines in public/index.html (419, 434, 439, 581, 763, 806) are auto-generated.

Author: myoshi2891

JavaScript/2634. Filter Elements from Array/Claude Code Sonnet 4.6 extended/README_react.html

@@ -1282,7 +1282,7 @@ <h4 class="outfit font-bold text-amber-800 mb-3 text-base">
                                     if (isCurrent && data.highlight === 'falsy')
                                         bg =
                                             'bg-red-200 border-red-500 text-red-900 scale-110 shadow-lg';
-                                    if (data.highlight === 'done' && ![-1, 0, 2, 1, 2].includes(v))
+                                    if (data.highlight === 'done' && !isTruthy)
                                         bg =
                                             'bg-slate-100 border-slate-300 text-slate-400 opacity-50';
 

public/JavaScript/2634. Filter Elements from Array/Claude Code Sonnet 4.6 extended/README_react.html

@@ -1282,7 +1282,7 @@ <h4 class="outfit font-bold text-amber-800 mb-3 text-base">
                                     if (isCurrent && data.highlight === 'falsy')
                                         bg =
                                             'bg-red-200 border-red-500 text-red-900 scale-110 shadow-lg';
-                                    if (data.highlight === 'done' && ![-1, 0, 2, 1, 2].includes(v))
+                                    if (data.highlight === 'done' && !isTruthy)
                                         bg =
                                             'bg-slate-100 border-slate-300 text-slate-400 opacity-50';