fix(files): handle ordered-list checkboxes and fix index drift

Author: waleedlatif1

apps/sim/app/workspace/[workspaceId]/files/components/file-viewer/file-viewer.tsx

@@ -716,10 +716,13 @@ function PptxPreview({
 
 function toggleMarkdownCheckbox(markdown: string, targetIndex: number, checked: boolean): string {
   let currentIndex = 0
-  return markdown.replace(/^(\s*[-*+]\s+)\[([ xX])\]/gm, (match, prefix: string) => {
-    if (currentIndex++ !== targetIndex) return match
-    return `${prefix}[${checked ? 'x' : ' '}]`
-  })
+  return markdown.replace(
+    /^(\s*(?:[-*+]|\d+[.)]) +)\[([ xX])\]/gm,
+    (match, prefix: string) => {
+      if (currentIndex++ !== targetIndex) return match
+      return `${prefix}[${checked ? 'x' : ' '}]`
+    }
+  )
 }
 
 const UnsupportedPreview = memo(function UnsupportedPreview({

apps/sim/app/workspace/[workspaceId]/files/components/file-viewer/preview-panel.tsx

@@ -237,6 +237,11 @@ const MarkdownPreview = memo(function MarkdownPreview({
     [onCheckboxToggle]
   )
 
+  const committedCheckboxCount = useMemo(
+    () => (committed ? (committed.match(/^[ \t]*(?:[-*+]|\d+[.)]) +\[[ xX]\]/gm) ?? []).length : 0),
+    [committed]
+  )
+
   checkboxCounterRef.current = 0
 
   const committedMarkdown = useMemo(
@@ -249,6 +254,8 @@ const MarkdownPreview = memo(function MarkdownPreview({
     [committed, components]
   )
 
+  checkboxCounterRef.current = committedCheckboxCount
+
   return (
     <div ref={scrollRef} className='h-full overflow-auto p-6'>
       {committedMarkdown}