fix(hashline-edit): preserve intentional whitespace removal in autocorrect

restoreIndentForPairedReplacement() and restoreLeadingIndent() unconditionally
restored original indentation when replacement had none, preventing intentional
indentation changes (e.g. removing a tab from '\t1절' to '1절'). Skip indent
restoration when trimmed content is identical, indicating a whitespace-only edit.

src/tools/hashline-edit/edit-text-normalization.ts

@@ -53,6 +53,7 @@ export function restoreLeadingIndent(templateLine: string, line: string): string
   const templateIndent = leadingWhitespace(templateLine)
   if (templateIndent.length === 0) return line
   if (leadingWhitespace(line).length > 0) return line
+  if (templateLine.trim() === line.trim()) return line
   return `${templateIndent}${line}`
 }