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/autocorrect-replacement-lines.ts

@@ -159,6 +159,7 @@ export function restoreIndentForPairedReplacement(
     if (leadingWhitespace(line).length > 0) return line
     const indent = leadingWhitespace(originalLines[idx])
     if (indent.length === 0) return line
+    if (originalLines[idx].trim() === line.trim()) return line
     return `${indent}${line}`
   })
 }