fix: field rename skips saves for unmodified files

tools/fieldRename.ts

@@ -153,6 +153,7 @@ class RenameFields implements ITool {
       const fields = form.getFields();
 
       const foundUpdates: [string, callback][] = [];
+      let changesMade = false;
 
       for (const field of fields) {
         const name = field.getName();
@@ -164,6 +165,7 @@ class RenameFields implements ITool {
             `${colorize(name, "red")} -> ${colorize(preview, "green")}`,
             () => {
               applyRename(field, name, patternRegex, toChange);
+              changesMade = true;
             },
           ]);
         }
@@ -178,11 +180,15 @@ class RenameFields implements ITool {
         );
       }
 
+      if (changesMade) {
         const path = await cliPrompt(
           "Save to path (or hit enter to keep current):",
           this.block,
         );
         await savePdf(pdf, path || pdfPath);
+      } else {
+        cliLog("No changes made, skipping", this.block);
+      }
     }
   }
 }