fix(pdf-server): refresh annotation panel after save rebases baseline

setDirty(false) updated the title and save button but the panel kept
showing pending-change badges because it diffs against
pdfBaselineAnnotations/FormValues and was never re-rendered.

Author: ochafik

examples/pdf-server/src/mcp-app.ts

@@ -3110,6 +3110,10 @@ async function savePdf(): Promise<void> {
       for (const [k, v] of formFieldValues) pdfBaselineFormValues.set(k, v);
 
       setDirty(false); // → updateSaveBtn() disables button
+      // Panel diffs against the baselines we just rebased — re-render so the
+      // "edited" badges and pending-change list go away.
+      updateAnnotationsBadge();
+      renderAnnotationPanel();
       const key = annotationStorageKey();
       if (key) {
         try {