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src/components/category/CategoryTree.jsx

@@ -749,13 +749,27 @@ export default class CategoryTree extends PureComponent {
             >
               Abbrechen
             </Button>
-            <Button
-              onClick={this.handleConfirmRename}
-              variant="contained"
-              disabled={!renameValue.trim() || isSubmitting}
-            >
-              Speichern
-            </Button>
+            {(() => {
+              const canSave =
+                Boolean(renameValue.trim()) &&
+                !isSubmitting &&
+                renameValue.trim() !== (renameTarget?.name ?? '').trim();
+              return (
+                <Button
+                  onClick={this.handleConfirmRename}
+                  variant="contained"
+                  color={canSave ? 'success' : 'inherit'}
+                  disabled={!canSave}
+                  sx={
+                    canSave
+                      ? { bgcolor: 'success.main', color: '#fff', '&:hover': { bgcolor: 'success.dark' } }
+                      : undefined
+                  }
+                >
+                  Speichern
+                </Button>
+              );
+            })()}
           </DialogActions>
         </AppDialog>