feat(FN-779): make inline editor taller with 4-row default and mount-time resize

- Increase inline editor textarea default rows from 1 to 4 for better multi-line editing
- Add mount-time auto-resize to fit content on initial render
- Add regression tests for taller inline editor behavior
- Update documentation to reflect the new taller editor defaults

packages/dashboard/app/styles.css

@@ -3974,7 +3974,7 @@ body {
   resize: none;
   overflow: hidden;
   line-height: 1.4;
-  min-height: 38px;
+  min-height: 80px;
   transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
 }