Remove unused FormRow

diff --git a/ui/src/plugins/dev.perfetto.WidgetsPage/demos/form_demo.ts b/ui/src/plugins/dev.perfetto.WidgetsPage/demos/form_demo.ts
index 5c0022c..f33c48e 100644
--- a/ui/src/plugins/dev.perfetto.WidgetsPage/demos/form_demo.ts
+++ b/ui/src/plugins/dev.perfetto.WidgetsPage/demos/form_demo.ts

@@ -18,7 +18,7 @@
 import {Checkbox} from '../../../widgets/checkbox';
 import {
   Form,
-  FormAttrs,
+  type FormAttrs,
   FormGrid,
   FormLabel,
   FormSection,

diff --git a/ui/src/widgets/form.scss b/ui/src/widgets/form.scss
index 423303f..618d51b 100644
--- a/ui/src/widgets/form.scss
+++ b/ui/src/widgets/form.scss

@@ -33,11 +33,6 @@
     margin-bottom: -4px;
   }
 
-  &__row {
-    display: grid;
-    gap: 8px 16px;
-  }
-
   &__grid {
     display: grid;
     grid-template-columns: auto 1fr;

diff --git a/ui/src/widgets/form.ts b/ui/src/widgets/form.ts
index 5fd38e9..e796566 100644
--- a/ui/src/widgets/form.ts
+++ b/ui/src/widgets/form.ts

@@ -151,29 +151,6 @@
   }
 }
 
-export interface FormRowAttrs extends HTMLAttrs {
-  // Number of columns in the grid layout (default: 2)
-  columns?: number;
-}
-
-// A container for placing multiple FormLabel elements side by side in a grid.
-export class FormRow implements m.ClassComponent<FormRowAttrs> {
-  view({attrs, children}: m.CVnode<FormRowAttrs>) {
-    const {columns = 2, ...htmlAttrs} = attrs;
-    return m(
-      '.pf-form__row',
-      {
-        ...htmlAttrs,
-        style: {
-          gridTemplateColumns: `repeat(${columns}, auto 1fr)`,
-          ...(htmlAttrs.style as object),
-        },
-      },
-      children,
-    );
-  }
-}
-
 // A two-column grid container where labels align on the left and inputs
 // stretch to fill the right column. Place FormLabel and input elements
 // as direct children - they will automatically align in rows.

diff --git a/ui/src/widgets/multiselect.ts b/ui/src/widgets/multiselect.ts
index 0020ce7..18a6a65 100644
--- a/ui/src/widgets/multiselect.ts
+++ b/ui/src/widgets/multiselect.ts

@@ -15,7 +15,7 @@
 import './multiselect.scss';
 import m from 'mithril';
 import {Icons} from '../base/semantic_icons';
-import {Button, ButtonVariant} from './button';
+import {Button, type ButtonVariant} from './button';
 import {Checkbox} from './checkbox';
 import {EmptyState} from './empty_state';
 import {Popup, PopupPosition} from './popup';