feat: mobile tool workshop with list-detail pattern

- Add mobile viewport detection to ToolWorkshopPage
- Implement mobile list view with MobileListView component
- Implement mobile detail view with MobileDetailView component
- Implement mobile edit view with MobileEditView component
- Add MobileFAB for creating new tool types
- Fix IconName type issues in mobile components
- TypeScript check passes, build succeeds

apps/web/src/components/mobile-fab.tsx

@@ -0,0 +1,22 @@
+import { Icon } from "./icon";
+
+interface MobileFABProps {
+  onClick: () => void;
+  label?: string;
+}
+
+export const MobileFAB: React.FC<MobileFABProps> = ({
+  onClick,
+  label = "Create new",
+}) => {
+  return (
+    <button
+      className="mobile-fab"
+      onClick={onClick}
+      type="button"
+      aria-label={label}
+    >
+      <Icon name="add" size="md" />
+    </button>
+  );
+};