feat: redesign mobile Config Profiles detail, preview, and edit pages

- Rewrite ConfigProfilesMobileView to match desktop functionality:
  full detail view with all fields, preview action showing resolved
  profile, and edit view with project/tool selects, includes,
  environment variables, runtime hints, files, mounts with nested
  files, and git mounts.
- Update useConfigProfiles.handleSubmit to return boolean success.
- Update ConfigProfilesPage to pass required state and callbacks.
- Add mobile-specific CSS for config profile forms, includes,
  mount/file cards, and preview panels.
- Allow MobileDetailView to render extra children.

Quality gates: npm run typecheck, npm run lint, npm test -- --run (87 passed)

Refs: openspec/changes/mobile-config-profiles-ui

apps/web/src/hooks/use-config-profiles.ts

@@ -193,7 +193,7 @@ export const useConfigProfiles = () => {
 		setDragOverIndex(null);
 	};
 
-	const handleSubmit = async (e?: React.FormEvent) => {
+	const handleSubmit = async (e?: React.FormEvent): Promise<boolean> => {
 		e?.preventDefault();
 		setError(null);
 		setSaveStatus("saving");
@@ -201,7 +201,7 @@ export const useConfigProfiles = () => {
 		if (!formData.name?.trim()) {
 			setError("Name is required");
 			setSaveStatus("error");
-			return;
+			return false;
 		}
 
 		try {
@@ -224,9 +224,11 @@ export const useConfigProfiles = () => {
 				const refreshed = (await listConfigProfiles()).find((p) => p.id === selectedProfile.id);
 				if (refreshed) populateForm(refreshed);
 			}
+			return true;
 		} catch (err) {
 			setError(extractErrorMessage(err));
 			setSaveStatus("error");
+			return false;
 		}
 	};