style: add shared content width constraint to AI provider edit pages

src/pages/AiProvidersGeminiEditPage.tsx

@@ -13,6 +13,7 @@ import type { GeminiKeyConfig } from '@/types';
 import { buildHeaderObject, headersToEntries } from '@/utils/headers';
 import { excludedModelsToText, parseExcludedModels } from '@/components/providers/utils';
 import type { GeminiFormState } from '@/components/providers';
+import layoutStyles from './AiProvidersEditLayout.module.scss';
 
 type LocationState = { fromAiProviders?: boolean } | null;
 
@@ -176,6 +177,7 @@ export function AiProvidersGeminiEditPage() {
   return (
     <SecondaryScreenShell
       ref={swipeRef}
+      contentClassName={layoutStyles.content}
       title={title}
       onBack={handleBack}
       backLabel={t('common.back')}