feat(ui): enhance chat UI with new components and styling

refactor(chat): improve message display and actions
feat(chat): add high contrast mode toggle
style(chat): update spacing and sizing for better readability
feat(chat): add new Section and Stack layout components
docs: add UI style guide documentation
fix(chat): improve browser connection handling in scraper
feat(settings): expand default sources and improve UI
refactor: consolidate chat page layout and components

components/chat/prompt-generator.tsx

@@ -130,7 +130,7 @@ export function PromptGeneratorDialog({ defaultModel, onPromptGenerated }: Promp
               value={goal}
               onChange={(e) => setGoal(e.target.value)}
               placeholder="Ex: Quero um assistente especialista em Python que explique conceitos complexos de forma simples..."
-              className="min-h-[150px]"
+              className="min-h-[160px]"
               disabled={isGenerating}
             />
           </div>