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

store/settings-store.ts

@@ -159,7 +159,7 @@ const initialState = {
     timeout: 10,
     excludedDomains: ['youtube.com', 'linkedin.com'],
     maxConcurrentTabs: 5,
-    totalSourcesLimit: 40,
+    totalSourcesLimit: 100,
     categories: defaultCategories,
     userCustomSites: [],
   },