feat: enhance terminal functionality and settings

- Added new endpoints for terminal settings: GET and PUT /settings to retrieve and update terminal configurations.
- Implemented session limit checks during session creation, returning a 429 status when the limit is reached.
- Introduced a new TerminalSection in settings view for customizing terminal appearance and behavior, including font family, default font size, line height, and screen reader mode.
- Added support for new terminal features such as search functionality and improved error handling with a TerminalErrorBoundary component.
- Updated terminal layout persistence to include session IDs for reconnection and enhanced terminal state management.
- Introduced new keyboard shortcuts for terminal actions, including creating new terminal tabs.
- Enhanced UI with scrollbar theming for terminal components.

apps/ui/src/components/views/settings-view.tsx

@@ -12,6 +12,7 @@ import { ApiKeysSection } from "./settings-view/api-keys/api-keys-section";
 import { ClaudeCliStatus } from "./settings-view/cli-status/claude-cli-status";
 import { AIEnhancementSection } from "./settings-view/ai-enhancement";
 import { AppearanceSection } from "./settings-view/appearance/appearance-section";
+import { TerminalSection } from "./settings-view/terminal/terminal-section";
 import { AudioSection } from "./settings-view/audio/audio-section";
 import { KeyboardShortcutsSection } from "./settings-view/keyboard-shortcuts/keyboard-shortcuts-section";
 import { FeatureDefaultsSection } from "./settings-view/feature-defaults/feature-defaults-section";
@@ -108,6 +109,8 @@ export function SettingsView() {
             onThemeChange={handleSetTheme}
           />
         );
+      case "terminal":
+        return <TerminalSection />;
       case "keyboard":
         return (
           <KeyboardShortcutsSection