Refactor global styles and enhance MITM functionality

- Updated global CSS to implement a new brand color palette and improve light/dark theme consistency.
- Enhanced the MitmServerCard component to provide clearer user feedback regarding admin privileges.
- Filtered LLM combos in the CombosPage to ensure only relevant data is displayed.
- Improved APIPageClient layout for better usability and visual consistency.
- Added functionality to save and load DNS tool states in the MITM manager.
- Updated OAuth configuration URLs for Qwen to reflect the new endpoint structure.
- Refined tunnel management logic to improve reliability and user experience.

src/lib/localDb.js

@@ -36,6 +36,7 @@ const DEFAULT_SETTINGS = {
   outboundProxyUrl: "",
   outboundNoProxy: "",
   mitmRouterBaseUrl: DEFAULT_MITM_ROUTER_BASE,
+  dnsToolEnabled: {},
   rtkEnabled: true,
   cavemanEnabled: false,
   cavemanLevel: "full",