feat: Enhance frontend with theme support and offline capabilities

### Summary of Changes
- Introduced theme-aware CSS variables for consistent styling across light and dark modes.
- Updated `App.jsx` to manage theme settings and improve layout responsiveness.
- Refactored `OfflineMode` component to provide detailed connection status and quick actions for users.
- Enhanced `Dashboard`, `Settings`, and `SystemMetrics` components to utilize new theme variables and improve UI consistency.
- Updated service URLs in constants and API documentation to reflect new configurations.

### Expected Results
- Improved user experience with a cohesive design that adapts to user preferences.
- Enhanced offline functionality, providing users with better feedback and control during service outages.
- Streamlined codebase with consistent styling practices, making future updates easier.

services/service-adapters/main.py

@@ -11,7 +11,7 @@ app = FastAPI(
     version="1.0.0",
     license_info={"name": "MIT License", "url": "https://opensource.org/licenses/MIT"},
     servers=[
-        {"url": "http://localhost:8000", "description": "Development Server"},
+        {"url": "http://localhost:8001", "description": "Development Server"},
         {"url": "https://adapters.labfusion.dev", "description": "Production Server"},
     ],
 )
@@ -35,4 +35,4 @@ app.include_router(events.router)
 if __name__ == "__main__":
     import uvicorn
 
-    uvicorn.run(app, host="127.0.0.1", port=8000)
+    uvicorn.run(app, host="127.0.0.1", port=8001)