refactor: Consolidate dashboard response handling into a single function

src/arbitrade/api/routes.py

@@ -218,11 +218,10 @@ def _form_bool(value: str | None) -> bool:
     return value.lower() in {"1", "true", "yes", "on"}
 
 
-@router.get("/", response_class=HTMLResponse)
-async def home(request: Request) -> HTMLResponse:
+async def _dashboard_response(request: Request, template_name: str = "dashboard.html") -> HTMLResponse:
     return templates.TemplateResponse(
         request=request,
-        name="dashboard.html",
+        name=template_name,
         context={
             "title": "Arbitrade Dashboard",
             "request": request,
@@ -236,22 +235,14 @@ async def home(request: Request) -> HTMLResponse:
     )
 
 
+@router.get("/", response_class=HTMLResponse)
+async def home(request: Request) -> HTMLResponse:
+    return await _dashboard_response(request)
+
+
 @router.get("/dashboard", response_class=HTMLResponse)
 async def dashboard(request: Request) -> HTMLResponse:
-    return templates.TemplateResponse(
-        request=request,
-        name="dashboard.html",
-        context={
-            "title": "Arbitrade Dashboard",
-            "request": request,
-            "metrics_endpoint": "/dashboard/fragment/metrics",
-            "overview_endpoint": "/dashboard/fragment/overview",
-            "controls_endpoint": "/dashboard/fragment/controls",
-            "charts_endpoint": "/dashboard/fragment/charts",
-            "stream_endpoint": "/dashboard/stream/metrics",
-            "overview_stream_endpoint": "/dashboard/stream/overview",
-        },
-    )
+    return await _dashboard_response(request)
 
 
 @router.get("/dashboard/fragment/metrics", response_class=HTMLResponse)