feat: add flash message support to configuration panel and improve layout

src/arbitrade/api/routes.py

@@ -1042,6 +1042,13 @@ async def dashboard_backtesting_run(request: Request) -> HTMLResponse:
             message=str(exc),
             defaults=defaults,
         )
+    except Exception as exc:
+        context = await _backtesting_panel_context(
+            request,
+            status="failed",
+            message=f"Unexpected error: {exc}",
+            defaults=defaults,
+        )
 
     return templates.TemplateResponse(
         request=request,
@@ -1280,10 +1287,12 @@ async def dashboard_control_config(request: Request) -> HTMLResponse:
         },
     )
 
+    d_context = await _dashboard_config_context(request)
+    d_context["flash_message"] = "Configuration saved successfully."
     return templates.TemplateResponse(
         request=request,
-        name="partials/controls.html",
-        context={"request": request, **_dashboard_controls(request)},
+        name="partials/config.html",
+        context={"request": request, **d_context},
     )
 
 

src/arbitrade/web/templates/partials/config.html

@@ -1,15 +1,35 @@
 <div id="config-panel" class="panel" style="margin-top: 16px">
+  {% if flash_message %}
+  <div
+    class="flash"
+    style="
+      background: rgba(82, 196, 26, 0.15);
+      border: 1px solid rgba(82, 196, 26, 0.3);
+      border-radius: 8px;
+      padding: 10px 16px;
+      margin-bottom: 16px;
+      color: #b7eb8f;
+      font-size: 0.9rem;
+    "
+    hx-trigger="load delay:3s"
+    hx-target="this"
+    hx-swap="delete"
+  >
+    {{ flash_message }}
+  </div>
+  {% endif %}
   <form
     class="form-grid"
     hx-post="{{ config_endpoint }}"
     hx-target="#config-panel"
     hx-swap="outerHTML"
-    style="grid-template-columns: repeat(auto-fit, minmax(320px, 1fr)); gap: 20px"
+    style="
+      grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
+      gap: 20px;
+    "
   >
-    {% include "config/runtime.html" %}
-    {% include "config/alerts.html" %}
-    {% include "config/kraken.html" %}
-    {% include "config/risk.html" %}
+    {% include "config/runtime.html" %} {% include "config/alerts.html" %} {%
+    include "config/kraken.html" %} {% include "config/risk.html" %}
     <div style="grid-column: 1 / -1">
       <button type="submit" class="button">Save Settings</button>
     </div>