fix(dashboard): cut duplicate API/icon spam, lazy-load provider assets

Share one /api/models fetch via useModelCaps cache, mount ModelSelectModal
only when open, stop double fetchModelAliases on CLI tool cards, and resolve
provider icons through a session 404 cache with missing PNGs + loading=lazy.
Also include Claude Exa MCP toggle (claude-settings + ClaudeToolCard) that
was already in the working tree.

Co-authored-by: Cursor <cursoragent@cursor.com>

src/app/(dashboard)/dashboard/providers/components/ModelsCard.js

@@ -116,26 +116,22 @@ export default function ModelsCard({ providerId, kindFilter, providerAliasOverri
   const [testingModelId, setTestingModelId] = useState(null);
   const [testError, setTestError] = useState("");
   const [showAddCustomModel, setShowAddCustomModel] = useState(false);
-  const [connections, setConnections] = useState([]);
 
   const providerAlias = providerAliasOverride || getProviderAlias(providerId);
   const effectiveType = kindFilter || "llm";
 
   const fetchData = useCallback(async () => {
     try {
-      const [aliasRes, connRes, customRes] = await Promise.all([
+      const [aliasRes, customRes] = await Promise.all([
         fetch("/api/models/alias"),
-        fetch("/api/providers", { cache: "no-store" }),
         fetch("/api/models/custom", { cache: "no-store" }),
       ]);
       const aliasData = await aliasRes.json();
-      const connData = await connRes.json();
       const customData = await customRes.json();
       if (aliasRes.ok) setModelAliases(aliasData.aliases || {});
-      if (connRes.ok) setConnections((connData.connections || []).filter((c) => c.provider === providerId));
       if (customRes.ok) setCustomModels(customData.models || []);
     } catch (e) { console.log("ModelsCard fetch error:", e); }
-  }, [providerId]);
+  }, []);
 
   useEffect(() => { fetchData(); }, [fetchData]);
 
@@ -242,7 +238,7 @@ export default function ModelsCard({ providerId, kindFilter, providerAliasOverri
                 onSetAlias={(alias) => handleSetAlias(model.id, alias)}
                 onDeleteAlias={() => handleDeleteAlias(existingAlias)}
                 testStatus={modelTestResults[model.id]}
-                onTest={connections.length > 0 ? () => handleTestModel(model.id) : undefined}
+                onTest={() => handleTestModel(model.id)}
                 isTesting={testingModelId === model.id}
                 isFree={model.isFree}
               />
@@ -259,7 +255,7 @@ export default function ModelsCard({ providerId, kindFilter, providerAliasOverri
               onSetAlias={() => {}}
               onDeleteAlias={() => handleDeleteCustomModel(model.id)}
               testStatus={modelTestResults[model.id]}
-              onTest={connections.length > 0 ? () => handleTestModel(model.id) : undefined}
+              onTest={() => handleTestModel(model.id)}
               isTesting={testingModelId === model.id}
               isCustom
             />