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/cli-tools/components/AntigravityToolCard.js

@@ -38,15 +38,10 @@ export default function AntigravityToolCard({
   }, [initialStatus]);
 
   useEffect(() => {
-    if (isExpanded && !status) {
-      fetchStatus();
-      loadSavedMappings();
-      fetchModelAliases();
-    }
-    if (isExpanded) {
-      loadSavedMappings();
-      fetchModelAliases();
-    }
+    if (!isExpanded) return;
+    if (!status) fetchStatus();
+    loadSavedMappings();
+    fetchModelAliases();
   }, [isExpanded]);
 
   const loadSavedMappings = async () => {
@@ -243,6 +238,8 @@ export default function AntigravityToolCard({
               className="size-8 object-contain rounded-lg"
               sizes="32px"
               onError={(e) => { e.target.style.display = "none"; }}
+            loading="lazy"
+            decoding="async"
             />
           </div>
           <div className="min-w-0">
@@ -467,15 +464,17 @@ export default function AntigravityToolCard({
       </Modal>
 
       {/* Model Select Modal */}
-      <ModelSelectModal
-        isOpen={modalOpen}
-        onClose={() => setModalOpen(false)}
-        onSelect={handleModelSelect}
-        selectedModel={currentEditingAlias ? modelMappings[currentEditingAlias] : null}
-        activeProviders={activeProviders}
-        modelAliases={modelAliases}
-        title={`Select model for ${currentEditingAlias}`}
-      />
+      {modalOpen && (
+        <ModelSelectModal
+          isOpen={modalOpen}
+          onClose={() => setModalOpen(false)}
+          onSelect={handleModelSelect}
+          selectedModel={currentEditingAlias ? modelMappings[currentEditingAlias] : null}
+          activeProviders={activeProviders}
+          modelAliases={modelAliases}
+          title={`Select model for ${currentEditingAlias}`}
+        />
+      )}
     </Card>
   );
 }