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/shared/components/Header.js

@@ -12,6 +12,7 @@ import DonateModal from "@/shared/components/DonateModal";
 import { useHeaderSearchStore } from "@/store/headerSearchStore";
 import { OAUTH_PROVIDERS, APIKEY_PROVIDERS } from "@/shared/constants/config";
 import { MEDIA_PROVIDER_KINDS, AI_PROVIDERS } from "@/shared/constants/providers";
+import { getProviderIconSrc } from "@/shared/utils/providerIcon";
 import { translate } from "@/i18n/runtime";
 
 const getPageInfo = (pathname) => {
@@ -30,7 +31,7 @@ const getPageInfo = (pathname) => {
       breadcrumbs: [
         { label: "Media Providers", href: `/dashboard/media-providers/${kindId}` },
         { label: kindConfig?.label || kindId, href: `/dashboard/media-providers/${kindId}` },
-        { label: provider?.name || providerId, image: `/providers/${providerId}.png` },
+        { label: provider?.name || providerId, image: getProviderIconSrc(providerId) },
       ],
     };
   }
@@ -62,7 +63,7 @@ const getPageInfo = (pathname) => {
           { label: "Providers", href: "/dashboard/providers" },
           {
             label: providerInfo.name,
-            image: `/providers/${providerInfo.id}.png`,
+            image: getProviderIconSrc(providerInfo.id),
           },
         ],
       };