refactor: remove CursorAccountCard component and related localization entries

- Deleted the CursorAccountCard.vue component, which handled user account login and status.
- Removed associated localization entries from catalog.json and various language files.
- Updated Home.vue to eliminate references to the removed component.
- Refactored clientApi.js to remove unused account-related API functions.

internal/backend/forwarder/ai_handler_routes_test.go

@@ -0,0 +1,20 @@
+package forwarder
+
+import (
+	"testing"
+
+	"cursor/gen/aiserverv1/aiserverv1connect"
+)
+
+func TestAIHandlerTracksLocallyImplementedPaths(t *testing.T) {
+	handler := newAIHandler(&Service{})
+	if !handler.HandlesPath(aiserverv1connect.AiServiceCountTokensProcedure) {
+		t.Fatalf("expected %q to be handled locally", aiserverv1connect.AiServiceCountTokensProcedure)
+	}
+	if !handler.HandlesPath(dashboardServiceGetTokenUsageProcedure) {
+		t.Fatalf("expected %q to be handled locally", dashboardServiceGetTokenUsageProcedure)
+	}
+	if handler.HandlesPath("/aiserver.v1.AiService/UnknownProcedure") {
+		t.Fatal("unknown AI procedure must fall through to upstream")
+	}
+}