chore: move eslint ignores and fix onboarding typing

frontend/.eslintignore

@@ -1,3 +0,0 @@
-tailwind.config.*
-postcss.config.*
-orval.config.*

frontend/src/components/BoardOnboardingChat.tsx

@@ -24,6 +24,8 @@ type BoardDraft = {
 
 type BoardSummary = {
   id: string;
+  name: string;
+  slug: string;
   board_type?: string;
   objective?: string | null;
   success_metrics?: Record<string, unknown> | null;