fix: resolve TypeScript build errors in landing page

- Exclude IC-related files from landing page tsconfig (unused dependencies)
- Remove unused Lock import from LandingPage.tsx
- Landing page should be buildable without IC dependencies

Author: domwoe

src/btc_vault_landing/src/LandingPage.tsx

@@ -4,7 +4,6 @@ import { ThemeSwitcher } from "@/components/theme-switcher";
 import { getExternalLinks } from "@/lib/config";
 import {
   Shield,
-  Lock,
   Zap,
   TrendingUp,
   DollarSign,

src/btc_vault_landing/tsconfig.json

@@ -26,5 +26,12 @@
       "@/*": ["./src/*"]
     }
   },
-  "include": ["src"]
+  "include": ["src"],
+  "exclude": [
+    "src/contexts/siwb-auth-context.tsx",
+    "src/declarations",
+    "src/actors",
+    "src/services/auth-service.ts",
+    "src/types/vault.ts"
+  ]
 }