feat: Add photo management features, duplicate detection, attempt limits, and admin deletion

- Add duplicate photo detection (file hash and URL checking)
- Add max attempts per photo with UI counter
- Simplify penalty system (auto-enable when points > 0)
- Prevent scores from going below 0
- Add admin photo deletion functionality
- Improve navigation with always-visible logout
- Prevent users from guessing their own photos

types/jest-dom.d.ts

@@ -0,0 +1 @@
+import '@testing-library/jest-dom'

types/next-auth.d.ts

@@ -0,0 +1,27 @@
+import "next-auth"
+import "next-auth/jwt"
+
+declare module "next-auth" {
+  interface Session {
+    user: {
+      id: string
+      email: string
+      name: string
+      role: string
+    }
+  }
+
+  interface User {
+    id: string
+    email: string
+    name: string
+    role: string
+  }
+}
+
+declare module "next-auth/jwt" {
+  interface JWT {
+    id: string
+    role: string
+  }
+}