added frontend for friendships, and fixed logic around conflicts

src/api/friends.ts

@@ -0,0 +1,24 @@
+import { apiFetch } from './client'
+import type { Friend, FriendRequest } from '../types/api'
+
+export function fetchFriends() {
+  return apiFetch<Friend[]>('/friends')
+}
+
+export function fetchFriendRequests() {
+  return apiFetch<FriendRequest[]>('/friends/requests')
+}
+
+export function sendFriendRequest(receiverUsername: string) {
+  return apiFetch<void>('/friends/request', {
+    method: 'POST',
+    body: JSON.stringify({ receiver_username: receiverUsername }),
+  });
+}
+
+export function acceptFriendRequest(senderUuid: string) {
+  return apiFetch<void>('/friends/accept', {
+    method: 'POST',
+    body: JSON.stringify({ sender_uuid: senderUuid }),
+  })
+}