Began implementation for getting promotion history

ui/src/api/rank.ts

@@ -1,4 +1,6 @@
+import { BatchPromotion } from '@shared/schemas/promotionSchema';
 import { Rank } from '@shared/types/rank'
+
 //  @ts-ignore
 const addr = import.meta.env.VITE_APIHOST;
 
@@ -15,19 +17,19 @@ export async function getAllRanks(): Promise<Rank[]> {
 }
 
 // Placeholder: submit a rank change
-export async function submitRankChange(member_id: number, rank_id: number, date: string): Promise<{ ok: boolean }> {
+export async function submitRankChange(promo: BatchPromotion) {
   const res = await fetch(`${addr}/memberRanks`, {
     method: "POST",
     headers: {
       "Content-Type": "application/json",
     },
-    body: JSON.stringify({ change: { member_id, rank_id, date } }),
+    credentials: 'include',
+    body: JSON.stringify(promo),
   })
 
   if (res.ok) {
-    return { ok: true }
+    return
   } else {
-    console.error("Failed to submit rank change")
-    return { ok: false }
+    throw new Error("Failed to submit rank change: Server error");
   }
 }