fix(phase3): add $autoCancel:false to prevent SDK auto-cancellation

PocketBase JS SDK auto-cancels pending requests when a new request
targets the same collection. This causes errors when loadLedgers and
getLedgerSummary run in parallel via Promise.all. Added $autoCancel:false
to all API calls in ledgers.ts and assets.ts, matching project convention.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

frontend/src/api/assets.ts

@@ -25,14 +25,15 @@ export async function createAsset(data: CreateAssetData): Promise<Asset> {
   if (data.description) formData.append('description', data.description)
   if (data.image) formData.append('image', data.image)
 
-  return pb.collection('assets').create(formData) as Promise<Asset>
+  return pb.collection('assets').create(formData, { $autoCancel: false }) as Promise<Asset>
 }
 
 export async function listAssets(groupId: string): Promise<Asset[]> {
   const result = await pb.collection('assets').getFullList({
     filter: `group="${groupId}"`,
     sort: 'created',
-    expand: 'creator,currentHolder'
+    expand: 'creator,currentHolder',
+    $autoCancel: false
   })
   return result as unknown as Asset[]
 }
@@ -49,20 +50,20 @@ export async function updateAsset(
     if (data.description !== undefined) formData.append('description', data.description)
     formData.append('image', image)
 
-    return pb.collection('assets').update(assetId, formData) as Promise<Asset>
+    return pb.collection('assets').update(assetId, formData, { $autoCancel: false }) as Promise<Asset>
   }
 
-  return pb.collection('assets').update(assetId, data) as Promise<Asset>
+  return pb.collection('assets').update(assetId, data, { $autoCancel: false }) as Promise<Asset>
 }
 
 export async function transferAsset(assetId: string, userId: string): Promise<Asset> {
   return pb.collection('assets').update(assetId, {
     currentHolder: userId
-  }) as Promise<Asset>
+  }, { $autoCancel: false }) as Promise<Asset>
 }
 
 export async function deleteAsset(assetId: string): Promise<void> {
-  await pb.collection('assets').delete(assetId)
+  await pb.collection('assets').delete(assetId, { $autoCancel: false })
 }
 
 export function subscribeAssets(