Stop party sync feedback loop causing repeated PATCH overfetch.

Cache FunZone snapshot sync keys and harden partyNeedsSync comparisons so purchases/suppliers no longer re-patch the same party on every store update.

src/parties/GlobalPartySync.tsx

@@ -9,7 +9,7 @@ import { findExistingParty, mergeFunZoneParties, partyNeedsSync } from './funzon
 
 /** Syncs FunZone owners/customers into accounting parties on app load. */
 export function GlobalPartySync() {
-  const { ready, upsertPartyAsync, reload } = useStore()
+  const { ready, upsertPartyAsync } = useStore()
   const synced = useRef(false)
 
   useEffect(() => {
@@ -36,16 +36,21 @@ export function GlobalPartySync() {
         for (const incoming of batches) {
           const existing = findExistingParty(currentParties, incoming.externalId!, incoming.externalSource)
           if (existing && !partyNeedsSync(existing, incoming)) continue
-          await upsertPartyAsync({ ...incoming, id: existing?.id ?? createId('party-') })
+          const next = { ...incoming, id: existing?.id ?? createId('party-') }
+          await upsertPartyAsync(next)
+          // Keep the local snapshot in sync so later comparisons in this pass don't re-PATCH.
+          currentParties = existing
+            ? currentParties.map((p) => (p.id === existing.id ? { ...p, ...next } : p))
+            : [...currentParties, next]
         }
-        reload()
+        // upsertPartyAsync already updates AppStore; avoid a full reload that re-fetches every resource.
       } catch {
         synced.current = false
       }
     }
 
     void run()
-  }, [ready, upsertPartyAsync, reload])
+  }, [ready, upsertPartyAsync])
 
   return null
 }