fix: replace prisma.$use with $extends for Prisma 6 compatibility

prisma.$use middleware API was removed in Prisma 6. Switched to
$extends query hooks which is the supported approach.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

frontend/server/utils/prisma.ts

@@ -5,51 +5,72 @@ declare global {
   var __prisma: PrismaClient | undefined;
 }
 
-export const prisma =
+// ---------------------------------------------------------------------------
+// Auto-sync ClientTimelineEntry for CalendarEvent and FeedCard
+// ---------------------------------------------------------------------------
+const TIMELINE_MODEL_MAP: Record<string, string> = {
+  calendarEvent: "CALENDAR_EVENT",
+  feedCard: "RECOMMENDATION",
+};
+
+function timelineHook(model: string) {
+  const contentType = TIMELINE_MODEL_MAP[model];
+  if (!contentType) return undefined;
+
+  const afterMutate = (result: any) => {
+    if (!result || typeof result !== "object") return;
+    const row = result as Record<string, any>;
+    const teamId = row.teamId as string | undefined;
+    const contactId = row.contactId as string | undefined;
+    const id = row.id as string | undefined;
+    if (!teamId || !contactId || !id) return;
+
+    const datetime = row.startsAt ?? row.happenedAt ?? row.createdAt ?? new Date();
+
+    basePrisma.clientTimelineEntry
+      .upsert({
+        where: {
+          teamId_contentType_contentId: { teamId, contentType, contentId: id },
+        },
+        create: { teamId, contactId, contentType, contentId: id, datetime },
+        update: { contactId, datetime },
+        select: { id: true },
+      })
+      .catch(() => {});
+  };
+
+  return {
+    async create({ args, query }: any) {
+      const result = await query(args);
+      afterMutate(result);
+      return result;
+    },
+    async update({ args, query }: any) {
+      const result = await query(args);
+      afterMutate(result);
+      return result;
+    },
+    async upsert({ args, query }: any) {
+      const result = await query(args);
+      afterMutate(result);
+      return result;
+    },
+  };
+}
+
+const basePrisma =
   globalThis.__prisma ??
   new PrismaClient({
     log: ["error", "warn"],
   });
 
-// ---------------------------------------------------------------------------
-// Auto-sync ClientTimelineEntry for CalendarEvent, WorkspaceDocument, FeedCard
-// ---------------------------------------------------------------------------
-const TIMELINE_MODEL_MAP: Record<string, string> = {
-  CalendarEvent: "CALENDAR_EVENT",
-  FeedCard: "RECOMMENDATION",
-};
-
-prisma.$use(async (params, next) => {
-  const result = await next(params);
-
-  const contentType = params.model ? TIMELINE_MODEL_MAP[params.model] : undefined;
-  if (!contentType) return result;
-  if (params.action !== "create" && params.action !== "update" && params.action !== "upsert") return result;
-  if (!result || typeof result !== "object") return result;
-
-  const row = result as Record<string, any>;
-  const teamId = row.teamId as string | undefined;
-  const contactId = row.contactId as string | undefined;
-  const id = row.id as string | undefined;
-  if (!teamId || !contactId || !id) return result;
-
-  const datetime = row.startsAt ?? row.happenedAt ?? row.createdAt ?? new Date();
-
-  prisma.clientTimelineEntry
-    .upsert({
-      where: {
-        teamId_contentType_contentId: { teamId, contentType, contentId: id },
-      },
-      create: { teamId, contactId, contentType, contentId: id, datetime },
-      update: { contactId, datetime },
-      select: { id: true },
-    })
-    .catch(() => {});
-
-  return result;
-});
+export const prisma = basePrisma.$extends({
+  query: {
+    calendarEvent: timelineHook("calendarEvent")!,
+    feedCard: timelineHook("feedCard")!,
+  },
+}) as unknown as PrismaClient;
 
 if (process.env.NODE_ENV !== "production") {
-  globalThis.__prisma = prisma;
+  globalThis.__prisma = basePrisma;
 }
-