fix: convert archivedAt string to Date before Drizzle update

The zod schema validates archivedAt as a datetime string, but Drizzle's
timestamp column expects a Date object. The string was passed directly to
db.update(), causing a 500 error. Now we convert the string to a Date
in the route handler before calling the service.

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

server/src/routes/projects.ts

@@ -116,7 +116,11 @@ export function projectRoutes(db: Db) {
       return;
     }
     assertCompanyAccess(req, existing.companyId);
-    const project = await svc.update(id, req.body);
+    const body = { ...req.body };
+    if (typeof body.archivedAt === "string") {
+      body.archivedAt = new Date(body.archivedAt);
+    }
+    const project = await svc.update(id, body);
     if (!project) {
       res.status(404).json({ error: "Project not found" });
       return;