fix(webapp): restore the soft-delete import a rebase dropped

Author: kathiekiwi

apps/webapp/app/routes/resources.orgs.$organizationSlug.projects.$projectParam.env.$envParam.dashboard-agent.ts

@@ -16,6 +16,7 @@ import {
   readWatchWakeFeed,
   renameChat,
   setChatPinned,
+  softDeleteChat,
 } from "@internal/dashboard-agent-db";
 import { watchDraftSchema, type WatchDraft } from "@internal/dashboard-agent-contracts";
 import { generateFriendlyId } from "@trigger.dev/core/v3/isomorphic";