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Replace every hardcoded English string across all 35 SPA page files with useT() calls backed by message keys in messages.ts. Both en-US and zh-CN translations are provided for every key (~200 new keys). Pages updated: DashboardPage, LoginPage, FormDesignerPage, ListViewDesignerPage, MetadataAdminPage, SalesOrderDetailPage, PurchaseOrderDetailPage, WorkOrderDetailPage, ShopFloorPage, UserTasksPage, TaskDetailPage, UserDetailPage, all Create* pages, all Edit* pages, and all list pages (Items, Partners, Locations, Balances, Movements, SalesOrders, PurchaseOrders, WorkOrders, Users, Roles, Accounts, JournalEntries, UoMs, AdjustStock).
