feat(client): add native template slots and safe cloud version restore
Support explicit current-output A/B fill, protected edited drafts, scoped cloud update offers and atomic native restore with stale-open CAS. Preserve original unknown requests, improve Pi conversation continuity and native DPI/navigation reads, and publish the authenticated template metadata contract.
Validated: native backend 172 passed/5 environment tests ignored, UI 110, Pi 53, template/rule API 24 and native cloud contract 6; strict Clippy, layering and wasm. Real S01 selected B, edited/undo-redo, PCraft reopen and layered PSD roundtrip pass with exact pixels. Full nine-output generation and Photoshop acceptance remain open.
WuYongJie
93fc28f1bb