ui/phase-12: order composer skeleton

OrderDraftStore persists per-game command drafts in Cache; the
sidebar Order tab renders the list with a per-row delete control.
The layout passes a `historyMode` prop through Sidebar / BottomTabs
as a constant `false`, so Phase 26 only flips the source.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

ui/README.md

@@ -65,6 +65,7 @@ ui/
 ├── docs/                    topic-based design notes
 │   ├── auth-flow.md         email-code login, session store, revocation
 │   ├── i18n.md              translation primitive, native-name picker, extensibility
+│   ├── order-composer.md    order draft model, persistence, history-mode wiring
 │   ├── storage.md           web KeyStore/Cache, IDB schema, baseline
 │   ├── testing.md           per-PR / release test tiers
 │   └── wasm-toolchain.md    TinyGo build, JSDOM loading, bundle budget
@@ -90,6 +91,8 @@ Linked topic docs:
   language picker, recipe for adding a new locale.
 - [`docs/storage.md`](docs/storage.md) — web KeyStore/Cache,
   IndexedDB schema, browser baseline.
+- [`docs/order-composer.md`](docs/order-composer.md) — local
+  order draft store, persistence, history-mode wiring.
 - [`docs/wasm-toolchain.md`](docs/wasm-toolchain.md) — TinyGo build,
   loading recipe, bundle size budget.
 - [`docs/testing.md`](docs/testing.md) — Tier 1 per-PR + Tier 2