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/frontend/tests/e2e/storage-keypair-persistence.spec.ts

@@ -13,6 +13,10 @@ interface DebugSnapshot {
 	deviceSessionId: string | null;
 }
 
+// Mirrors the surface mounted by `routes/__debug/store/+page.svelte`.
+// Other Playwright specs (`game-shell.spec.ts`, `order-composer.spec.ts`)
+// reuse the global declaration below, so this interface lists every
+// helper any spec calls — not only those exercised by this file.
 interface DebugSurface {
 	ready: true;
 	loadSession(): Promise<DebugSnapshot>;
@@ -23,6 +27,15 @@ interface DebugSurface {
 		message: number[],
 		signature: number[],
 	): Promise<boolean>;
+	seedOrderDraft(
+		gameId: string,
+		commands: ReadonlyArray<{
+			kind: "placeholder";
+			id: string;
+			label: string;
+		}>,
+	): Promise<void>;
+	clearOrderDraft(gameId: string): Promise<void>;
 }
 
 declare global {