ui/phase-17: ship-class CRUD without calc

Phase 17 lights up the ship-class table and designer active views,
extends the order-draft pipeline with createShipClass and
removeShipClass commands, and projects pending Save/Delete actions
through applyOrderOverlay so the table reflects the player's
intent before auto-sync lands. The plan is corrected in the same
patch: per game/rules.txt, ship classes are designed once and
cannot be edited — the engine has no Update command, so the UI
exposes only Create + Delete.

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

ui/frontend/src/lib/sidebar/order-tab.svelte

@@ -69,6 +69,14 @@ Tests exercise the tab through `__galaxyDebug.seedOrderDraft`
 					loadType: cmd.loadType,
 					source: String(cmd.sourcePlanetNumber),
 				});
+			case "createShipClass":
+				return i18n.t("game.sidebar.order.label.ship_class_create", {
+					name: cmd.name,
+				});
+			case "removeShipClass":
+				return i18n.t("game.sidebar.order.label.ship_class_remove", {
+					name: cmd.name,
+				});
 		}
 	}