ui/phase-21: sciences CRUD list, designer, and production-picker integration

Lights up the player-defined sciences feature: a table view with sort
and filter, a designer with four percent inputs and a strict
sum-equals-100 gate, and a Research-sub-row integration so the
planet production picker lists the user's sciences alongside the
four tech buttons. Phase 21 decisions are baked back into ui/PLAN.md
(no UpdateScience on the wire — write-once via createScience +
removeScience; percentages instead of fractions; sciences live under
the existing Research segment).

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

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

@@ -77,6 +77,14 @@ Tests exercise the tab through `__galaxyDebug.seedOrderDraft`
 				return i18n.t("game.sidebar.order.label.ship_class_remove", {
 					name: cmd.name,
 				});
+			case "createScience":
+				return i18n.t("game.sidebar.order.label.science_create", {
+					name: cmd.name,
+				});
+			case "removeScience":
+				return i18n.t("game.sidebar.order.label.science_remove", {
+					name: cmd.name,
+				});
 			case "breakShipGroup":
 				return i18n.t("game.sidebar.order.label.ship_group_break", {
 					group: shortGroupId(cmd.groupId),