ui/phase-16: cargo routes inspector + map pick foundation

Add per-planet cargo routes (COL/CAP/MAT/EMP) to the inspector with
a renderer-driven destination picker (faded out-of-reach planets,
cursor-line anchor, hover-highlight) and per-route arrows on the
map. The pick-mode primitives are exposed via `MapPickService` so
ship-group dispatch in Phase 19/20 can reuse the same surface.

Pass A — generic map foundation:
- hit-test now sizes the click zone to `pointRadiusPx + slopPx` so
  the visible disc is always part of the target.
- `RendererHandle` gains `onPointerMove`, `onHoverChange`,
  `setPickMode`, `getPickState`, `getPrimitiveAlpha`,
  `setExtraPrimitives`, `getPrimitives`. The click dispatcher is
  centralised: pick-mode swallows clicks atomically so the standard
  selection consumers do not race against teardown.
- `MapPickService` (`lib/map-pick.svelte.ts`) wraps the renderer
  contract in a promise-shaped `pick(...)`. The in-game shell
  layout owns the service so sidebar and bottom-sheet inspectors
  see the same instance.
- Debug-surface registry exposes `getMapPrimitives`,
  `getMapPickState`, `getMapCamera` to e2e specs without spawning a
  separate debug page after navigation.

Pass B — cargo-route feature:
- `CargoLoadType`, `setCargoRoute`, `removeCargoRoute` typed
  variants with `(source, loadType)` collapse rule on the order
  draft; round-trip through the FBS encoder/decoder.
- `GameReport` decodes `routes` and the local player's drive tech
  for the inline reach formula (40 × drive). `applyOrderOverlay`
  upserts/drops route entries for valid/submitting/applied
  commands.
- `lib/inspectors/planet/cargo-routes.svelte` renders the
  four-slot section. `Add` / `Edit` call `MapPickService.pick`,
  `Remove` emits `removeCargoRoute`.
- `map/cargo-routes.ts` builds shaft + arrowhead primitives per
  cargo type; the map view pushes them through
  `setExtraPrimitives` so the renderer never re-inits Pixi on
  route mutations (Pixi 8 doesn't support that on a reused
  canvas).

Docs:
- `docs/cargo-routes-ux.md` covers engine semantics + UI map.
- `docs/renderer.md` documents pick mode and the debug surface.
- `docs/calc-bridge.md` records the Phase 16 reach waiver.
- `PLAN.md` rewrites Phase 16 to reflect the foundation + feature
  split and the decisions baked in (map-driven picker, inline
  reach, optimistic overlay via `setExtraPrimitives`).

Tests:
- `tests/map-pick-mode.test.ts` — pure overlay-spec helper.
- `tests/map-cargo-routes.test.ts` — `buildCargoRouteLines`.
- `tests/inspector-planet-cargo-routes.test.ts` — slot rendering,
  picker invocation, collapse, cancel, remove.
- Extensions to `order-draft`, `submit`, `order-load`,
  `order-overlay`, `state-binding`, `inspector-planet`,
  `inspector-overlay`, `game-shell-sidebar`, `game-shell-header`.
- `tests/e2e/cargo-routes.spec.ts` — Playwright happy path: add
  COL, add CAP, remove COL, asserting both the inspector and the
  arrow count via `__galaxyDebug.getMapPrimitives()`.

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

ui/frontend/src/sync/order-load.ts

@@ -14,11 +14,18 @@ import {
 	CommandPayload,
 	CommandPlanetProduce,
 	CommandPlanetRename,
+	CommandPlanetRouteRemove,
+	CommandPlanetRouteSet,
 	PlanetProduction,
+	PlanetRouteLoadType,
 	UserGamesOrderGet,
 	UserGamesOrderGetResponse,
 } from "../proto/galaxy/fbs/order";
-import type { OrderCommand, ProductionType } from "./order-types";
+import type {
+	CargoLoadType,
+	OrderCommand,
+	ProductionType,
+} from "./order-types";
 
 const MESSAGE_TYPE = "user.games.order.get";
 
@@ -155,6 +162,41 @@ function decodeCommand(item: CommandItemView): OrderCommand | null {
 				subject: inner.subject() ?? "",
 			};
 		}
+		case CommandPayload.CommandPlanetRouteSet: {
+			const inner = new CommandPlanetRouteSet();
+			item.payload(inner);
+			const loadType = cargoLoadTypeFromFBS(inner.loadType());
+			if (loadType === null) {
+				console.warn(
+					`fetchOrder: skipping CommandPlanetRouteSet with unknown load_type enum (${inner.loadType()})`,
+				);
+				return null;
+			}
+			return {
+				kind: "setCargoRoute",
+				id,
+				sourcePlanetNumber: Number(inner.origin()),
+				destinationPlanetNumber: Number(inner.destination()),
+				loadType,
+			};
+		}
+		case CommandPayload.CommandPlanetRouteRemove: {
+			const inner = new CommandPlanetRouteRemove();
+			item.payload(inner);
+			const loadType = cargoLoadTypeFromFBS(inner.loadType());
+			if (loadType === null) {
+				console.warn(
+					`fetchOrder: skipping CommandPlanetRouteRemove with unknown load_type enum (${inner.loadType()})`,
+				);
+				return null;
+			}
+			return {
+				kind: "removeCargoRoute",
+				id,
+				sourcePlanetNumber: Number(inner.origin()),
+				loadType,
+			};
+		}
 		default:
 			console.warn(
 				`fetchOrder: skipping unknown command kind (payloadType=${payloadType})`,
@@ -196,6 +238,31 @@ export function productionTypeFromFBS(
 	}
 }
 
+/**
+ * cargoLoadTypeFromFBS reverses `cargoLoadTypeToFBS` from
+ * `submit.ts`. `PlanetRouteLoadType.UNKNOWN` and any out-of-band
+ * value yield `null` so the caller drops the entry rather than
+ * fabricating a synthetic load type.
+ */
+export function cargoLoadTypeFromFBS(
+	value: PlanetRouteLoadType,
+): CargoLoadType | null {
+	switch (value) {
+		case PlanetRouteLoadType.COL:
+			return "COL";
+		case PlanetRouteLoadType.CAP:
+			return "CAP";
+		case PlanetRouteLoadType.MAT:
+			return "MAT";
+		case PlanetRouteLoadType.EMP:
+			return "EMP";
+		case PlanetRouteLoadType.UNKNOWN:
+			return null;
+		default:
+			return null;
+	}
+}
+
 function decodeError(
 	payload: Uint8Array,
 	resultCode: string,