Optimize mover rendering and segment plan pipeline

tests/UnitMotionRenderQueue.test.ts

@@ -0,0 +1,53 @@
+import { describe, expect, it } from "vitest";
+import {
+  UnitMotionRenderQueue,
+  UnitMotionRenderQueueEntry,
+} from "../src/client/graphics/layers/UnitMotionRenderQueue";
+
+describe("UnitMotionRenderQueue", () => {
+  it("returns highest-priority entry first", () => {
+    const queue = new UnitMotionRenderQueue();
+    queue.enqueue({
+      unitId: 1,
+      version: 1,
+      priority: 10,
+      onScreenHint: false,
+    });
+    queue.enqueue({
+      unitId: 2,
+      version: 1,
+      priority: 20,
+      onScreenHint: true,
+    });
+
+    const first = queue.pollValid(() => true);
+    expect(first?.unitId).toBe(2);
+  });
+
+  it("skips stale entries when validator rejects old versions", () => {
+    const queue = new UnitMotionRenderQueue();
+    const latestVersion = new Map<number, number>([[42, 2]]);
+
+    const stale: UnitMotionRenderQueueEntry = {
+      unitId: 42,
+      version: 1,
+      priority: 100,
+      onScreenHint: true,
+    };
+    const fresh: UnitMotionRenderQueueEntry = {
+      unitId: 42,
+      version: 2,
+      priority: 50,
+      onScreenHint: true,
+    };
+
+    queue.enqueue(stale);
+    queue.enqueue(fresh);
+
+    const picked = queue.pollValid((entry) => {
+      return latestVersion.get(entry.unitId) === entry.version;
+    });
+
+    expect(picked).toEqual(fresh);
+  });
+});