feat(downloads): live speeds and active/completed split on the download panel (DL-2)

- GET /download-tasks/board?state=active|completed: per-torrent dl/up speed,
  ETA, seeds/leechs, downloader total speed (transfer/info), counts for both
  groups, latest organize result (status, reason code, open decision)
- live qB data cached per instance for 2 s with in-flight coalescing
- panel: total speed line, 进行中 / 已完成 segments remembered locally,
  4 s polling while the page is visible, mobile layout, "—" for zero speed

Co-Authored-By: Claude Opus 5.5 <[email protected]>

packages/testkit/src/qbittorrent/mock-qb.ts

@@ -31,6 +31,10 @@ export interface MockQbTorrent {
   dlspeed: number;
   upspeed: number;
   eta: number;
+  num_seeds: number;
+  num_leechs: number;
+  num_complete: number;
+  num_incomplete: number;
   ratio: number;
   seeding_time: number;
   infohash_v1: string;
@@ -171,6 +175,10 @@ export async function createMockQb(opts: MockQbOptions = {}): Promise<MockQb> {
       dlspeed: 0,
       upspeed: 0,
       eta: 8640000,
+      num_seeds: 0,
+      num_leechs: 0,
+      num_complete: -1,
+      num_incomplete: -1,
       ratio: 0,
       seeding_time: 0,
       infohash_v1: t.hash,
@@ -500,7 +508,12 @@ export async function createMockQb(opts: MockQbOptions = {}): Promise<MockQb> {
     }),
     "app/setPreferences": () => ({ status: 500, body: "mock: writing global preferences is not allowed" }),
     "transfer/info": () => ({
-      body: JSON.stringify({ dl_info_speed: 0, up_info_speed: 0, connection_status: "connected" }),
+      // 与真实 qB 一致:全局速度是所有任务速度之和(不只是某个标签)
+      body: JSON.stringify({
+        dl_info_speed: [...torrents.values()].reduce((a, t) => a + t.dlspeed, 0),
+        up_info_speed: [...torrents.values()].reduce((a, t) => a + t.upspeed, 0),
+        connection_status: "connected",
+      }),
       json: true,
     }),
     "torrents/tags": () => ({ body: JSON.stringify([...tagDefs]), json: true }),