feat(ui): M6.38批 — P1 MD3细化(SDK对话框28)+批②底部上滑回桌面+批6 ncm顶栏回播放页+批④面板后台列表+launcher UI微调(歌词页黑半透明底/播放页布局下移)+封面空artwork保留修复

- P1: meow_ui_dialog.c 对话框底框 radius_card→MEOW_SHAPE_EXTRA_LARGE(28) 三处(:103填充/:104描边/:361 BottomSheet); meow_ui_widgets.h 新增 MEOW_SHAPE_EXTRA_LARGE 28 宏; TextField/FAB/Slider/Progress 按设计文档保留
- 批②: np_gesture.h 新增 NP_GEST_HOME+np_home_gesture(底部热区上滑,与左缘返回对称互斥); now_playing.c 新增 np_draw_home_bar(屏底左缘pill指示条)+手势衔接; test_now_playing_widgets G5b
- 批6: ncm home.c 顶栏加回播放页按钮(MEOW_ICON_QUEUE_MUSIC)→push(ACT_PLAYER), 无音频也生效
- 批④: meowpanel /api/ams/bg 只读端点+前端后台列表页+杀/清复用kill通道
- UI微调: now_playing.c 播放页布局宏下移(NP_COVER_Y 84/NP_BTN_Y 612消底部留白)+歌词页背景统一黑色半透明叠层(弃封面取色底,删 np_draw_lyric_coverbg)
- 封面保留: now_playing.c/notif_center.c 空artwork保留上一张已解码封面(防暂停/开歌单致META报空artwork后封面闪没); test_np_cover C2断言更新+mirror同步

0warning;宿主测试 test_np_cover ALL PASS;launcher/ncm/panel 宿主测试无回归。二进制留批量批次未入库

patch_v2/meow_launcherd/test_now_playing_widgets.c

@@ -308,6 +308,50 @@ int main(void)
     CHECK(np_gesture_decide(NP_PAGE_PLAY, 200, 300, 5, 80) == NP_GEST_NONE,
           "vertical dominant -> NONE");
 
+    /* ============ G5b 批② 底部上滑（home）手势（np_gesture.h np_home_gesture，纯逻辑） ============ */
+    printf("G5b bottom-swipe-up home gesture\n");
+    const int FBRES = 720;   /* 屏高（宿主 480x720；真机 fb_yres=720） */
+    const int BZ = FBRES - NP_HOME_EDGE_H;   /* 底部起滑区上界 692 */
+    /* 底部起滑 + 向上主导 ≥阈值 → HOME */
+    CHECK(np_home_gesture(200, BZ + 10, 0, -120, FBRES) == 1,
+          "home: bottom zone + up-swipe -> HOME");
+    CHECK(np_home_gesture(100, FBRES - 1, 20, -80, FBRES) == 1,
+          "home: very bottom + slight right-drift up -> HOME");
+    /* 与左缘返回互斥：左缘起点（down_x<NP_EDGE_W）不认 home（让给左缘返回） */
+    CHECK(np_home_gesture(10, BZ + 10, 0, -120, FBRES) == 0,
+          "home: left-edge origin -> NOT home (reserved for edge-back)");
+    /* 起点不在底部起滑区（顶部/中部）不认 home */
+    CHECK(np_home_gesture(200, 10, 0, -120, FBRES) == 0,
+          "home: top origin -> NOT home");
+    CHECK(np_home_gesture(200, 300, 0, -120, FBRES) == 0,
+          "home: mid origin -> NOT home");
+    /* 横向主导（向右滑）不认 home（该判给左缘返回/切页） */
+    CHECK(np_home_gesture(200, BZ + 10, 120, 0, FBRES) == 0,
+          "home: right-dominant -> NOT home");
+    /* 向下滑 / 未达阈值 / 竖向不主导 不认 home */
+    CHECK(np_home_gesture(200, BZ + 10, 0, 120, FBRES) == 0,
+          "home: downward -> NOT home");
+    CHECK(np_home_gesture(200, BZ + 10, 0, -NP_HOME_SWIPE + 1, FBRES) == 0,
+          "home: below up-threshold -> NOT home");
+    CHECK(np_home_gesture(200, BZ + 10, -120, -80, FBRES) == 0,
+          "home: horizontal-dominant up -> NOT home");
+    /* 与 now_playing.c 集成顺序一致：np_gesture_decide 对底部纵滑返回 NONE，再由 home 覆盖为 HOME */
+    {
+        int dx = 0, dy = -120, tdx = 200, tdy = BZ + 10;
+        np_gest_t gnp = np_gesture_decide(NP_PAGE_PLAY, tdx, tdy, dx, dy);
+        if (np_home_gesture(tdx, tdy, dx, dy, FBRES)) gnp = NP_GEST_HOME;
+        CHECK(gnp == NP_GEST_HOME,
+              "integration: bottom up-swipe -> HOME (overrides decide-NONE)");
+    }
+    /* 集成：左缘起点底部上滑不被误判为 home（保留给左缘返回） */
+    {
+        int tdx = 8, tdy = BZ + 10, dx = 0, dy = -120;   /* 左缘 + 上滑（竖向主导） */
+        np_gest_t gnp = np_gesture_decide(NP_PAGE_PLAY, tdx, tdy, dx, dy);
+        if (np_home_gesture(tdx, tdy, dx, dy, FBRES)) gnp = NP_GEST_HOME;
+        CHECK(gnp != NP_GEST_HOME,
+              "integration: left-edge origin up-swipe -> NOT home");
+    }
+
     /* ============ G6 歌词页：空态 + 渲染（批2 控件 + 批3 数据语义） ============ */
     printf("G6 lyric view: empty + render\n");
     meow_ui_activity_push(NP_SENTINEL);