feat(panel): homepage shows computed next-fire time

launchd exposes no next-trigger (systemd-only), so the 栏目列表 下次 column
was always '-' on macOS — compute it from schedule times (same _next_fire
as the schedule board) and highlight it amber.

web/app.py

@@ -577,6 +577,15 @@ def index():
             })
     # 开启(开关 ON)的栏目置顶,组内保持字母序
     sources.sort(key=lambda s: (0 if s.get("toggle_on") else 1, s["source"]))
+
+    # macOS launchd 不提供下次触发时间:从排期时间计算(与调度中心一致)
+    now = datetime.now()
+    for s in sources:
+        if s.get("next") in (None, "", "-"):
+            times = [t for t in pl.schedule_times(s["source"]).split(",") if t.strip()]
+            nxt = _next_fire(times, now)
+            if nxt:
+                s["next"] = nxt.strftime("%m-%d %H:%M")
     # digest timer 状态
     digest_props = get_systemd_props("news-harvester-digest.timer")
     digest_run_time = (read_oncalendar_from_systemd("news-harvester-digest.timer")

web/templates/index.html

@@ -93,7 +93,7 @@
       </td>
       <td>
         <span style="color:#666;font-size:12px">上次</span> {{ s.last }}<br>
-        <span style="color:#666;font-size:12px">下次</span> {{ s.next }}
+        <span style="color:#666;font-size:12px">下次</span> <span style="color:#e8c34a;font-weight:600">{{ s.next }}</span>
       </td>
       <td>
         {% if s.log %}