fix: refine lunar countdown ui semantics and mobile add

backend/mvp.py

@@ -351,12 +351,15 @@ class CountdownUpdate(BaseModel):
 def countdown_dict(row: Countdown, today: date | None = None):
     today = today or datetime.now(ZoneInfo("Asia/Shanghai")).date()
     if row.calendar_mode == "lunar" and (row.ignore_year or row.repeat_rule != "none"):
+        # 农历按年重复：忽略年份或指定重复时，都按“每年农历”语义计算下一次
         display_date = next_lunar_occurrence(
-            row.lunar_month, row.lunar_day, row.ignore_year, row.repeat_rule, today
+            row.lunar_month, row.lunar_day, True, "yearly", today
         ) or row.event_date
+        effective_repeat = "yearly"
     else:
         repeat_rule = "yearly" if row.ignore_year else row.repeat_rule
         display_date = countdown_occurrence(row.event_date, repeat_rule, today)
+        effective_repeat = repeat_rule
     days, day_text = countdown_status(display_date, today)
     lunar_year = None
     lunar_text = None
@@ -377,9 +380,9 @@ def countdown_dict(row: Countdown, today: date | None = None):
         "lunar_month": row.lunar_month,
         "lunar_day": row.lunar_day,
         "ignore_year": row.ignore_year,
+        "repeat_rule": effective_repeat,
         "lunar_text": lunar_text,
         "kind": row.kind,
-        "repeat_rule": row.repeat_rule,
         "icon": row.icon,
         "pinned": row.pinned,
         "archived_at": row.archived_at,