fix(birth-sky): print the city for stored 「中国 · 省 · 市」 labels (BUG-1082)

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01N4f2nya58RoRu4yEmJgRGE

frontend/src/lib/birth-sky/caption.ts

@@ -26,6 +26,7 @@ const HAN = /[㐀-鿿]/;
 /**
  * City from a stored birth place label. Rules, most specific first:
  *
+ * 0. A leading 「中国」 segment (how stored labels start) is dropped first.
  * 1. Municipalities and SARs (`北京市 · 朝阳区`, `香港特别行政区`) → `北京`, `香港`.
  * 2. Chinese labels `省 · 市 · 区` → the second segment when it ends in 「市」,
  *    without the 「市」 (`河北省 · 邯郸市 · 峰峰矿区` → `邯郸`). Prefectures that are
@@ -36,7 +37,9 @@ const HAN = /[㐀-鿿]/;
  */
 export function birthSkyCity(label: string | null | undefined): string | null {
   if (typeof label !== "string") return null;
-  const segments = label.split(SEPARATOR).map((segment) => segment.trim()).filter(Boolean);
+  const all = label.split(SEPARATOR).map((segment) => segment.trim()).filter(Boolean);
+  // Stored China labels lead with 「中国 · 」 (geoapify-location-service); the rules below start at the province (BUG-1082).
+  const segments = all[0] === "中国" ? all.slice(1) : all;
   if (segments.length === 0) return null;
   const [first, second, third] = segments;
   if (CITY_PROVINCES[first]) return CITY_PROVINCES[first];

frontend/tests/birth-sky-caption.test.ts

@@ -12,6 +12,17 @@ test("China 省 · 市 · 区 labels give the prefecture city without 「市」"
   assert.equal(birthSkyCity("广西壮族自治区 · 桂林市 · 秀峰区"), "桂林");
 });
 
+// BUG-1082: stored labels are built as 「中国 · 省 · 市 · 区」 (geoapify-location-service.ts);
+// the fixtures above lacked the prefix, so real Chinese birthplaces printed no city.
+test("stored China labels lead with 「中国 · 」 and still give the city", () => {
+  assert.equal(birthSkyCity("中国 · 河北省 · 邯郸市 · 峰峰矿区"), "邯郸");
+  assert.equal(birthSkyCity("中国 · 浙江省 · 杭州市"), "杭州");
+  assert.equal(birthSkyCity("中国 · 北京市 · 北京市 · 朝阳区"), "北京");
+  assert.equal(birthSkyCity("中国 · 浙江省"), null);
+  assert.equal(birthSkyCity("中国"), null);
+  assert.equal(birthSkyCaption({ date: "1994-05-18", time: "07:40", placeLabel: "中国 · 浙江省 · 杭州市 · 西湖区" }), "1994年5月18日 07:40 · 杭州");
+});
+
 test("municipalities and SARs use their own name", () => {
   assert.equal(birthSkyCity("北京市 · 朝阳区"), "北京");
   assert.equal(birthSkyCity("上海市"), "上海");