fix: 优化在线歌词选择逻辑

Author: imsyy

src/services/lyric/loader.spec.ts

@@ -483,4 +483,30 @@ describe("lyric loader", () => {
     expect(media.activeLyric?.platform).toBe("netease");
     expect(media.parsedLyric[0].words[0].word).toContain("网易云普通LRC歌词");
   });
+
+  it("跟随自身：当前展示他站高优先级时，切换为跟随自身必须替换为自身平台歌词", async () => {
+    const settings = useSettingsStore();
+    const media = useMediaStore();
+    const track = createTrack("song_self_switch");
+    media.track = track;
+
+    mockResolveOnlineByPreference.mockResolvedValue({
+      source: { source: "online", format: "qrc", platform: "qqmusic" },
+      input: { content: "[1000,1000]他站优质QRC(1000,1000)" },
+    });
+    await loadForTrack(null);
+    expect(media.activeLyric?.format).toBe("qrc");
+
+    mockResolveOnlineByPreference.mockResolvedValue({
+      source: { source: "online", format: "lrc", platform: "netease" },
+      input: { content: "[00:01.00]自身平台普通LRC歌词" },
+    });
+    settings.lyric.lyricSourcePreference = "self";
+
+    await vi.waitFor(() => {
+      expect(media.activeLyric?.format).toBe("lrc");
+    });
+    expect(media.activeLyric?.platform).toBe("netease");
+    expect(media.parsedLyric[0].words[0].word).toContain("自身平台普通LRC歌词");
+  });
 });

src/services/lyric/loader.ts

@@ -197,8 +197,9 @@ const applyOnline = (
   }
   // 尝试提交在线歌词
   const preference = useSettingsStore().lyric.lyricSourcePreference;
-  const isExplicit = preference !== "auto" && preference !== "self";
-  // 非显式指定模式（智能选择）下，若当前已展示更优歌词（如候选抢占或插件优选），不降级覆盖
+  // 仅自动模式是智能选择，其余（含跟随自身）均为用户显式指令，来源权威高于格式优劣
+  const isExplicit = preference !== "auto";
+  // 自动模式下，若当前已展示更优歌词（如候选抢占或插件优选），不降级覆盖
   if (!isExplicit && current && !isBetterFormat(online.source.format, current.format)) {
     return;
   }