Don't parse word time tags if multiple line times are present

Word time tags are absolute timestamps in the lyrics, so having multiple line times would generally conflict with them. Thus, they should be just ignored instead, since the format is wrong.
The same applies if there is no line time tag, in that case, it wouldn't be known when the first word starts.
Both are inconsidered incorrect LRC and thus only parsed on a best-effort basis.

Author: Maxr1998

LrcParser.Tests/Parser/Lrc/Lines/LrcLyricParserTest.cs

@@ -105,6 +105,17 @@ public void TestDecode(string lyric, LrcLyric expected)
                 TimeTags = [],
             },
         ],
+        // Don't parse word time tags if multiple line time tags are found, as this is unsupported by LRC.
+        // Instead, return the unparsed line without the line time and no word time tags.
+        [
+            "[00:17.00][00:18.00] <00:00.00>帰<00:01.00>り<00:02.00>道<00:03.00>は",
+            new LrcLyric
+            {
+                Text = "<00:00.00>帰<00:01.00>り<00:02.00>道<00:03.00>は",
+                StartTimes = [17000, 18000],
+                TimeTags = [],
+            },
+        ],
     };
 
     [TestCaseSource(nameof(testEncodeSource))]

LrcParser/Parser/Lrc/Lines/LrcLyricParser.cs

@@ -1,6 +1,7 @@
 // Copyright (c) karaoke.dev <contact@karaoke.dev>. Licensed under the MIT Licence.
 // See the LICENCE file in the repository root for full licence text.
 
+using LrcParser.Model;
 using LrcParser.Parser.Lines;
 using LrcParser.Parser.Lrc.Metadata;
 using LrcParser.Parser.Lrc.Utils;
@@ -14,8 +15,20 @@ public override bool CanDecode(string text)
 
     public override LrcLyric Decode(string text)
     {
-        var (startTimes, lyricText) = LrcStartTimeUtils.SplitLyricAndTimeTag(text);
-        var (lyric, timeTags) = LrcTimedTextUtils.TimedTextToObject(lyricText);
+        var (startTimes, rawLyric) = LrcStartTimeUtils.SplitLyricAndTimeTag(text);
+
+        // Word time tags can't be used if there are no or more than one line time tags
+        if (startTimes.Length is 0 or > 1)
+        {
+            return new LrcLyric
+            {
+                Text = rawLyric,
+                StartTimes = startTimes,
+                TimeTags = new SortedDictionary<TextIndex, int>()
+            };
+        }
+
+        var (lyric, timeTags) = LrcTimedTextUtils.TimedTextToObject(rawLyric);
 
         return new LrcLyric
         {