Move to Go 1.27, and fix initials for non-ASCII names
Initials() capped the loop with len(out) == 2, which counts bytes: a name starting with Ä, Ö or Å filled the budget on its own and returned a single letter. Count the initials taken instead. go fix also wanted a strings.Builder here, but that allocates a string per iteration to measure a two-character result. Took its SplitSeq suggestion in lyrics.go, which drops an intermediate slice.
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