From 8f4c4a0c2b14eeeaeccb972a40addb11f3d65437 Mon Sep 17 00:00:00 2001
From: Caleb Allen <caleballen1276@gmail.com>
Date: Thu, 19 Mar 2026 08:42:53 -0400
Subject: [PATCH] fix(19-01): add album_artist TPE2 mapping to applyTextChanges
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- Map FieldAlbumArtist to TPE2 frame via CommonID
- Follows same pattern as FieldComposer → TCOM
- Fixes latent gap in MP3 writing, enables WAV reuse
---
 backend/tagwriter/mp3.go | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/backend/tagwriter/mp3.go b/backend/tagwriter/mp3.go
index 8225047..b654a7d 100644
--- a/backend/tagwriter/mp3.go
+++ b/backend/tagwriter/mp3.go
@@ -82,6 +82,12 @@ func applyTextChanges(tag *id3v2.Tag, changes TagChanges) {
 		tag.DeleteFrames("TCOM")
 		tag.AddTextFrame("TCOM", id3v2.EncodingUTF8, v)
 	}
+
+	if v, ok := changes[FieldAlbumArtist].(string); ok {
+		tpe2ID := tag.CommonID("Band/Orchestra/Accompaniment")
+		tag.DeleteFrames(tpe2ID)
+		tag.AddTextFrame(tpe2ID, id3v2.EncodingUTF8, v)
+	}
 }
 
 // applyCoverArtChanges handles the FieldCoverArt entry in the diff map.