diff --git a/.golangci.yml b/.golangci.yml
index a78482c..68516b8 100644
--- a/.golangci.yml
+++ b/.golangci.yml
@@ -28,7 +28,7 @@ linters:
     - usestdlibvars
     - usetesting
     - whitespace
-    - wsl
+    - wsl_v5
 formatters:
   enable:
     - gci
diff --git a/backend/events/cmd/genevents/main.go b/backend/events/cmd/genevents/main.go
index 7bea094..d83467a 100644
--- a/backend/events/cmd/genevents/main.go
+++ b/backend/events/cmd/genevents/main.go
@@ -20,6 +20,7 @@ import (
 func main() {
 	source := flag.String("source", "events.go", "path to Go events source file")
 	output := flag.String("output", "", "path to TypeScript output file (stdout if empty)")
+
 	flag.Parse()
 
 	consts, err := parseEvents(*source)
diff --git a/backend/fileutil/atomicwrite_test.go b/backend/fileutil/atomicwrite_test.go
index 2196f5b..2571263 100644
--- a/backend/fileutil/atomicwrite_test.go
+++ b/backend/fileutil/atomicwrite_test.go
@@ -261,6 +261,7 @@ func TestAtomicWrite_SyncAndClose(t *testing.T) {
 
 	// Write 1 MiB of data.
 	const size = 1 << 20 //nolint:mnd
+
 	data := bytes.Repeat([]byte("x"), size)
 
 	err := AtomicWrite(slog.Default(), target, func(tmp *os.File) error {
diff --git a/backend/library/library.go b/backend/library/library.go
index 74f8ce5..ca85bd5 100644
--- a/backend/library/library.go
+++ b/backend/library/library.go
@@ -420,7 +420,6 @@ func (l *Library) scanInternal(
 				return nil
 			},
 		)
-
 		if walkErr != nil {
 			metrics.addWarning(
 				"", "walk",
diff --git a/backend/player/buffered_streamer_test.go b/backend/player/buffered_streamer_test.go
index 2eb4074..3d90528 100644
--- a/backend/player/buffered_streamer_test.go
+++ b/backend/player/buffered_streamer_test.go
@@ -54,6 +54,7 @@ func finiteStreamer(n int) beep.Streamer {
 
 func TestBufferedStreamer_BasicStream(t *testing.T) {
 	const total = 1000
+
 	src := finiteStreamer(total)
 	bs := NewBufferedStreamer(src, 2048)
 
@@ -120,6 +121,7 @@ func TestBufferedStreamer_BasicStream(t *testing.T) {
 
 func TestBufferedStreamer_SmallReads(t *testing.T) {
 	const total = 200
+
 	src := finiteStreamer(total)
 	bs := NewBufferedStreamer(src, 512)
 
@@ -185,6 +187,7 @@ func TestBufferedStreamer_SmallReads(t *testing.T) {
 
 func TestBufferedStreamer_SourceDrained(t *testing.T) {
 	const total = 100
+
 	src := finiteStreamer(total)
 	bs := NewBufferedStreamer(src, 256)
 
diff --git a/backend/player/player.go b/backend/player/player.go
index 696a2e5..31426c9 100644
--- a/backend/player/player.go
+++ b/backend/player/player.go
@@ -802,7 +802,6 @@ func (p *Player) seekLocked(targetSeconds int) error {
 
 		return p.seeker.Seek(samples)
 	}()
-
 	if seekErr != nil {
 		speaker.Unlock()
 
diff --git a/backend/tagwriter/dbsync.go b/backend/tagwriter/dbsync.go
index 013a124..b240d75 100644
--- a/backend/tagwriter/dbsync.go
+++ b/backend/tagwriter/dbsync.go
@@ -514,6 +514,7 @@ func generateSizedVariants(logger *slog.Logger, imgData []byte, dir, hashStr str
 	src, _, err := image.Decode(bytes.NewReader(imgData))
 	if err != nil {
 		logger.Warn("could not decode image for thumbnails", "err", err)
+
 		return
 	}
 
@@ -537,6 +538,7 @@ func generateSizedVariants(logger *slog.Logger, imgData []byte, dir, hashStr str
 		var buf bytes.Buffer
 		if encErr := jpeg.Encode(&buf, dst, &jpeg.Options{Quality: tier.quality}); encErr != nil {
 			logger.Warn("could not encode thumbnail", "tier", tier.suffix, "err", encErr)
+
 			continue
 		}
 
diff --git a/backend/tagwriter/mp3_test.go b/backend/tagwriter/mp3_test.go
index 29ccd91..1817ccb 100644
--- a/backend/tagwriter/mp3_test.go
+++ b/backend/tagwriter/mp3_test.go
@@ -227,10 +227,10 @@ func TestWriteMp3Tags_AtomicSafety(t *testing.T) {
 	// Attempt to write to a non-existent directory to force AtomicWrite
 	// to fail (the temp file creation will fail).
 	badPath := filepath.Join(dir, "nonexistent", "subdir", "file.mp3")
+
 	writeErr := writeMp3Tags(testLogger(), badPath, TagChanges{
 		FieldTitle: "After",
 	})
-
 	if writeErr == nil {
 		t.Fatal("expected error for non-existent path, got nil")
 	}
diff --git a/backend/tagwriter/ogg.go b/backend/tagwriter/ogg.go
index 2d57571..92cf02e 100644
--- a/backend/tagwriter/ogg.go
+++ b/backend/tagwriter/ogg.go
@@ -14,14 +14,14 @@ import (
 
 // Sentinel errors for OGG operations.
 var (
-	errNotOgg          = errors.New("not an OGG file")
-	errNotVorbis       = errors.New("not an OGG Vorbis file")
-	errOggMultiStream  = errors.New("this OGG file contains multiple streams and cannot be edited")
-	errOggTruncated    = errors.New("OGG file is truncated")
-	errOggInvalidPage  = errors.New("invalid OGG page")
-	errOggBadVersion   = errors.New("unsupported OGG version")
-	errOggNoPages      = errors.New("OGG file contains no pages")
-	errOggMissingSetup = errors.New("OGG file is missing the setup header packet")
+	errNotOgg           = errors.New("not an OGG file")
+	errNotVorbis        = errors.New("not an OGG Vorbis file")
+	errOggMultiStream   = errors.New("this OGG file contains multiple streams and cannot be edited")
+	errOggTruncated     = errors.New("OGG file is truncated")
+	errOggBadVersion    = errors.New("unsupported OGG version")
+	errOggTooFewPackets = errors.New("ogg vorbis: expected at least 3 header packets")
+	errOggNoPages       = errors.New("OGG file contains no pages")
+	errOggMissingSetup  = errors.New("OGG file is missing the setup header packet")
 )
 
 // oggCRCTable is the pre-computed 256-entry CRC32 lookup table for OGG.
@@ -117,7 +117,11 @@ func parseOggPages(logger *slog.Logger, filePath string) ([]oggPage, error) {
 		segEnd := segStart + numSegments
 
 		if segEnd > len(raw) {
-			return nil, fmt.Errorf("%w: segment table truncated at offset %d", errOggTruncated, offset)
+			return nil, fmt.Errorf(
+				"%w: segment table truncated at offset %d",
+				errOggTruncated,
+				offset,
+			)
 		}
 
 		segmentTable := make([]byte, numSegments)
@@ -192,7 +196,8 @@ func parseOggPages(logger *slog.Logger, filePath string) ([]oggPage, error) {
 
 	// Validate: first page is Vorbis identification header.
 	firstPacketData := pages[0].data
-	if len(firstPacketData) < 7 || firstPacketData[0] != 0x01 || //nolint:mnd // Vorbis ID header magic
+	if len(firstPacketData) < 7 ||
+		firstPacketData[0] != 0x01 || //nolint:mnd // Vorbis ID header magic
 		string(firstPacketData[1:7]) != "vorbis" {
 		return nil, errNotVorbis
 	}
@@ -249,6 +254,7 @@ func writeOggPage(w io.Writer, page oggPage) error {
 // a value <255 terminates it.
 func extractPackets(pages []oggPage) [][]byte {
 	var packets [][]byte
+
 	var current []byte
 
 	for _, page := range pages {
@@ -299,7 +305,12 @@ func splitPacketIntoSegments(packet []byte) []byte {
 // respecting the 255-segment-per-page limit.  The first page gets the
 // headerType as-is; continuation pages get the continued flag (0x01)
 // ORed in.  All pages share the same serialNo and granulePos.
-func buildPagesFromSegments(segments []byte, packetData []byte, serialNo uint32, granulePos int64) []oggPage {
+func buildPagesFromSegments(
+	segments []byte,
+	packetData []byte,
+	serialNo uint32,
+	granulePos int64,
+) []oggPage {
 	const maxSegmentsPerPage = 255
 
 	var pages []oggPage
@@ -400,7 +411,7 @@ func writeOggTags(logger *slog.Logger, filePath string, changes TagChanges) erro
 	const minHeaderPackets = 3
 
 	if len(packets) < minHeaderPackets {
-		return fmt.Errorf("ogg vorbis: expected at least 3 header packets, got %d", len(packets))
+		return fmt.Errorf("%w: got %d", errOggTooFewPackets, len(packets))
 	}
 
 	_ = packets[0] // identification packet — preserved as page 0 unchanged
@@ -503,72 +514,10 @@ func findAudioPageStart(pages []oggPage) int {
 	return len(pages)
 }
 
-// serializePacketsToPages is a helper that builds pages from multiple
-// packets concatenated into the same page stream.  This is used for
-// the comment + setup header packets which share pages per Vorbis spec.
-func serializePacketsToPages(packets [][]byte, serialNo uint32, granulePos int64) []oggPage {
-	var allSegs []byte
-	var allData []byte
-
-	for _, pkt := range packets {
-		segs := splitPacketIntoSegments(pkt)
-		allSegs = append(allSegs, segs...)
-		allData = append(allData, pkt...)
-	}
-
-	return buildPagesFromSegments(allSegs, allData, serialNo, granulePos)
-}
-
-// computePacketBoundaryInPages determines how many complete packets
-// exist starting from the beginning of a sequence of pages, using
-// lacing values.  It returns the number of complete packets and
-// whether the reading ended mid-packet (a continued packet).
-func computePacketBoundaryInPages(pages []oggPage) (completedPackets int, midPacket bool) {
-	inPacket := false
-
-	for _, page := range pages {
-		for _, lacing := range page.segmentTable {
-			if lacing > 0 {
-				inPacket = true
-			}
-
-			if lacing < 255 { //nolint:mnd // OGG lacing terminates packet
-				if inPacket || lacing == 0 {
-					completedPackets++
-					inPacket = false
-				}
-			}
-		}
-	}
-
-	return completedPackets, inPacket
-}
-
-// oggPagesCopy creates a deep copy of a slice of oggPage.
-func oggPagesCopy(pages []oggPage) []oggPage {
-	cp := make([]oggPage, len(pages))
-
-	for i, p := range pages {
-		cp[i] = oggPage{
-			headerType: p.headerType,
-			granulePos: p.granulePos,
-			serialNo:   p.serialNo,
-			seqNo:      p.seqNo,
-		}
-
-		cp[i].segmentTable = make([]byte, len(p.segmentTable))
-		copy(cp[i].segmentTable, p.segmentTable)
-
-		cp[i].data = make([]byte, len(p.data))
-		copy(cp[i].data, p.data)
-	}
-
-	return cp
-}
-
 // pageBytes serializes an OGG page to raw bytes (for CRC verification etc.).
 func pageBytes(page oggPage) []byte {
 	var buf bytes.Buffer
+
 	_ = writeOggPage(&buf, page)
 
 	return buf.Bytes()
diff --git a/backend/tagwriter/ogg_test.go b/backend/tagwriter/ogg_test.go
index 6990083..72309c5 100644
--- a/backend/tagwriter/ogg_test.go
+++ b/backend/tagwriter/ogg_test.go
@@ -5,6 +5,7 @@ import (
 	"encoding/binary"
 	"os"
 	"path/filepath"
+	"strings"
 	"testing"
 
 	"yellowjacket/backend/metadata"
@@ -601,6 +602,7 @@ func TestWriteOggTags_RejectMultiStream(t *testing.T) {
 	identSegs := splitPacketIntoSegments(identPacket)
 
 	const serial1 uint32 = 0x11111111
+
 	const serial2 uint32 = 0x22222222
 
 	page1 := oggPage{
@@ -652,8 +654,5 @@ func errorContains(err error, substr string) bool {
 		return false
 	}
 
-	return bytes.Contains(
-		[]byte(err.Error()),
-		[]byte(substr),
-	)
+	return strings.Contains(err.Error(), substr)
 }
diff --git a/backend/tagwriter/ogg_vorbis.go b/backend/tagwriter/ogg_vorbis.go
index eb27211..44d8d86 100644
--- a/backend/tagwriter/ogg_vorbis.go
+++ b/backend/tagwriter/ogg_vorbis.go
@@ -4,11 +4,18 @@ import (
 	"bytes"
 	"encoding/base64"
 	"encoding/binary"
+	"errors"
 	"fmt"
 	"strconv"
 	"strings"
 )
 
+// Sentinel errors for Vorbis Comment operations.
+var (
+	errVorbisPacketShort  = errors.New("vorbis comment packet too short")
+	errVorbisInvalidMagic = errors.New("invalid vorbis comment header magic")
+)
+
 // oggVorbisComment holds a parsed Vorbis Comment structure with raw
 // byte preservation for non-edited fields (even if they contain
 // invalid UTF-8).
@@ -24,11 +31,12 @@ func parseVorbisCommentPacket(packet []byte) (*oggVorbisComment, error) {
 	const prefixLen = 7 // \x03 + "vorbis"
 
 	if len(packet) < prefixLen {
-		return nil, fmt.Errorf("vorbis comment packet too short: %d bytes", len(packet))
+		return nil, fmt.Errorf("%w: %d bytes", errVorbisPacketShort, len(packet))
 	}
 
-	if packet[0] != 0x03 || string(packet[1:7]) != "vorbis" { //nolint:mnd // Vorbis comment header magic
-		return nil, fmt.Errorf("invalid vorbis comment header magic")
+	if packet[0] != 0x03 ||
+		string(packet[1:7]) != "vorbis" { //nolint:mnd // Vorbis comment header magic
+		return nil, errVorbisInvalidMagic
 	}
 
 	r := bytes.NewReader(packet[prefixLen:])
@@ -200,7 +208,13 @@ func buildMetadataBlockPicture(imageData []byte) []byte {
 
 	// Calculate size: type(4) + mimeLen(4) + mime + descLen(4) + desc
 	//   + width(4) + height(4) + depth(4) + colors(4) + dataLen(4) + data
-	size := 4 + 4 + len(mime) + 4 + len(desc) + 4*4 + 4 + len(imageData) //nolint:mnd // FLAC PICTURE block fields
+	size := 4 + 4 + len(
+		mime,
+	) + 4 + len(
+		desc,
+	) + 4*4 + 4 + len(
+		imageData,
+	) //nolint:mnd // FLAC PICTURE block fields
 
 	buf := make([]byte, 0, size)
 
diff --git a/backend/tagwriter/pipeline.go b/backend/tagwriter/pipeline.go
index b5a7185..6ccec26 100644
--- a/backend/tagwriter/pipeline.go
+++ b/backend/tagwriter/pipeline.go
@@ -244,11 +244,13 @@ func (tw *TagWriter) BatchWriteTrackTags(
 
 	// Set up cancellation channel.
 	tw.cancelBatch = make(chan struct{})
+
 	defer func() { tw.cancelBatch = nil }()
 
 	// Suppress per-track TrackMetadataChanged events — we emit one
 	// at the end instead.
 	tw.suppressEvents = true
+
 	defer func() { tw.suppressEvents = false }()
 
 	for i, filePath := range filePaths {
@@ -256,12 +258,11 @@ func (tw *TagWriter) BatchWriteTrackTags(
 		select {
 		case <-tw.cancelBatch:
 			result.Cancelled = true
+
 			tw.logger.Info("batch write cancelled",
 				"at", i,
 				"total", total,
 			)
-
-			break
 		default:
 		}
 
@@ -276,6 +277,7 @@ func (tw *TagWriter) BatchWriteTrackTags(
 				FilePath: filePath,
 				Error:    err.Error(),
 			})
+
 			tw.logger.Warn("batch track failed",
 				"path", filePath,
 				"err", err,
diff --git a/backend/tagwriter/tagwriter.go b/backend/tagwriter/tagwriter.go
index 2e08ce1..433adcf 100644
--- a/backend/tagwriter/tagwriter.go
+++ b/backend/tagwriter/tagwriter.go
@@ -99,6 +99,7 @@ func asBytes(v any) ([]byte, bool) {
 	}
 
 	out := make([]byte, len(arr))
+
 	for i, elem := range arr {
 		f, ok := elem.(float64)
 		if !ok {
diff --git a/backend/tagwriter/wav_test.go b/backend/tagwriter/wav_test.go
index 7c28ed6..3b54280 100644
--- a/backend/tagwriter/wav_test.go
+++ b/backend/tagwriter/wav_test.go
@@ -32,6 +32,7 @@ func createTestWAV(
 
 	// --- data chunk: 200 bytes of silence ---
 	const silenceLen = 200 //nolint:mnd
+
 	silence := make([]byte, silenceLen)
 
 	// --- optional id3 chunk ---
@@ -401,7 +402,6 @@ func TestWriteWavTags_AtomicSafety(t *testing.T) {
 	writeErr := writeWavTags(testLogger(), badPath, TagChanges{
 		FieldTitle: "After",
 	})
-
 	if writeErr == nil {
 		t.Fatal("expected error for non-existent path, got nil")
 	}
@@ -443,7 +443,6 @@ func TestWriteWavTags_RejectsRF64(t *testing.T) {
 	err := writeWavTags(testLogger(), path, TagChanges{
 		FieldTitle: "Should Fail",
 	})
-
 	if err == nil {
 		t.Fatal("expected error for RF64 file, got nil")
 	}
@@ -601,6 +600,7 @@ func createTestWAVWithExtraChunks(
 
 	// 200 bytes of silence for data chunk.
 	const silenceLen = 200 //nolint:mnd
+
 	silence := make([]byte, silenceLen)
 
 	// Calculate RIFF payload.