Widget v2 glassmorphism + lyrics + backup system

- Widget data layer: waveform sampling, CIAreaAverage color extraction,
  secondary color computation, crossfade countdown from DJ profiles
- Widget views full rewrite: glass panel, 40-bar waveform Canvas with
  SeekToIntent tap zones, color-adaptive theming, transport controls
- Small: inset glass. Medium/Large: flush edge-to-edge (no red border)
- Medium: art + info + waveform + controls + Up Next footer
- Large: art + info + waveform + controls + 3-item queue + crossfade footer
- Live lyrics: karaoke word-by-word gradient fill, LRCLIB search/fetch,
  timing editor with tap-to-sync, embed via Companion API
- Backup system: .nvdbackup export/import via ZIPFoundation, UTI for AirDrop
- Smart DJ bulk prefetch: single gzipped request on app launch
- clearAll() now covers all 17 widget keys including seekToTime

Widget/NowPlayingWidgetViews.swift

@@ -109,24 +109,28 @@ struct NowPlayingWidgetView: View {
 
 struct GlassPanel<Content: View>: View {
     let colors: WidgetColors
+    var flush: Bool = false
     @ViewBuilder var content: () -> Content
 
     var body: some View {
+        let radius: CGFloat = flush ? 0 : 16
+        let outerPad: CGFloat = flush ? 0 : 8
+
         content()
-            .padding(12)
+            .padding(flush ? 14 : 12)
             .background(
-                RoundedRectangle(cornerRadius: 16, style: .continuous)
+                RoundedRectangle(cornerRadius: radius, style: .continuous)
                     .fill(.ultraThinMaterial)
                     .overlay(
-                        RoundedRectangle(cornerRadius: 16, style: .continuous)
+                        RoundedRectangle(cornerRadius: radius, style: .continuous)
                             .fill(colors.accent.opacity(0.06))
                     )
                     .overlay(
-                        RoundedRectangle(cornerRadius: 16, style: .continuous)
-                            .stroke(.white.opacity(0.12), lineWidth: 0.5)
+                        RoundedRectangle(cornerRadius: radius, style: .continuous)
+                            .stroke(.white.opacity(0.12), lineWidth: flush ? 0 : 0.5)
                     )
             )
-            .padding(8)
+            .padding(outerPad)
     }
 }
 
@@ -334,7 +338,7 @@ struct MediumContent: View {
     let colors: WidgetColors
 
     var body: some View {
-        GlassPanel(colors: colors) {
+        GlassPanel(colors: colors, flush: true) {
             VStack(spacing: 6) {
                 // Top row: art + song info
                 HStack(spacing: 14) {
@@ -444,7 +448,7 @@ struct LargeContent: View {
     let colors: WidgetColors
 
     var body: some View {
-        GlassPanel(colors: colors) {
+        GlassPanel(colors: colors, flush: true) {
             VStack(spacing: 8) {
                 // Header: art + info + waveform
                 HStack(spacing: 16) {