feat(tokens): add design tokens, type scale, push scaffold, and root nav state

lib/tema/pluriwave_tokens.dart

@@ -11,6 +11,9 @@ class PluriWaveTokens extends ThemeExtension<PluriWaveTokens> {
     required this.glassSurface,
     required this.glassBorder,
     required this.glowColor,
+    required this.listSurface,
+    required this.liveGreen,
+    required this.offlineAccent,
     required this.radiusSm,
     required this.radiusMd,
     required this.radiusLg,
@@ -27,6 +30,21 @@ class PluriWaveTokens extends ThemeExtension<PluriWaveTokens> {
   final Color glassBorder;
   final Color glowColor;
 
+  /// Redesign additions (Design ADR-1). Row/card surface for the flat lists
+  /// introduced by the redesign (Favoritos, Buscar results). De-literalised
+  /// from `pluriwave_theme.dart`'s previous `surfaceContainerLow` literal —
+  /// same value, now named — so rendered output stays byte-identical.
+  final Color listSurface;
+
+  /// "EN DIRECTO" indicator and the Escuchar hero's waveform colour.
+  /// De-literalised from `pluriwave_theme.dart`'s previous `secondary`
+  /// literal — same value, now named.
+  final Color liveGreen;
+
+  /// Offline/reconnect banner accent (WU16). No prior literal to promote —
+  /// a genuinely new colour.
+  final Color offlineAccent;
+
   final double radiusSm;
   final double radiusMd;
   final double radiusLg;
@@ -53,6 +71,9 @@ class PluriWaveTokens extends ThemeExtension<PluriWaveTokens> {
     glassSurface: Color(0x1FFFFFFF),
     glassBorder: Color(0x33FFFFFF),
     glowColor: Color(0x6621D4D9),
+    listSurface: Color(0xFF102532),
+    liveGreen: Color(0xFF7EE4C2),
+    offlineAccent: Color(0xFF94A3B8),
     radiusSm: 14,
     radiusMd: 22,
     radiusLg: 30,
@@ -70,6 +91,9 @@ class PluriWaveTokens extends ThemeExtension<PluriWaveTokens> {
     Color? glassSurface,
     Color? glassBorder,
     Color? glowColor,
+    Color? listSurface,
+    Color? liveGreen,
+    Color? offlineAccent,
     double? radiusSm,
     double? radiusMd,
     double? radiusLg,
@@ -85,6 +109,9 @@ class PluriWaveTokens extends ThemeExtension<PluriWaveTokens> {
       glassSurface: glassSurface ?? this.glassSurface,
       glassBorder: glassBorder ?? this.glassBorder,
       glowColor: glowColor ?? this.glowColor,
+      listSurface: listSurface ?? this.listSurface,
+      liveGreen: liveGreen ?? this.liveGreen,
+      offlineAccent: offlineAccent ?? this.offlineAccent,
       radiusSm: radiusSm ?? this.radiusSm,
       radiusMd: radiusMd ?? this.radiusMd,
       radiusLg: radiusLg ?? this.radiusLg,
@@ -111,6 +138,10 @@ class PluriWaveTokens extends ThemeExtension<PluriWaveTokens> {
           Color.lerp(glassSurface, other.glassSurface, t) ?? glassSurface,
       glassBorder: Color.lerp(glassBorder, other.glassBorder, t) ?? glassBorder,
       glowColor: Color.lerp(glowColor, other.glowColor, t) ?? glowColor,
+      listSurface: Color.lerp(listSurface, other.listSurface, t) ?? listSurface,
+      liveGreen: Color.lerp(liveGreen, other.liveGreen, t) ?? liveGreen,
+      offlineAccent:
+          Color.lerp(offlineAccent, other.offlineAccent, t) ?? offlineAccent,
       radiusSm: lerpDouble(radiusSm, other.radiusSm, t) ?? radiusSm,
       radiusMd: lerpDouble(radiusMd, other.radiusMd, t) ?? radiusMd,
       radiusLg: lerpDouble(radiusLg, other.radiusLg, t) ?? radiusLg,