refactor: Simplify AppPalette color definitions and gradients for improved readability

lib/theme/app_palette.dart

@@ -25,70 +25,6 @@ class AppPalette extends ThemeExtension<AppPalette> {
     Colors.orange,
   ];
 
-  static const Gradient _darkBackdropGradient = LinearGradient(
-    colors: <Color>[Color(0xFF191A1D), Color(0xFF222326), Color(0xFF101114)],
-    begin: Alignment.topLeft,
-    end: Alignment.bottomRight,
-  );
-
-  static const Gradient _lightBackdropGradient = LinearGradient(
-    colors: <Color>[Color(0xFFFFFFFF), Color(0xFFF2F4F6), Color(0xFFECEFF1)],
-    begin: Alignment.topLeft,
-    end: Alignment.bottomRight,
-  );
-
-  static const Color _darkDrawerBackground = Color.fromARGB(255, 30, 31, 35);
-  static const Color _lightDrawerBackground = Color(0xFFF7F9FA);
-  static const Color _darkCardBackground = Color.fromRGBO(24, 25, 26, 1);
-  static const Color _lightCardBackground = Color(0xFFFFFFFF);
-  static const Color _darkSurfaceElevated = Color(0xFF303134);
-  static const Color _lightSurfaceElevated = Color(0xFFF0F2F4);
-  static const Color _darkBorder = Color.fromRGBO(255, 255, 255, 0.12);
-  static const Color _lightBorder = Color.fromRGBO(15, 23, 32, 0.06);
-  static const Color _darkBorderMuted = Color.fromRGBO(255, 255, 255, 0.08);
-  static const Color _lightBorderMuted = Color.fromRGBO(15, 23, 32, 0.03);
-  static const Color _darkTextPrimary = Colors.white;
-  static const Color _lightTextPrimary = Color(0xFF0F1720);
-  static const Color _darkTextSecondary = Colors.white70;
-  static const Color _lightTextSecondary = Color(0xFF374151);
-  static const Color _darkTextOnSurfaceDark = Colors.black87;
-  static const Color _lightTextOnSurfaceDark = Colors.black87;
-  static const Color _darkTextMuted = Colors.white54;
-  static const Color _lightTextMuted = Color(0xFF6B7280);
-  static const Color _darkTextDisabled = Colors.white24;
-  static const Color _lightTextDisabled = Color(0xFFBDBDBD);
-  static const Color _darkTextHint = Color.fromRGBO(255, 255, 255, 0.30);
-  static const Color _lightTextHint = Color.fromRGBO(15, 23, 32, 0.30);
-  static const Color _darkFill = Color.fromRGBO(255, 255, 255, 0.05);
-  static const Color _lightFill = Color.fromRGBO(15, 23, 32, 0.02);
-  static const Color _darkHover = Color.fromRGBO(255, 255, 255, 0.10);
-  static const Color _lightHover = Color.fromRGBO(15, 23, 32, 0.04);
-  static const Color _darkShadowSoft = Color.fromRGBO(0, 0, 0, 0.25);
-  static const Color _lightShadowSoft = Color.fromRGBO(0, 0, 0, 0.08);
-  static const Color _darkShadowDim = Color.fromARGB(54, 0, 0, 0);
-  static const Color _lightShadowDim = Color.fromARGB(40, 0, 0, 0);
-  static const Color _darkAccent = Colors.amber;
-  static const Color _lightAccent = Colors.blue;
-  static const Color _darkTextOnAccent = Colors.black;
-  static const Color _lightTextOnAccent = Colors.white;
-  static const Color _darkOverlay = Color.fromARGB(140, 0, 0, 0);
-  static const Color _lightOverlay = Color.fromARGB(120, 0, 0, 0);
-  static const Color _transparent = Colors.transparent;
-  static const Color _darkDragTargetBorder = Color(0xFF42A5F5);
-  static const Color _lightDragTargetBorder = Color(0xFF1565C0);
-  static const Color _darkSyncPreparing = Color.fromARGB(255, 165, 165, 165);
-  static const Color _lightSyncPreparing = Color.fromARGB(255, 120, 120, 120);
-  static const Color _darkSyncEncrypting = Color.fromARGB(255, 109, 191, 255);
-  static const Color _lightSyncEncrypting = Color.fromARGB(255, 2, 136, 209);
-  static const Color _darkSyncUploading = Color.fromARGB(255, 98, 190, 255);
-  static const Color _lightSyncUploading = Color.fromARGB(255, 2, 119, 189);
-  static const Color _darkSyncWaiting = Color.fromARGB(255, 150, 150, 150);
-  static const Color _lightSyncWaiting = Color.fromARGB(255, 150, 150, 150);
-  static const Color _darkSyncDecrypting = Color.fromARGB(255, 154, 194, 112);
-  static const Color _lightSyncDecrypting = Color.fromARGB(255, 76, 175, 80);
-  static const Color _darkSuccess = Colors.green;
-  static const Color _lightSuccess = Colors.green;
-
   const AppPalette({
     required this.backdropGradient,
     required this.drawerBackground,
@@ -280,42 +216,88 @@ class AppPalette extends ThemeExtension<AppPalette> {
     final bool isLight = brightness == Brightness.light;
     return AppPalette(
       backdropGradient: isLight
-          ? _lightBackdropGradient
+          ? const LinearGradient(
-          : _darkBackdropGradient,
+              colors: <Color>[
+                Color(0xFFFFFFFF),
+                Color(0xFFF2F4F6),
+                Color(0xFFECEFF1),
+              ],
+              begin: Alignment.topLeft,
+              end: Alignment.bottomRight,
+            )
+          : const LinearGradient(
+              colors: <Color>[
+                Color(0xFF191A1D),
+                Color(0xFF222326),
+                Color(0xFF101114),
+              ],
+              begin: Alignment.topLeft,
+              end: Alignment.bottomRight,
+            ),
       drawerBackground: isLight
-          ? _lightDrawerBackground
+          ? const Color(0xFFF7F9FA)
-          : _darkDrawerBackground,
+          : const Color.fromARGB(255, 30, 31, 35),
-      cardBackground: isLight ? _lightCardBackground : _darkCardBackground,
+      cardBackground: isLight
+          ? const Color(0xFFFFFFFF)
+          : const Color.fromRGBO(24, 25, 26, 1),
       categoryColors: defaultCategoryColors,
-      surfaceElevated: isLight ? _lightSurfaceElevated : _darkSurfaceElevated,
+      surfaceElevated: isLight
-      border: isLight ? _lightBorder : _darkBorder,
+          ? const Color(0xFFF0F2F4)
-      borderMuted: isLight ? _lightBorderMuted : _darkBorderMuted,
+          : const Color(0xFF303134),
-      accent: seedColor ?? (isLight ? _lightAccent : _darkAccent),
+      border: isLight
-      textPrimary: isLight ? _lightTextPrimary : _darkTextPrimary,
+          ? const Color.fromRGBO(15, 23, 32, 0.06)
-      textSecondary: isLight ? _lightTextSecondary : _darkTextSecondary,
+          : const Color.fromRGBO(255, 255, 255, 0.12),
-      textOnSurfaceDark: isLight
+      borderMuted: isLight
-          ? _lightTextOnSurfaceDark
+          ? const Color.fromRGBO(15, 23, 32, 0.03)
-          : _darkTextOnSurfaceDark,
+          : const Color.fromRGBO(255, 255, 255, 0.08),
-      textMuted: isLight ? _lightTextMuted : _darkTextMuted,
+      accent:
-      textDisabled: isLight ? _lightTextDisabled : _darkTextDisabled,
+          seedColor ??
-      textHint: isLight ? _lightTextHint : _darkTextHint,
+          (isLight
-      fill: isLight ? _lightFill : _darkFill,
+              ? AppPalette.lightDefaultThemeSeedColor
-      hover: isLight ? _lightHover : _darkHover,
+              : AppPalette.darkDefaultThemeSeedColor),
-      shadowSoft: isLight ? _lightShadowSoft : _darkShadowSoft,
+      textPrimary: isLight ? const Color(0xFF0F1720) : Colors.white,
-      shadowDim: isLight ? _lightShadowDim : _darkShadowDim,
+      textSecondary: isLight ? const Color(0xFF374151) : Colors.white70,
+      textOnSurfaceDark: isLight ? Colors.black87 : Colors.black87,
+      textMuted: isLight ? const Color(0xFF6B7280) : Colors.white54,
+      textDisabled: isLight ? const Color(0xFFBDBDBD) : Colors.white24,
+      textHint: isLight
+          ? const Color.fromRGBO(15, 23, 32, 0.30)
+          : const Color.fromRGBO(255, 255, 255, 0.30),
+      fill: isLight
+          ? const Color.fromRGBO(15, 23, 32, 0.02)
+          : const Color.fromRGBO(255, 255, 255, 0.05),
+      hover: isLight
+          ? const Color.fromRGBO(15, 23, 32, 0.04)
+          : const Color.fromRGBO(255, 255, 255, 0.10),
+      shadowSoft: isLight
+          ? const Color.fromRGBO(0, 0, 0, 0.08)
+          : const Color.fromRGBO(0, 0, 0, 0.25),
+      shadowDim: isLight
+          ? const Color.fromARGB(40, 0, 0, 0)
+          : const Color.fromARGB(54, 0, 0, 0),
       destructiveAccent: Colors.redAccent,
-      textOnAccent: isLight ? _lightTextOnAccent : _darkTextOnAccent,
+      textOnAccent: isLight ? Colors.white : Colors.black,
-      overlay: isLight ? _lightOverlay : _darkOverlay,
+      overlay: isLight
-      transparent: _transparent,
+          ? const Color.fromARGB(120, 0, 0, 0)
+          : const Color.fromARGB(140, 0, 0, 0),
+      transparent: Colors.transparent,
       dragTargetBorder: isLight
-          ? _lightDragTargetBorder
+          ? const Color(0xFF1565C0)
-          : _darkDragTargetBorder,
+          : const Color(0xFF42A5F5),
-      syncPreparing: isLight ? _lightSyncPreparing : _darkSyncPreparing,
+      syncPreparing: isLight
-      syncEncrypting: isLight ? _lightSyncEncrypting : _darkSyncEncrypting,
+          ? const Color.fromARGB(255, 120, 120, 120)
-      syncUploading: isLight ? _lightSyncUploading : _darkSyncUploading,
+          : const Color.fromARGB(255, 165, 165, 165),
-      syncWaiting: isLight ? _lightSyncWaiting : _darkSyncWaiting,
+      syncEncrypting: isLight
-      syncDecrypting: isLight ? _lightSyncDecrypting : _darkSyncDecrypting,
+          ? const Color.fromARGB(255, 2, 136, 209)
-      success: isLight ? _lightSuccess : _darkSuccess,
+          : const Color.fromARGB(255, 109, 191, 255),
+      syncUploading: isLight
+          ? const Color.fromARGB(255, 2, 119, 189)
+          : const Color.fromARGB(255, 98, 190, 255),
+      syncWaiting: const Color.fromARGB(255, 150, 150, 150),
+      syncDecrypting: isLight
+          ? const Color.fromARGB(255, 76, 175, 80)
+          : const Color.fromARGB(255, 154, 194, 112),
+      success: Colors.green,
     );
   }
 }