style: apply dart formatting fixes across lib/ and test/

11 files had formatting inconsistencies that caused the
--set-exit-if-changed gate to fail. Automated formatting
via dart format now passes cleanly.

lib/app_theme_business_object.dart

@@ -25,36 +25,52 @@ class AppThemeColors {
 
   /// Website: `primary` → headings (h1–h6)
   final Color headingColor;
+
   /// Website: `accent` → links & accent highlights
   final Color accentColor;
+
   /// Page background gradient start — website: `background` (cream)
   final Color scaffoldGradientStart;
+
   /// Page background gradient end — website: `light`
   final Color scaffoldGradientEnd;
+
   /// Top header card surface
   final Color shellSurface;
+
   /// Top header card border
   final Color shellBorder;
+
   /// Website: `medium` → muted / secondary text
   final Color mutedText;
+
   /// Website: `white` → text on dark surfaces
   final Color textOnDark;
+
   /// Website: `light` → secondary text on dark surfaces
   final Color textOnDarkSecondary;
+
   /// Controls bar / card surface gradient start — website: `primary_dark`
   final Color controlsGradientStart;
+
   /// Controls bar / card surface gradient end — website: `primary_dark`
   final Color controlsGradientEnd;
+
   /// Shadow color for elevated surfaces
   final Color controlsShadow;
+
   /// Website: `text` → body text
   final Color bodyText;
+
   /// Inner card background overlay — derived from `primary_dark` / `primary_light`
   final Color cardSurface;
+
   /// Inner card border — derived from `primary_dark` / `primary_light`
   final Color cardBorder;
+
   /// Website: `success` → live indicator, success states
   final Color successColor;
+
   /// Website: `danger` → error states
   final Color dangerColor;
 }