style: Update form theme colors for light mode

This commit refines the visual styling of form components by adjusting the light mode color palette for `SliderTheme` and `SwitchTheme` in `lib/screens/widgets/overrides/form_themes.dart`.

### Key Changes:

*   **SliderTheme Adjustments:**
    *   Updated `trackColor` from gray to `blue[200]` in light mode.
    *   Updated `valueColor` and `thumbColor` from gray to `blue[900]` in light mode.

*   **SwitchTheme Adjustments:**
    *   Updated `inactiveThumbColor` from `blue[400]` to `blue[900]` in light mode to ensure consistency across form controls.

Author: vmeng-b

lib/screens/widgets/overrides/form_themes.dart

@@ -33,17 +33,17 @@ class FormThemes extends StatelessWidget {
           ),
           child: ComponentTheme(
             data: SliderTheme(
-              trackColor: isDark ? Colors.gray[500] : Colors.gray[500],
-              valueColor: isDark ? Colors.gray[100] : Colors.gray[100],
-              thumbColor: isDark ? Colors.gray[100] : Colors.gray[100],
+              trackColor: isDark ? Colors.gray[500] : Colors.blue[200],
+              valueColor: isDark ? Colors.gray[100] : Colors.blue[900],
+              thumbColor: isDark ? Colors.gray[100] : Colors.blue[900],
               thumbBorderColor: isDark ? Colors.blue[900] : Colors.blue[900],
             ),
             child: ComponentTheme(
               data: SwitchTheme(
                 activeColor: isDark ? Colors.blue[400] : Colors.blue[300],
                 activeThumbColor: isDark ? Colors.blue[900] : Colors.blue[900],
                 inactiveColor: isDark ? Colors.gray[500] : Colors.gray[200],
-                inactiveThumbColor: isDark ? Colors.gray[200] : Colors.blue[400],
+                inactiveThumbColor: isDark ? Colors.gray[200] : Colors.blue[900],
               ),
               child: child,
             ),