style

- Wrap all field sections in .settings-subsection divs to match PageSettings structure
- Properly nest margin outer and inner collapsed sections within their parent subsections
- Replace custom color picker with Coloris integration for color and background fields
- Simplify reactive state by removing unused format and picker properties
- Initialize Coloris with dark theme, alpha support, and format toggle

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

public/assets/css/src/_forms.scss

@@ -79,7 +79,7 @@ input[type="number"] {
         width: 50%;
 
         label {
-          width: 50%;
+          width: 30%;
         }
 
         .input-with-unit {

public/assets/css/style.css

@@ -140,7 +140,7 @@ input[type=number] {
   width: 50%;
 }
 .settings-section .settings-subsection.margins .field label {
-  width: 50%;
+  width: 30%;
 }
 .settings-section .settings-subsection.margins .field .input-with-unit input {
   width: 50%;