Improve selection type documentation

- Refine tooltip documentation with clearer information.
- Introduce privacy ranking indicator for intuitive user guidance.
- Adopt a consistent format throughout documentation.
- Switch from emojis to icons to maintain visual uniformity.

src/presentation/assets/styles/_colors.scss

@@ -30,6 +30,10 @@ $color-on-surface           : #4d5156;
 // Background | Appears behind scrollable content.
 $color-background           : #e6ecf4;
 
+$color-success  : #4CAF50;
+$color-danger   : #F44336;
+$color-caution  : #FFC107;
+
 /*
     Application-specific colors:
     These are tailored to the specific needs of the application and derived from the above theme colors.