refactor: remove unused shared module and improve ConfirmDialog UI

- Remove src/burpEx/shared module (empty and unused)
- Update parent pom.xml to remove shared module reference
- Redesign ConfirmDialog with modern centered layout
- Add large circular icon with gradient background
- Improve button styling with hover effects
- Add smooth enter animation with bounce effect
- Update dark mode styles for better contrast

Author: lanshuizhiyue

src/burpEx/pom.xml

@@ -21,7 +21,6 @@
     </properties>
 
     <modules>
-        <module>shared</module>
         <module>legacy-api</module>
         <module>montoya-api</module>
     </modules>