SWF Editor - Refactoring and add Dark theme Style to SWF components

The goal of this task is to refactor SWF canvas components to support "light" and "dark" themes.

Note: This JIRA alone is focused only on changing the code to suport Themes, the API to set a theme will be implemented in other JIRA.

Dark mode look & feel:

Expected look & feel:

• There will be no changes in the light theme so it should remain as is.
• The dark theme color patterns must be compatible with VsCode and Backstage dark themes.