In library, add component `expand link` (update v2.5)

Description

Verbatims of @MaximeTonnerre

Release not
- The specific component “On colored bg” has been split into two distinct components:
- A public version offering traditional management of dark and light modes
- A private version (allowing the core team to nest the component with other components) offering customized mode management with four possible configurations:
- Always in light mode
- Always in dark mode
- Light to dark mode
- Dark to light mode
- Consequently, for the private version, the name of the “Inverted color” variant has been replaced to “Mode control”.

Definition of Ready

To be defined

Definition of Done

To be defined

Resources

See internal Figma