Library theming: Update Menu and Menu toggle components in design kit #971

Update the Menu and Menu toggle components in the PatternFly design kit to align with the unified theme. Update Figma files, styles, documentation, and ensure unified visual consistency throughout.

Deliverables:

• Update tokens

• Include new variants

• Update branded icons

• Address audit fixes:

• Boolean inconsistency updates (checklist here)

• Add small size variant of menu toggle

• Menu dropdown caret doesn't hold position when resizing - fix auto layout so that the caret stays 16px from the right edge of the toggle

• Favorite icon:** **The pattern we use for favouriting uses a gold star icon when selected. This gold colour is close to a colour contrast issue so the team has decided to switch to using an unfilled star by default that transitions to a filled star icon. The new animation styling is still applicable with this update.

• Default: Filled black star

• Hover: No icon change button background colour changes

• Click: Animating transition with short scale change and colour from black to gold.

Jira Issue: PF-3919