Investigate code duplication between cc-dialog and cc-drawer

[pdesoyres-cc]

Context

cc-dialog and cc-drawer share significant implementation details since both are built on top of the native <dialog> element with modal behavior.

Shared code

• Properties: heading, open
• Internal state: _dialogRef, _openerElement
• Public methods: show(), hide()
• Private methods: _autofocusOnOpen(), _tryToFocusOpenerElement(), _onDialogClose()
• Lifecycle logic: Opening/closing behavior in updated(), focus restoration in disconnectedCallback()
• Events: CcOpenEvent, CcCloseEvent, CcFocusRestorationFailEvent
• Styles: ::backdrop styling, accessibilityStyles

Why this matters

• Code duplication increases maintenance burden
• Risk of inconsistent behavior if one component is updated but not the other
• Shared accessibility and focus management logic should behave identically

Next steps

Evaluate whether and how to reduce this duplication (mixin, base class, controller, or leave as-is if the cost outweighs the benefits).