Default popover with title, description, arrow, and close trigger.

Uses `open` and `onOpenChange` to manage visibility state.

Content mounts only when opened (`lazyMount` + `unmountOnExit`).

Sets `positioning.placement` to render the popover on the right.

Uses explicit `positioning.offset` values for placement fine-tuning.

Uses `positioning.sameWidth` so panel width matches the trigger width.

Demonstrates a popover opened from inside another popover.

Shows form fields and footer actions rendered inside popover content.

Sets `initialFocusEl` so focus lands on the textarea when opened.

Applies `--popover-bg` to customize content and arrow background.

Uses popover inside dialog with fixed strategy and detached hiding.