[aonnikov]

• Channels and direct chats remain visible when empty. Added showWhenEmpty and showInlineActions, enabled for both sections. Channel and direct chat creation actions now appear as + buttons next to the section header.
  NavGroup renders its own actions. Actions with inline: true appear as individual buttons; other actions go into the … menu. Added a right-click context menu. Actions can now be supplied through a function, including an asynchronous one.
• Restructured the header markup. The outer wrapper became a div, with a separate .hulyNavGroup-header__toggle button for expanding or selecting the group. Action buttons sit alongside it. The label and icon wrappers became span elements, which caused the current QMS selector issue.
• Removed duplicate rendering logic. TreeElement passes actions to NavGroup instead of rendering its own buttons. The card type navigator now uses an inline action for card creation, replacing its custom action slot.
• Adjusted styles. Tool and action buttons appear on hover, when the group is selected, or while its menu is open. Removed the pressed-state border color change for tertiary buttons.