Add ActionButton2L documentation to README

[Copilot]

The ActionButton2L component was missing documentation in the README.

Added Documentation

• Component overview: Two-level action button with dropdown menu and keyboard navigation
• Props table: All inherited ActionButton props plus options array for menu items
• Events: open, close, select with payload specifications
• MenuOption interface: TypeScript definition showing label, action, and optional disabled
• Keyboard navigation: Arrow keys, Enter, Escape behavior and automatic focus management
• Accessibility: ARIA attributes, screen reader support, and focus patterns
• Usage examples: Basic usage, event handlers, async actions, and common patterns (table row actions, conditional options)

Example

<ActionButton2L
  :item="user"
  icon="fa-solid fa-ellipsis-vertical"
  tooltip-text="User actions"
  :options="[
    { label: 'Edit', action: handleEdit },
    { label: 'Delete', action: handleDelete },
    { label: 'Deactivate', action: handleToggle, disabled: user.status !== 'active' }
  ]"
  @select="({ option, index }) => console.log('Selected:', option.label)"
/>

Original prompt

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This section details on the original issue you should resolve

<issue_title>ActionButton2L</issue_title>
<issue_description>Add ActionButton2L documentation to README</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes ActionButton2L #8

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