feat: enhance DropdownMenu with hover trigger support

[gene9831]

Summary by CodeRabbit

• New Features

  • Added support for hover-triggered dropdown menus, allowing users to open dropdowns by hovering over the trigger element.

• Documentation

  • Updated documentation to reflect the new hover trigger mode and clarified customization options for the dropdown menu component.

• Refactor

  • Improved dropdown menu styling flexibility using CSS variables and enhanced transition effects.

• Style

  • Updated visual styles for dropdown menus, including hover backgrounds and removal of certain font weights.

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Walkthrough

The changes introduce a "hover" trigger mode to the dropdown menu component, update its demo and documentation to reflect the new behavior, and refactor the component's logic and styling to support hover interactions and CSS variable-based customization. Type definitions and event handling were also adjusted for improved flexibility.

Changes

File(s)	Change Summary
docs/demos/dropdown-menu/basic.vue	Added a new demo section with two horizontally arranged dropdowns using the hover trigger and logging clicks.
docs/src/components/dropdown-menu.md	Updated documentation: added 'hover' to trigger prop, removed minWidth/topOffset, clarified slots/events.
packages/components/src/base-popper/index.vue	Made TriggerEvents type properties optional by changing from Record to Partial<Record>.
packages/components/src/dropdown-menu/index.type.ts	Extended trigger prop to include 'hover', removed minWidth, added click-outside event to emits interface.
packages/components/src/dropdown-menu/index.vue	Refactored trigger logic to support 'hover', updated event handling, styling via CSS variables, and transitions.

Sequence Diagram(s)

sequenceDiagram
    participant User
    participant DropdownMenu
    participant Console

    User->>DropdownMenu: Hover over trigger (trigger="hover")
    DropdownMenu->>DropdownMenu: Detect hover (with delay)
    DropdownMenu->>DropdownMenu: Show dropdown menu
    User->>DropdownMenu: Move cursor away (trigger="hover")
    DropdownMenu->>DropdownMenu: Detect hover leave (with delay)
    DropdownMenu->>DropdownMenu: Hide dropdown menu
    User->>DropdownMenu: Click menu item
    DropdownMenu->>Console: Log clicked item

Loading

Poem

A dropdown now floats on a hover so light,
With menus that open in gentle delight.
CSS variables dance, transitions anew,
Docs and types polished with clarity too.
Rabbits rejoice—such features we favor,
For menus that open with elegant flavor!
🐇✨

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[gene9831]

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