Add right-click trigger for reactions/context menu on desktop & web

[shkvoretz]

Summary

This PR introduces right-click support (secondary mouse button) for opening the chat reactions and/or context menu when running on desktop and web platforms. The package previously only supported long-press (and optionally double-tap) as trigger mechanisms.

With this update, apps using a mouse can now invoke the reactions popup using the expected interaction model for desktop chat applications (e.g., Slack, Discord, Telegram Desktop).

⸻

Motivation

The original gesture model was optimized primarily for mobile usage. However, when integrating this package in a cross-platform chat app, right-click interaction is essential for desktop/web UX consistency.

This change enables developers to maintain the same reactions menu behavior across input devices without needing to fork or wrap the library externally.

⸻

What Was Changed
• Wrapped the message child with a Listener to detect pointer events.
• When enableRightClick is enabled and the event is:
• PointerDeviceKind.mouse
• kSecondaryMouseButton (right click)
→ the reactions/context menu is shown.
• Added enableRightClick field to ChatReactionsConfig with default false so behavior remains backward-compatible.

ChatReactionsConfig(
  enableLongPress: true,
  enableRightClick: true, //  this is new
)

[gemini-code-assist]

Summary of Changes

Hello @shkvoretz, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request significantly enhances the chat_reactions package by integrating right-click functionality for triggering reaction menus on desktop and web environments. This change addresses the need for a more intuitive and consistent user experience across different platforms, particularly for mouse-driven interfaces, by adopting a widely recognized interaction pattern. It provides developers with a flexible configuration option to enable this behavior, ensuring seamless integration into cross-platform chat applications.

Highlights

• Desktop/Web Right-Click Support: Introduces the ability to open the chat reactions/context menu using a right-click (secondary mouse button) on desktop and web platforms.
• Enhanced Cross-Platform UX: Improves user experience consistency by providing a standard interaction model for mouse-based chat applications, aligning with common desktop patterns like those found in Slack or Discord.
• Configurable Behavior: Adds a new onSecondaryTapDown boolean property to ChatReactionsConfig, allowing developers to enable or disable this feature, with a default value of false for backward compatibility.

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[gemini-code-assist]

Code Review

This pull request introduces a useful feature for desktop and web users by adding right-click support to trigger the reactions menu. The implementation is straightforward and correctly uses onSecondaryTapDown. My main feedback is to improve the naming of the new configuration property for better clarity and consistency with existing properties. I've suggested changing onSecondaryTapDown to enableRightClick as used in the PR description. This will make the API more intuitive for developers using the package.