Hide the plus button if no attachment actions are registered (#11)

[acs027]

Make attachmentActions optional to simplify checking for actions
Add an attachment action to the preview for demonstration
Add a preview showing the composer without attachment actions

[gemini-code-assist]

Summary of Changes

Hello @acs027, 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 refines the MessageComposerView by introducing optionality for attachment actions. This change ensures that the UI element for attachment actions, typically a 'plus button', is only visible when actual actions are registered, thereby improving the user experience and simplifying the component's logic. The accompanying preview updates clearly demonstrate this new conditional behavior.

Highlights

• Attachment Actions Optional: The attachmentActions environment value has been updated from AnyView to AnyView?, making it optional. This allows for a clear distinction between no actions being registered versus an empty set of actions.
• Conditional Plus Button Display: The 'plus button' (which triggers the attachment actions menu) in the MessageComposerView will now only be displayed if attachment actions are explicitly provided (i.e., attachmentActions is not nil) and attachments are not disabled.
• Enhanced Previews: The pull request includes an update to an existing preview to demonstrate how to register an attachment action, and introduces a new preview specifically showing the MessageComposerView without any registered attachment actions, illustrating the hidden plus button.

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[gemini-code-assist]

Code Review

This pull request effectively hides the attachment button when no actions are provided by making attachmentActions optional. The implementation is clean, and the addition of previews for both scenarios is a great improvement. I have one high-severity concern regarding an availability check that appears to be incorrect or at least confusing, which could lead to unexpected UI behavior on different OS versions.