[FirebaseAI] Multimodal Attachment Preview Fix

[YoungHypo]

Problem

Broken preview flow: Current attachment preview card in MultimodalScreen did not show the custom card UI.

Fix

implemented extension View for MultimodalAttachment so each attachment supplies its own card (AttachmentPreview). This aligns with ConversationKit’s expectations. peterfriese/ConversationKit#20

MIME conformance: I synced supportedFileExtensions and getMimeType with the official Firebase AI multimodal doc (image/video/audio/doc types now match the published list exactly). https://firebase.google.com/docs/ai-logic/input-file-requirements?api=dev

[gemini-code-assist]

Summary of Changes

Hello @YoungHypo, 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 addresses a critical issue where multimodal attachment previews were not rendering correctly. It introduces a more robust and flexible preview mechanism by allowing each MultimodalAttachment to define its own preview UI using a ViewBuilder. Concurrently, it updates the application's file type and MIME type mappings to ensure full compliance with the latest Firebase AI multimodal input requirements, enhancing compatibility and data integrity for various media and document attachments.

Highlights

• Attachment Preview Fix: The pull request resolves a broken attachment preview flow in the MultimodalScreen by implementing a @ViewBuilder public function previewView() within MultimodalAttachment. This allows each attachment to provide its own AttachmentPreviewCard, aligning with ConversationKit's expectations for custom card UI.
• MIME Type Conformance: The supportedFileExtensions and getMimeType definitions have been updated to strictly conform with the official Firebase AI multimodal documentation. This ensures accurate handling and validation of image, video, audio, and document types based on the published list of input file requirements.
• Simplified Preview Components: The AttachmentPreviewCard and AttachmentPreviewScrollView components have been simplified by removing the onRemove closure. The responsibility for preview logic and potential removal actions is now managed at a higher level, streamlining these UI elements.

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[gemini-code-assist]

Code Review

This pull request successfully fixes the multimodal attachment preview by implementing a custom previewView. Additionally, it updates the supported file extensions and MIME types to align with the Firebase AI documentation. While the UI fix is solid, the updates to file type handling have introduced a few issues. Specifically, support for the common .jpg extension has been dropped, there's an inconsistency in handling .pcm files, and a potentially incorrect mapping for .mpa files. I've provided detailed comments and suggestions to address these points.

[peterfriese]

LGTM, approved