Appfunctions media attachments

[calebareeveso]

Screenshots

What I have done and why

Added support for sending image attachments and changing chat wallpapers across the Agent and ChatApp, and updated all code to work with appfunctions 1.0.0-alpha10 .

Summary of Changes

ChatApp:

• Added imageUris to send(...) so users can attach images to chat messages.
• Added updateChatWallpaper(...) so users can change a conversation's wallpaper.
• Updated chat AppFunctions to the new 1.0.0-alpha10 AppFunctionService format.

Agent App:

• Automatically grants temporary read permission (FLAG_GRANT_READ_URI_PERMISSION ) whenever sending local content:// image URIs to another app
• Displays image preview cards in the chat window for AI-generated images
• Fixed an API crash (HTTP 400 Duplicate function declaration) that happened when both phone and Wear OS companion apps were installed

[gemini-code-assist]

Code Review

This pull request introduces support for custom chat wallpapers in the ChatApp and adds image generation capabilities to the AI agent using the Gemini API. Key changes include the creation of a WallpaperRepository to manage chat backgrounds, updates to the UI to render wallpapers, and enhancements to the agent's orchestrator to handle remote file references, download them to local cache, and grant URI permissions. Feedback on these changes highlights three main areas for improvement: adding connection and read timeouts to the HttpURLConnection used for downloading files, offloading blocking disk I/O operations in the wallpaper flow to Dispatchers.IO to prevent UI stutters, and wrapping contentResolver.openInputStream in a try-catch block to gracefully handle potential security or file-not-found exceptions.

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