Implement back in sample detail top bar

[lethargicpanda]

Implement back in sample detail top bar

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[lethargicpanda]

cc @JolandaVerhoef

[gemini-code-assist]

Summary of Changes

Hello @lethargicpanda, 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 introduces a significant overhaul of the Android AI Sample Catalog's user interface and underlying architecture. The primary goal is to enhance the sample detail top bar and standardize UI components across the application. This is achieved by extracting common UI elements into a new ui-component module, enabling a consistent and modern design system. Furthermore, two new AI samples, gemini-image-chat and gemini-video-metadata-creation, have been added, showcasing advanced Gemini model capabilities. Existing samples have been updated to leverage the new UI components and the latest Gemini Flash models, improving their visual appeal and functionality.

Highlights

• New UI Component Module: A dedicated module (ui-component) has been created to house reusable UI elements such as buttons, text inputs, dropdowns, and theming. This promotes consistency and simplifies future UI development across all samples.
• Enhanced Sample Detail UI: The top bar and card layouts for displaying individual AI samples have been completely redesigned, offering a more modern and informative user experience. This includes new "wide" and "row" card types and a dynamic top app bar.
• Introduction of New AI Samples: Two new samples, "Gemini Image Chat" and "Gemini Video Metadata Creation," have been integrated. These demonstrate multimodal capabilities (text + image input/output) and advanced video analysis (generating descriptions, chapters, hashtags, etc.) using the latest Gemini Flash models.
• Updated Gemini Model Integration: Existing samples (Chatbot, Multimodal, Video Summarization) have been upgraded to utilize the newer "Gemini Flash" models, and the Chatbot specifically now uses "gemini-2.5-flash".
• Refactored Sample Codebases: Several existing samples (Chatbot, Multimodal, Video Summarization, Image Description, Writing Assistance, Imagen, Magic Selfie, Live Todo) have undergone significant refactoring to adopt the new ui-component module, streamline their UI logic, and improve error handling.

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[gemini-code-assist]

Code Review

This pull request consistently implements the back button functionality across numerous sample screens by leveraging LocalOnBackPressedDispatcherOwner. The changes are correct and functional. However, this approach has introduced a bit of repetitive code in each screen. My review includes a suggestion to refactor SampleDetailTopAppBar to encapsulate the back navigation logic. This would provide a default behavior, reducing boilerplate code in all consumer screens and centralizing the logic. Applying this suggestion would allow for cleanup across all the modified sample screens.