[FirebaseAI] Use InputField component in GenerativeAITextExample

[YoungHypo]

All original features of GenerativeAITextExample are preserved. To modify the input field’s style, simply update the InputField component, ensuring a consistent user experience.

[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 refactors the user input interface within the GenerativeAITextExample by integrating a dedicated InputField component. The primary goal is to standardize the input field's appearance and behavior, leading to improved UI consistency and easier maintenance across the application, without altering the existing functionality.

Highlights

• UI Component Adoption: The GenerativeAITextExample now utilizes a shared InputField component, replacing a custom HStack with TextField and Button elements. This aligns the example with a standardized UI component.
• Code Simplification: This change simplifies the UI code within GenerateContentScreen.swift by abstracting the input field's structure and behavior into a reusable component, reducing boilerplate.
• Consistency and Maintainability: Adopting the InputField component ensures a consistent user experience across the application and centralizes styling and behavior modifications for input fields, improving overall maintainability.

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[gemini-code-assist]

Code Review

This pull request refactors the GenerateContentScreen to use the new reusable InputField component. The change successfully encapsulates the input field and submit button logic into a shared component, which improves code maintainability and readability. The original functionality, including text input, focus management, and submission handling via both the return key and the 'Go' button, is preserved. The implementation is clean and follows good SwiftUI practices. I found no issues of medium or higher severity.