client: avoid necessary network requests and fix focus loss

[nan-yu]

Description

The v0.8 Angular renderer's TextField and other input components were hardcoded to dispatch every input event as a server action, so local updates were also sent to the server. The MessageProcessor lacks a mechanism to distinguish between local state updates and global agent actions. This PR updates MessageProcessor to handle local notifications and modify input components (TextField, DateTimeInput, Checkbox, Slider and MultipleChoice to use these local notifications for intermediate updates.

There was also a focus loss issue caused by Angular recreating components on every keystroke. It was fixed by updating the Renderer to reuse components via ComponentRef instead of re-creating them on every update.

Before

• unnecessary network requests

unnecessary.network.requests.webm

• focus loss

Focus.loss.webm

After

• restaurant booking demo

booking.demo.webm

• contact lookup streaming demo

streaming.demo.for.contact.sample.webm

• full restaurant streaming demo:

Streaming.demo.for.restaurant.sample.webm

Pre-launch Checklist

• I signed the CLA.
• I read the Contributors Guide.
• I read the Style Guide.
• I have added updates to the CHANGELOG.
• I updated/added relevant documentation.
• My code changes (if any) have tests.

If you need help, consider asking for advice on the discussion board.

[gemini-code-assist]

Code Review

This pull request refactors Angular components to directly update the local data model for immediate UI feedback, reducing network requests. It also optimizes the MessageProcessor to use a version signal for better change detection with in-place mutations and introduces a focus loss prevention mechanism in the Renderer by updating component inputs in-place when the component identity remains the same. Feedback includes a high-severity issue regarding an incorrectly formatted valueMap in multiple-choice.ts that could lead to incorrect data model updates, and a medium-severity suggestion to improve type safety in renderer.ts by using a more specific type for componentRef.