(chore) added text streaming for Guided Prompt pattern

[plamenivanov91]

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[ui5-webcomponents-bot]

🧹 Preview deployment cleaned up: https://pr-12931--ui5-webcomponents.netlify.app

[kgogov]

Hello @plamenivanov91,

I reviewed your changes, and overall the text‑streaming imitation in the sample works similarly to the AI QuickPrompt sample. However, there is one detail that stood out to me.

When we click the "Generate" button in QuickPrompt, the busy indicator appears first, and after a short delay the text starts streaming. In contrast, in GuidedPrompt we don’t see this behavior.

With GuidedPrompt, when clicking "Generate", a dialog opens where we configure how we want the text to be generated. After clicking "Apply", the text begins streaming immediately, and only after some time the busy indicator appears.

I know this may seem minor, but I think it would be good for both samples to behave consistently. In my opinion, the effect in QuickPrompt better simulates the real interaction experience with an AI chat.

[kgogov]

Suggestion: try to make the busy indicator behave the same way as in the AI QuickPrompt sample.

[plamenivanov91]

Suggestion: try to make the busy indicator behave the same way as in the AI QuickPrompt sample.

Thanks for the review. Yes, in the quick prompt there is a 2s delay before the text streaming begins to achieve the effect you mentioned. So I did something similar in this PR.