[FEATURE]: Desktop inline conversation visualizations

Feature hasn't been suggested before.

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Describe the enhancement you want to request

Allow the Desktop app to render agent-created interactive visualizations directly in the conversation instead of writing an HTML file and opening a browser.

The capability should use a dedicated built-in tool with versioned structured output, render only on Desktop, and keep Web disabled. The Desktop renderer should own the document and transparent canvas, execute the fragment in a restricted sandbox with no network or navigation privileges, resize to its content, inherit the active theme, and require confirmation before a visualization can send a follow-up prompt.

This would support charts, simulators, clocks, and small interactive explainers while keeping execution isolated from the host application and session APIs.