fix(cua): switch anthropic computer-use defaults to claude-sonnet-4-6

[rgarcia]

Summary

• update the TypeScript anthropic computer-use template to use claude-sonnet-4-6 as the default model
• update the Python anthropic computer-use template to use claude-sonnet-4-6 as the default model
• remove the dated model suffix from new template defaults so generated apps use the stable alias

Test plan

• make test

Made with Cursor

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Note

Medium Risk
Medium risk because it changes generated template behavior (default model selection and Anthropic tool version/beta flags) and adjusts TypeScript SDK typings, which could break newly scaffolded apps if versions drift.

Overview
Switches the Anthropic Computer Use templates (Python + TypeScript) to default to the stable claude-sonnet-4-6 model alias and introduces a new computer_use_20251124 tool version (with corresponding computer_20251124 tool) that is auto-selected for newer Claude models unless explicitly overridden.

Cleans up the TypeScript template by removing luxon (using Intl.DateTimeFormat instead), updating @onkernel/sdk to ^0.35.0, tightening tool param types to Anthropic SDK-provided unions, and making browser liveViewUrl/replayViewUrl explicitly nullable.

Updates the scaffolding copier (CopyTemplateFiles) to skip common artifact directories (node_modules, .venv, __pycache__) during template copy, with a new test to enforce this behavior.

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