Run template, Designer, accessibility, and deployment exploratory testing

## Objective

Exercise generated projects in Visual Studio and CLI workflows, Designer round trips, light/Dark/Classic modes, keyboard and accessibility basics, Terminal Services, Windows on ARM, slow hardware, packaged/unpackaged deployment, and restricted/offline environments.

## Completion guidance

- Keep the implementation focused on the objective while allowing the assignee to improve the approach based on research.
- Document important decisions, rejected alternatives, dependencies, and follow-up work.
- Add or update tests and documentation appropriate to the work.
- Verify locally and in CI where the task changes code or generated artifacts.

Start by reviewing the objective and completion guidance, then plan exploratory runs across the listed Visual Studio, CLI, Designer, accessibility, hardware, deployment, and offline scenarios. No specific files, tests, or entry points are named. Done means documenting important decisions, rejected alternatives, dependencies, follow-up work, and any appropriate tests or documentation, with local and CI verification when code or generated artifacts change.

Written by the indexing model from the issue text.