feat: Render question text and options with markdown

[dhbloo]

Summary

Render markdown in CLI-started question UIs so question prompts and option content display consistently with the main session output.

This updates both question tool variants:

• AskUserQuestion / ask_user_question
• request_user_input

And it covers both states:

• pending interaction footers
• read-only/history views

Changes

• render question body text with the existing shared markdown renderer
• render option labels with the existing shared markdown renderer
• render option descriptions with the existing shared markdown renderer
• keep option values, answer matching, and selection logic unchanged

Before

After

Scope

Intentionally narrow patch:

• web-only
• no hub / CLI / shared schema changes
• no transport changes
• no shared markdown renderer API changes

Testing

• bun run typecheck:web

Notes

• This reuses the app's existing markdown stack, so behavior matches current frontend markdown support.
• Unrelated local bun.lock changes were not included in this branch.

[github-actions]

Findings

• None.

Summary

• Review mode: initial. No issues found in modified lines. Residual risk: UI-only markdown rendering change not covered by automated web tests.

Testing

• Not run (automation).

HAPI Bot