Upgrade to Termina 0.16.1 and preserve TUI state

[Aaronontheweb]

Summary

• Update Termina from 0.16.0 to 0.16.1.
• Use keyed dynamic layouts for provider, model, and MCP workflows.
• Preserve stateful controls while each logical screen remains active.
• Replace owned controls after a screen transition.
• Keep model role values separate from their display text.
• Select all discovered tools when a user enables MCP server access.
• Replace an old empty or partial grant set on the first enable action.
• Clear effective tool access when a user disables MCP server access.

Validation

• The solution build passed with zero warnings and zero errors.
• All 16 MCP permission view-model tests passed.
• The native smoke harness passed all 23 tapes and 9 scenarios.
• Slopwatch found zero issues.
• The file header check passed.
• The diff check passed.

Fixes #1823

[Aaronontheweb]

I fixed the first-enable MCP permission defect from #1823.

The enable action now replaces an old empty or partial grant set with all discovered tools.

The disable action still clears effective tool access.

Validation:

• 16 MCP permission view-model tests passed.
• The solution build passed with zero warnings.
• Slopwatch found no issues.
• The file-header check passed.
• All 23 native tapes passed.
• All 9 smoke scenarios passed.