feat(tui): show explicit subagent model - #49388

Summary

• Show the model after a subagent task when the tool call includes an explicit model override.
• Resolve the configured display name and include an explicit variant when present.
• Preserve the existing row when no model override was requested, with the raw reference as a fallback for unavailable models.

Verification

• bun test test/cli/tui/inline-tool-wrap-snapshot.test.tsx
• bun typecheck in packages/tui
• OpenCode Drive before/after capture at 2cdd938152274f18eda570b975c91780c3d0dd76 and 55a7dd199ac87b8ebae37dd8b3d8378dce0c368c
• bun run check completed lint with zero findings; the monorepo typecheck was unable to finish on the shared host because OS thread creation hit the host process limit. The affected-package typecheck above passed.

Requested by: @kitlangton (Kit via Slack)