UI:
- Model sub-line under id only shows when it adds info. Hidden when
  a.model === a.id (redundant) or a.model === "default" (uninformative,
  as with Codex's account-picked default). Rows like `groq-llama-3.3-70b`
  keep the sub-line (id != model); rows like `claude-opus-4-8` (id ===
  model) or `codex` (model === "default") lose it. Less visual noise per
  row without losing signal.
- State column now hugs its pill (white-space:nowrap, no fixed width).
  Long `state.note` text moved into the pill's `title` attribute — hover
  reveals the full "verified (765ms)" / "paid plan required" / etc.
  without eating table width. Last-error inline preview under the pill
  keeps its own truncation + tooltip.
- `.pill[title]` gets cursor:help so the tooltip is discoverable.

No agents.yaml change.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>