Status bar widget for deepagents-cli.
A label that displays a model name, right-aligned with smart truncation.
When the full provider:model text doesn't fit, the provider is dropped
first. If the bare model name still doesn't fit, it is left-truncated
with a leading ellipsis so the most distinctive tail stays visible.
Status bar showing mode, auto-approve, cwd, git branch, tokens, and model.
