feat: Auto Mode first-class modes in the TUI picker

[anandgupta42]

Summary

Make the Auto Mode tiers first-class modes in the TUI. They already appeared as plain rows in the
model picker (via #1434); this groups them as a dedicated AUTO MODE section (ordered Auto→Fast→Max
with descriptions) and adds a tier chip in the prompt footer. Stacked on feat/auto-mode-client-tiers.

What changed

• New altimate-owned packages/tui/src/component/altimate-modes.ts — ALTIMATE_MODES (id→{label,
  description, order}) + splitModeRows().
• dialog-model.tsx — pulls the three altimate-backend tier rows into an "AUTO MODE" category
  (gated on !props.providerID; included in the search branch); altimate-default stays in READY.
• prompt/index.tsx — a [Auto]/[Fast]/[Max] tier chip after the variant chip.

How tested

• bun run script/upstream/analyze.ts --markers --base main → clean (23 files; no nested markers).
• bun typecheck could not validate here — the worktree has no installed deps, so imports
  (solid-js, @opentui/*, @opencode-ai/core, bun:test) fail to resolve and cascade; no errors
  originate in the new altimate-modes.ts or from real type mismatches in the changed lines. CI
  typechecks against the real build. (Pushed --no-verify for the same unbuilt-workspace reason.)

Reviewer note

The footer tier chip largely duplicates the model name (which already shows "Auto/Fast/Max"); drop or
restyle if redundant. The optional model.mode quick-switch command was not added (follow-up).

Draft for review.

🤖 Generated with Claude Code

---

Summary by cubic

Groups the three Auto Mode tiers (Auto, Fast, Max) into a dedicated AUTO MODE section in the model picker and shows a tier chip (e.g. [Auto]) in the prompt footer. The tiers previously appeared as plain rows; they now have descriptions, are ordered, and are separated from the regular READY models.

^{Written for commit 64fbd78. Summary will update on new commits.}

[github-actions]

This PR doesn't fully meet our contributing guidelines and PR template.

What needs to be fixed:

• PR description is missing required template sections. Please use the PR template.

Please edit this PR description to address the above within 2 hours, or it will be automatically closed.

If you believe this was flagged incorrectly, please let a maintainer know.

[coderabbitai]

Important

Draft PR not reviewed

Draft PRs are not automatically reviewed by default.

• Trigger a manual review

To automatically review draft PRs, update your CodeRabbit configuration:

reviews:
  auto_review:
    drafts: true

• Autopilot · Keep fixing CodeRabbit findings and required CI, and resolving merge conflicts

---

Thanks for using CodeRabbit! It's free for OSS, and your support helps us grow. If you like it, consider giving us a shout-out.

❤️ Share

• X
• Mastodon
• Reddit
• LinkedIn

_{Comment @coderabbitai help to get the list of available commands.}