feat(codex): add reasoning off option

[maria-rcks]

What Changed

Adds an Off option to the Codex reasoning picker for reasoning-capable models when the Codex app-server model list does not advertise the none effort.

The underlying protocol value remains none; only the UI label is shown as Off.

Why

The Codex app-server schema accepts reasoning_effort: "none", and t3code already forwards selected reasoning effort values. This makes the existing picker able to disable reasoning without adding new UI or changing dispatch behavior.

UI Changes

This changes the Codex reasoning picker options by showing Off.

Checklist

• This PR is small and focused
• I explained what changed and why
• I included before/after screenshots for any UI changes
• I included a video for animation/interaction changes

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Note

Low Risk
Low risk: changes only affect how reasoning-effort options are labeled and populated for Codex models, without altering request/dispatch semantics.

Overview
Updates the Codex model capability mapping to always offer a reasoning-disable option by injecting the none effort when a model advertises reasoning efforts but omits it.

Renames the none reasoning effort label from "None" to "Off", while keeping the underlying protocol value as none and preserving default selection behavior.

^{Reviewed by Cursor Bugbot for commit 662a1eb. Bugbot is set up for automated code reviews on this repo. Configure here.}

Note

Add 'Off' reasoning effort option to Codex model capabilities

• Renames the none reasoning effort label from 'None' to 'Off' in REASONING_EFFORT_LABELS.
• Updates mapCodexModelCapabilities in CodexProvider.ts to always inject a none effort option when a model exposes at least one reasoning effort but omits none.
• The default option continues to be derived from model.defaultReasoningEffort.

^{Macroscope summarized 662a1eb.}

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[macroscopeapp]

Approvability

Verdict: Needs human review

This PR introduces a new user-facing feature by adding a 'none' (labeled 'Off') reasoning effort option for models that didn't previously expose it. Changes that add new user-facing behavior warrant human review.

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