Persist Codex Thinking Level and Fast Mode

[maskdotdev]

What Changed

Moved Codex reasoning effort and fast mode from thread local draft state to persisted global last used settings. ChatView, app settings, and composer draft persistence were updated so the composer follows the shared preference across threads and sessions, and the reasoning labels were centralized in one helper.

Why

resolve #384

Checklist

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

Video

t3code-persist-thinking.mp4

Note

Persist Codex reasoning effort and fast mode as global user preferences

• Adds defaultCodexReasoningEffort and lastUsedCodexFastMode to AppSettingsSchema so selections survive across threads and sessions.
• Changes codexFastMode in ComposerThreadDraftState from boolean to boolean | null, where null means "follow global preference" rather than an explicit off.
• When a user changes reasoning effort or fast mode in the composer, the new value is written to app settings and the per-thread override is cleared (set to null).
• Centralizes Codex reasoning effort display labels in a new CODEX_REASONING_EFFORT_LABELS export in packages/contracts/src/model.ts; both CodexTraitsPicker and CompactComposerControlsMenu now receive a defaultEffort prop to mark the current global default.
• Behavioral Change: previously, drafts with codexFastMode === false were treated identically to unset; they are now persisted as an explicit override, and only null signals absence.

^{Macroscope summarized deb11c8.}

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[juliusmarminge]

should behave similar to the draft state for model selected

CleanShot.2026-03-12.at.20.59.10.mp4