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 across sessions and threads

• Adds defaultCodexReasoningEffort (default: "high") and lastUsedCodexFastMode (default: false) to app settings so selections survive page reloads.
• Changes codexFastMode in ComposerThreadDraftState from boolean to boolean | null, where null means "follow global setting" — explicit false is now preserved and persisted.
• The composer in ChatView.tsx initializes per-thread effort and fast mode from global settings when unset, and writes back to global settings on each selection.
• Adds resolveComposerReasoningEffort in ChatView.logic.ts to derive the active effort from the per-thread draft, falling back to the Codex global default or provider default.
• clearPromotedDraftThreads now only removes thread registration mappings, preserving draft content when a thread is promoted.
• Behavioral Change: drafts that have only null-valued settings fields are eligible for removal; previously false for fast mode was not persisted.

^{Macroscope summarized 274babf.}

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[juliusmarminge]

should behave similar to the draft state for model selected

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

[maskdotdev]

Alright I think this is the proper behavior that should behave similar to the draft state for model selected

t3code-persist-thinking.mp4