feat: prompt history

[ignaciocervino]

Summary

• Persist per-thread prompt history to localStorage with a 200-item cap.
• Load history on thread/workspace switch and restore it after app restart.
• Migrate “default” history to the first real thread id so new threads keep history.

Simple Feature Explanation

• The up/down arrow history now survives app restarts and is remembered per thread.
• When you open a thread, you can recall its past prompts with ArrowUp/ArrowDown.

Limitations

• Per thread (and per workspace on Home), not global across all agents.
• Only saves text prompts that were sent/queued; attachments aren’t tracked.
• Max 200 entries per key; older entries are dropped.
• Navigation only works when the composer is empty and no attachments; disabled if autocomplete is open or modifier keys are held.

Screen.Recording.2026-01-27.at.01.42.44.mov

[Dimillian]

@codex review

[chatgpt-codex-connector]

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[Dimillian]

FYI: moving the history to be tied to workspace, so those can be reused across threads