feat: AI input history navigation with up/down arrow keys

[scriptease]

Summary

• Pressing ↑ at the beginning of the AI chat input cycles through previously sent messages (oldest → newest)
• Pressing ↓ walks forward through history, restoring your unsaved draft when you reach the end
• Works in both the main AI input and Group Chat input

Behavior

• History is per-session and in-memory (cleared on app restart)
• Capped at 100 entries; consecutive duplicate messages are skipped
• The current unsaved draft is preserved when navigation starts and restored on the way back down
• Terminal mode is unaffected — it retains its existing command history modal

Implementation

New useAIMessageHistory hook manages per-session history state via Map refs (no React state, no re-renders). Hooked into useInputProcessing to record messages at send time (AI mode only — wizard, queue, and direct send paths). Navigation is handled in useInputKeyDown for the main input and inline refs in GroupChatInput for group chat.

[coderabbitai]

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