Fix: Avoid unstable React keys in step rendering

[FL4TLiN3]

Summary

• Remove content from React keys in step rendering to prevent key collisions when identical content appears in multiple lines
• Keys now use only index (e.g., todo-${idx} instead of todo-${idx}-${todo})
• Affected components: todo preview, exec output, readTextFile, writeTextFile, editTextFile, appendTextFile, listDirectory

Test plan

• pnpm typecheck passes
• pnpm test passes
• pnpm format-and-lint passes
• pnpm build passes

Closes #28

---

Note

Use index-only React keys across step renderers to avoid unstable keys when content repeats.

• TUI:
  • Stabilize React list keys in packages/tui/src/components/step.tsx:
    • Replace content-derived keys with index-only keys across renders: todo (added/completed), exec output, readTextFile, writeTextFile, editTextFile (old/new), appendTextFile, listDirectory.

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Project	Deployment	Preview	Comments	Updated (UTC)
perstack	Ready	Preview	Comment	Dec 4, 2025 4:04am

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✅ All modified and coverable lines are covered by tests.

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