feat: implement database-driven undo/redo stack

Summary

Imported from GitHub PR #30.

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  "url": "https://github.com/The-Connell-School/yawp-2.0/pull/30",
  "repo": "The-Connell-School/yawp-2.0",
  "draft": false,
  "state": "CLOSED",
  "title": "feat: implement database-driven undo/redo stack",
  "branch": "claude/issue-29-20250710_011017",
  "checks": {
    "total": 1,
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  "number": 30,
  "syncedAt": "2026-05-26T21:38:23.523Z",
  "mergeable": "DIRTY"
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