docs: add budget app implementation plan

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25 TDD tasks across five phases: foundation, pure domain core, IndexedDB
persistence, JSON/ODS export, UI, and shipping (PWA + Docker + CI).

Self-review caught five defects, fixed inline:
- distributeByWeight divided by zero on all-zero weights, which a
  zero-total purchase reaches and which would take the whole fold down
- summaryView's fold binding needed an explicit type or CI typecheck fails
- a duplicated module import in registerSw.ts
- a shell render test that would break once its routes read the store,
  since happy-dom has no IndexedDB
- an unreadable assertion in the ODS numeric-cell test

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

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Lucas WintherandClaude Opus 5 committed 2026-09-01 16:13:40 +02:00

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docs/superpowers/plans/2026-09-01-budget-app.md

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