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Jean-Luc Makiola 1b0b4d0368 docs(07-01): complete weight unit core plan

- SUMMARY.md with TDD results and 21-test coverage
- STATE.md updated to Plan 2 of 2, 17% progress
- ROADMAP.md marks 07-01 complete (1/2 plans)
- REQUIREMENTS.md marks UNIT-02, UNIT-03 complete

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

2026-03-16 12:19:10 +01:00

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Phase 7 Plan 01: Weight Unit Core Summary

Parameterized formatWeight with g/oz/lb/kg conversion and useWeightUnit settings hook, backed by 21 TDD tests

Performance

Duration: 2 min
Started: 2026-03-16T11:14:19Z
Completed: 2026-03-16T11:16:30Z
Tasks: 2
Files modified: 3

Accomplishments

TDD-developed formatWeight function supporting 4 weight units (g, oz, lb, kg) with appropriate precision
WeightUnit type exported for consumption by all display components in Plan 02
useWeightUnit convenience hook with validation and "g" default, ready for component integration
Full backward compatibility preserved -- formatWeight(grams) still returns "Xg" as before

Task Commits

Each task was committed atomically:

Task 1 (RED): TDD formatWeight tests - 431c179 (test)
Task 1 (GREEN): Implement formatWeight with unit parameter - 6cac0a3 (feat)
Task 2: Create useWeightUnit convenience hook - ada3791 (feat)

TDD task had 2 commits (test -> feat). No refactor needed -- code was already minimal.

Files Created/Modified

src/client/lib/formatters.ts - Added WeightUnit type, conversion constants, switch-based unit formatting
src/client/hooks/useWeightUnit.ts - Convenience hook wrapping useSetting("weightUnit") with typed validation
tests/lib/formatters.test.ts - 21 tests covering all units, null/undefined, backward compat, edge cases

Decisions Made

Conversion precision follows common usage: grams rounded (0dp), ounces 1dp, pounds 2dp, kilograms 2dp
useWeightUnit validates stored value against a whitelist of known units, protecting against corrupt settings data
Conversion constants (GRAMS_PER_OZ=28.3495, GRAMS_PER_LB=453.592, GRAMS_PER_KG=1000) kept as module-level consts, not exported

Deviations from Plan

Auto-fixed Issues

1. [Rule 1 - Bug] Fixed import order in useWeightUnit.ts

Found during: Task 2 (useWeightUnit hook creation)
Issue: Biome lint required imports sorted alphabetically (type imports before value imports)
Fix: Reordered imports to put import type { WeightUnit } before import { useSetting }
Files modified: src/client/hooks/useWeightUnit.ts
Verification: bun run lint passes clean
Committed in: ada3791 (Task 2 commit)

Total deviations: 1 auto-fixed (1 bug - lint order) Impact on plan: Trivial formatting fix. No scope creep.

Issues Encountered

None

User Setup Required

None - no external service configuration required.

Next Phase Readiness

WeightUnit type and formatWeight function ready for Plan 02 to wire into all weight-displaying components
useWeightUnit hook ready for components to consume the user's preferred unit from settings
All 108 existing tests pass (full suite regression check confirmed)

Self-Check: PASSED

All files exist, all commits found, all exports verified.

Phase: 07-weight-unit-selection Completed: 2026-03-16

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