Add 57 tests covering all data mutation paths
Refactor ShowBasedOnVoteLogics to accept injectable `now: Date` parameter
across all methods, enabling deterministic testing of voting date logic
without simulator clock manipulation.
Test coverage (55 new tests across 3 files):
- Pipeline 1: Streak calculation (7 tests) — consecutive, gaps, missing/placeholder exclusion
- Pipeline 2: Duplicate prevention (5 tests) — add replaces, removeDuplicates keeps best
- Pipeline 3: Fill missing dates (4 tests) — gap fill, idempotent, no overwrite
- Pipeline 4: Delete flows (5 tests) — clearDB, deleteLast, deleteAllEntries
- Pipeline 5: Update flows (5 tests) — mood, notes, photo set/clear
- Pipeline 6: Batch import (4 tests) — bulk insert, replace, dedup in batch
- Pipeline 7: Data listeners (3 tests) — fire on save, multiple listeners, refreshFromDisk
- Pipeline 8: Boundary edge cases (5 tests) — midnight, 23:59, day boundary leak
- Pipeline 9: Voting date logic (5 tests) — Today/Previous x before/after voting time
- Pipeline 10: Side effects orchestration (7 tests) — logMood, updateMood, deleteMood
- Pipeline 11: Full integration (5 tests) — streak grows/breaks/rebuilds, voting lifecycle
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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