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Marc-André Bombeck
f11df655a2
W4-ARCH-HYGIENE's 7-way dedup landed in `src/lib/tz/resolver.ts` but
left two more BERLIN_DAY_FORMATTER declarations alive:
- `src/lib/insights/bucket-series.ts` needed the numeric `{year,
month, day}` parts for `Date.UTC` arithmetic, so it kept its own
formatter and a local `toBerlinYmd` helper.
- `src/lib/analytics/bp-in-target.ts` used a separate en-CA formatter
to skip the part-reassembly when producing the YYYY-MM-DD string.
Export a sibling `toBerlinYmd(date)` helper from the resolver that
returns the formatter's raw string parts so `bucket-series.ts` can
parse them into numbers without instantiating a second formatter.
Switch `bp-in-target.ts` to the existing `toBerlinDayKey` import —
the en-CA shortcut is a microscopic speedup not worth the duplicate
formatter and the divergent contract.
Net: one shared formatter for every Berlin-anchored cache key in the
tree. The 272 insights / analytics / tz unit tests still pass.