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Marc-André Bombeck
96076dbc33
v1.4.25 W7 phase 3.1 — closes the export half of issue #167. CSV/JSON exports previously emitted timestamps via .toISOString(), producing 2026-05-15T09:00:00.000Z. Excel and LibreOffice drop the trailing Z silently and render the bare datetime in the viewer's locale, so a Warsaw user reads UTC as local time — 11:00 entries display as 09:00 in their spreadsheet. Export helpers now accept an optional userTz argument and emit ISO-8601 with the user's UTC offset (2026-05-15T11:00:00+02:00). The offset survives the round-trip and the on-screen value is unambiguous regardless of the spreadsheet's defaults. Routes resolve the user's stored timezone via the v1.4.25 W7 phase 2 resolver and thread it through formatMeasurements / formatIntakeEvents / formatMoodEntries. Backward-compatible: userTz is optional. When omitted (admin tools, canonical-backup-on-disk shape) the helpers fall back to .toISOString(), keeping the legacy contract for the JSON full-backup route that the upload-restore validator depends on. Surfaces touched: - src/lib/export.ts (3 formatters + helper) - src/app/api/export/measurements/route.ts - src/app/api/export/medications/route.ts (intake history block) - src/app/api/export/mood/route.ts - src/app/api/export/route.ts (legacy aggregate route) Tests: 5 new cases in src/lib/__tests__/export.test.ts covering Berlin / Auckland / New_York offsets, the no-userTz fallback, and the mood-entry case where the stored YYYY-MM-DD date column stays unchanged (see proposal §6.3 for the read-side rationale).