A whole lot of stuff

lib/services/fuel_report.dart

@@ -106,6 +106,18 @@ class FuelReport {
   }
 }
 
+/// The date range the Reports tab defaults to on open: a year-long window
+/// from July 1 through the following June 30, matching how Missouri's
+/// fuel tax refund periods run. Which specific year that window falls in
+/// rolls over on August 1: from August of year Y through July of year
+/// Y+1, this stays July Y–June (Y+1) throughout — the most recently
+/// completed (or currently running) period — rather than jumping to a
+/// brand new, still-empty one the moment August 1 hits.
+(DateTime start, DateTime end) defaultReportDateRange(DateTime now) {
+  final fiscalStartYear = now.month >= 8 ? now.year : now.year - 1;
+  return (DateTime(fiscalStartYear, 7, 1), DateTime(fiscalStartYear + 1, 6, 30));
+}
+
 /// Builds a per-vehicle fuel summary for [startDate]–[endDate] (inclusive,
 /// judged by each entry's purchase date, in local time), restricted to
 /// entries that actually have a receipt attached — a report meant to