mobile resolution

ht_booking/src/controllers/calendar.rs

@@ -89,6 +89,9 @@ pub struct CalendarPage {
     /// `false` on the public calendar once it reaches the two-week look-back
     /// limit, which disables the "previous week" button. Always `true` for admin.
     pub can_prev: bool,
+    /// Index (0–6, Mon–Sun) of the day shown first in the mobile single-day
+    /// view — today when the displayed week contains it, otherwise Monday.
+    pub mobile_day: i64,
     pub days: Vec<DayHead>,
     pub rows: Vec<Row>,
 }
@@ -193,6 +196,9 @@ pub async fn build_calendar(
     let min_monday = monday_of(Utc::now().date_naive()) - Duration::weeks(2);
     let monday = if is_admin { monday } else { monday.max(min_monday) };
     let can_prev = is_admin || monday > min_monday;
+    // Mobile single-day view opens on today when it falls in the shown week.
+    let day_offset = (Utc::now().date_naive() - monday).num_days();
+    let mobile_day = if (0..7).contains(&day_offset) { day_offset } else { 0 };
     let sunday = monday + Duration::days(6);
 
     let days: Vec<DayHead> = (0..7i64)
@@ -278,6 +284,7 @@ pub async fn build_calendar(
             .to_string(),
         next_week: (monday + Duration::days(7)).format("%Y-%m-%d").to_string(),
         can_prev,
+        mobile_day,
         days,
         rows,
     })