compact calendar now

ht_booking/src/controllers/calendar.rs

@@ -64,6 +64,9 @@ pub struct Cell {
 pub struct Row {
     pub hour_label: String,
     pub cells: Vec<Cell>,
+    /// Public view only: `true` when this row collapses a run of fully-free
+    /// hours into one compact strip. The admin grid never sets it.
+    pub free_group: bool,
 }
 
 #[derive(Debug, Serialize)]
@@ -107,6 +110,46 @@ fn week_monday(week: Option<&str>) -> NaiveDate {
     monday_of(base)
 }
 
+/// Collapses runs of fully-free hour rows into one compact strip so a court
+/// that isn't booked solid doesn't waste vertical space. Rows holding at
+/// least one booking are kept full-size so bookings stay easy to read.
+/// Public calendar only — the admin grid always shows every hour.
+fn group_free_rows(rows: Vec<Row>) -> Vec<Row> {
+    let mut out: Vec<Row> = Vec::new();
+    let mut run: Vec<Row> = Vec::new();
+    for row in rows {
+        if row.cells.iter().all(|c| !c.booked) {
+            run.push(row);
+        } else {
+            flush_free_run(&mut run, &mut out);
+            out.push(row);
+        }
+    }
+    flush_free_run(&mut run, &mut out);
+    out
+}
+
+/// Drains a pending run of free rows into `out` as a single collapsed row.
+fn flush_free_run(run: &mut Vec<Row>, out: &mut Vec<Row>) {
+    if run.is_empty() {
+        return;
+    }
+    let hour_of = |r: &Row| r.cells.first().map_or(FIRST_HOUR, |c| c.hour);
+    let first = run.first().map_or(FIRST_HOUR, hour_of);
+    let last = run.last().map_or(first, hour_of);
+    let hour_label = if run.len() > 1 {
+        format!("{first:02}:00 – {:02}:00", last + 1)
+    } else {
+        format!("{first:02}:00")
+    };
+    out.push(Row {
+        hour_label,
+        cells: Vec::new(),
+        free_group: true,
+    });
+    run.clear();
+}
+
 /// Builds the calendar grid for the selected court and week.
 pub async fn build_calendar(
     ctx: &AppContext,
@@ -201,10 +244,15 @@ pub async fn build_calendar(
             Row {
                 hour_label: format!("{hour:02}:00"),
                 cells,
+                free_group: false,
             }
         })
         .collect();
 
+    // The public calendar collapses empty stretches to stay compact; the admin
+    // grid always shows every hour so each slot stays individually editable.
+    let rows = if is_admin { rows } else { group_free_rows(rows) };
+
     Ok(CalendarPage {
         lang: lang.to_string(),
         is_admin,