Swipe the calendar sideways to step a day or a month

The calendar had next and previous as toolbar buttons and n/p, and nothing
for a thumb. Every other surface in the app that a finger drives already
answers to a swipe.

Day and month only. Those are the two views where a period is a page;
week and agenda scroll through a range rather than turning to the next
one, so there is nothing a sideways flick would obviously mean. Dragging
left pulls the next period in from the right, the way paper and every
phone do it.

Three things it deliberately does not do.

It draws nothing while the finger moves. The row swipe slides the row open
because the strip underneath has to name which of six actions is about to
happen; stepping a calendar has two outcomes and the direction of the
finger already says which. Translating the grid would also break the
sticky day header, since a transform makes a containing block. The
threshold is reported by the vibration motor instead, which is what the
haptics are for.

It does not start on an event. Which gesture was meant is decidable at the
moment the finger lands and only then, so dragging an event stays
available to be built later without having to be untangled from this
first.

And it asks for a longer drag than a row swipe -- not because the
consequence is bigger, since stepping back undoes it while a swiped row
has already been archived, but because this gesture has no way to change
its mind. A row reveals what it will do and can be let go early, and
offers Undo after. This shows nothing and offers nothing, so the distance
is the only chance to not mean it.

The axis lock is the shared one, keeping its bias towards the vertical:
the day grid scrolls through the hours, and a scroll misread as a swipe
throws the reader into another day. The toolbar buttons and n/p stay,
because a gesture with no visible control is one only the people who
already know about it can use.

web/src/views/calendar/CalendarView.tsx

@@ -4,9 +4,10 @@ import { ChevronLeft, ChevronRight, Plus, Calendar as CalIcon } from "lucide-rea
 import { useCalendar, participantAddresses, type EventInstance } from "@/store/calendar";
 import { useSettings } from "@/store/settings";
 import { addDays, addMonths, DAY_MS, endOfDay, isSameDay, isToday, monthGrid, roundToNext, startOfDay, startOfWeek, toLocalDateOnly, weekDays } from "@/lib/dates";
+import { useSwipeNav } from "@/lib/touch";
 import { formatMonthYear, formatTime } from "@/lib/format";
 import { formatDate, formatDateLong, formatDayMonth, formatHourLabel, formatWeekday, formatWeekdayDate } from "@/lib/datetime";
-import { Empty, useIsMobile } from "@/ui/misc";
+import { Empty, useIsMobile, useIsTouch } from "@/ui/misc";
 import { keyboard } from "@/lib/keyboard";
 import { EventPopover } from "./EventPopover";
 import { EventEditor, type EditorInit } from "./EventEditor";
@@ -90,6 +91,25 @@ export function CalendarView({ view: viewParam, date }: { view?: string; date?:
     else go(view, addDays(anchor, 30 * n));
   };
 
+  /*
+   * Swipe sideways to step the calendar, on a touchscreen only and only in the
+   * two views where a period is a page: day and month. Week and agenda scroll
+   * through a range rather than turning to the next one, so there is nothing a
+   * sideways flick would obviously mean.
+   *
+   * The buttons in the toolbar stay, and so does n/p. A gesture with no
+   * visible control is one only the people who already know about it can use.
+   */
+  const [mainEl, setMainEl] = useState<HTMLDivElement | null>(null);
+  const isTouch = useIsTouch();
+  useSwipeNav(mainEl, {
+    enabled: isTouch && (effectiveView === "day" || effectiveView === "month"),
+    onStep: (n) => step(n),
+    // Buttons live in the toolbar; an event is where a future drag-to-move
+    // gesture has to start, so this one keeps out of both.
+    ignore: ".cal-toolbar, .ev-chip, .ev-block, .agenda-ev",
+  });
+
   const openNew = useCallback(
     (start?: Date, end?: Date, allDay = false) => {
       const s = start ?? roundToNext(new Date(), 30);
@@ -147,7 +167,7 @@ export function CalendarView({ view: viewParam, date }: { view?: string; date?:
   };
 
   return (
-    <div className="cal-main">
+    <div className="cal-main" ref={setMainEl}>
       <div className="cal-toolbar">
         <button className="btn btn-sm" onClick={() => go(view, new Date())}>{translate("Today")}</button>
         <button className="icon-btn sm" onClick={() => step(-1)} aria-label={translate("Previous")}><ChevronLeft size={18} /></button>