New device-local setting "Monatsansicht seitenweise wischen" (SettingsStore,
no server sync). When off, the month view stays the continuous vertical scroll
feed. When on, it becomes a HorizontalPager — one month per screen, six
height-filling week rows, swipe left/right to change month. The prev/next/today
signals route to the pager (animateScrollToPage) instead of the list, and the
visible month is derived from pagerState.currentPage. WeekRow now takes a
rowModifier so the same row renders at a fixed height (scroll) or weight(1f)
(paged). Setting is re-read when the settings screen closes.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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