src/components/CalendarHeader.vue

@@ -24,9 +24,12 @@ const topVirtualWeek = computed(() => {
 })
 
 const currentYear = computed(() => {
-  const firstDay = new Date(baseDate)
-  firstDay.setDate(firstDay.getDate() + topVirtualWeek.value * 7)
-  return isoWeekInfo(firstDay).year
+  const weekStart = new Date(baseDate)
+  weekStart.setDate(weekStart.getDate() + topVirtualWeek.value * 7)
+  // ISO anchor: Thursday of current calendar week
+  const anchor = new Date(weekStart)
+  anchor.setDate(anchor.getDate() + ((4 - anchor.getDay() + 7) % 7))
+  return isoWeekInfo(anchor).year
 })
 
 function virtualWeekOf(d) {
@@ -36,30 +39,41 @@ function virtualWeekOf(d) {
   return Math.floor((fd - baseDate) / WEEK_MS)
 }
 
+function isoWeekMonday(isoYear, isoWeek) {
+  // Monday of ISO week 1
+  const jan4 = new Date(isoYear, 0, 4)
+  const week1Mon = new Date(jan4)
+  week1Mon.setDate(week1Mon.getDate() - ((week1Mon.getDay() + 6) % 7))
+  const target = new Date(week1Mon)
+  target.setDate(target.getDate() + (isoWeek - 1) * 7)
+  return target
+}
+
 function changeYear(y) {
   if (y == null) return
   y = Math.round(Math.max(calendarStore.minYear, Math.min(calendarStore.maxYear, y)))
   if (y === currentYear.value) return
-  // Current ISO week + intra-week fraction
   const vw = topVirtualWeek.value
+  // Fraction within current row for smooth vertical position preservation
   const weekStartScroll = (vw - props.minVirtualWeek) * props.rowHeight
   const frac = Math.max(0, Math.min(1, (props.scrollTop - weekStartScroll) / props.rowHeight))
-  const weekStart = new Date(baseDate)
-  weekStart.setDate(weekStart.getDate() + vw * 7)
-  let { week: isoW } = isoWeekInfo(weekStart)
-  // Build Monday of isoW in target year (Jan 4 trick)
-  const jan4 = new Date(y, 0, 4)
-  const jan4Mon = new Date(jan4)
-  jan4Mon.setDate(jan4.getDate() - ((jan4.getDay() || 7) - 1)) // Monday of week 1
-  let monday = new Date(jan4Mon)
-  monday.setDate(monday.getDate() + (isoW - 1) * 7)
-  // If overflow (week 53 not present) step back
-  if (isoWeekInfo(monday).year !== y) {
-    monday.setDate(monday.getDate() - 7)
+  // Derive current ISO week via anchor Thursday
+  const curCalWeekStart = new Date(baseDate)
+  curCalWeekStart.setDate(curCalWeekStart.getDate() + vw * 7)
+  const curAnchorThu = new Date(curCalWeekStart)
+  curAnchorThu.setDate(curAnchorThu.getDate() + ((4 - curAnchorThu.getDay() + 7) % 7))
+  let { week: isoW } = isoWeekInfo(curAnchorThu)
+  // Build Monday of that ISO week in target year; fallback if week absent (53)
+  let weekMon = isoWeekMonday(y, isoW)
+  if (isoWeekInfo(weekMon).year !== y) {
+    isoW--
+    weekMon = isoWeekMonday(y, isoW)
   }
-  const shift = (monday.getDay() - calendarStore.config.first_day + 7) % 7
-  monday.setDate(monday.getDate() - shift)
-  const targetVW = virtualWeekOf(monday)
+  // Align to configured first day
+  const shift = (weekMon.getDay() - calendarStore.config.first_day + 7) % 7
+  const calWeekStart = new Date(weekMon)
+  calWeekStart.setDate(calWeekStart.getDate() - shift)
+  const targetVW = virtualWeekOf(calWeekStart)
   let scrollTop = (targetVW - props.minVirtualWeek) * props.rowHeight + frac * props.rowHeight
   if (Math.abs(scrollTop - props.scrollTop) < 0.5) scrollTop += 0.25 * props.rowHeight
   emit('year-change', { year: y, scrollTop })

src/components/CalendarView.vue

@@ -130,7 +130,10 @@ function getFirstDayForVirtualWeek(virtualWeek) {
 
 function createWeek(virtualWeek) {
   const firstDay = getFirstDayForVirtualWeek(virtualWeek)
-  const weekNumber = isoWeekInfo(firstDay).week
+  // ISO week number should be based on the Thursday of this week (anchor) to avoid off-by-one when week starts Sunday or other days
+  const isoAnchor = new Date(firstDay)
+  isoAnchor.setDate(isoAnchor.getDate() + ((4 - isoAnchor.getDay() + 7) % 7))
+  const weekNumber = isoWeekInfo(isoAnchor).week
   const days = []
   const cur = new Date(firstDay)
   let hasFirst = false

src/components/Numeric.vue

@@ -12,7 +12,7 @@
     tabindex="0"
     @pointerdown="onPointerDown"
     @keydown="onKey"
-  @wheel.prevent="onWheel"
+    @wheel.prevent="onWheel"
   >
     <span class="value" :title="String(current)">{{ display }}</span>
   </div>
@@ -246,16 +246,17 @@ function onWheel(e) {
   justify-content: center;
   padding: 0 0.4rem;
   gap: 0.25rem;
-  border: 1px solid var(--input-border, var(--muted));
-  background: var(--panel-alt);
+  border: 1px solid transparent;
+  background: transparent;
   border-radius: 0.4rem;
   min-height: 1.8rem;
   font-variant-numeric: tabular-nums;
-  touch-action: none; /* allow custom drag without scrolling */
+  touch-action: none;
 }
 .mini-stepper.drag-mode:focus-visible {
-  outline: 2px solid var(--input-focus, #2563eb);
-  outline-offset: 2px;
+  border-color: var(--input-border, var(--muted));
+  box-shadow: 0 0 0 2px var(--input-focus, #2563eb);
+  outline: none;
 }
 .mini-stepper.drag-mode .value {
   font-weight: 600;