feat : pagination des années + selectYear + recentrage (#date-year-picker)

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

app/components/malio/date/composables/useCalendarView.test.ts

@@ -1,5 +1,5 @@
 import {afterEach, beforeEach, describe, expect, it, vi} from 'vitest'
-import {ref} from 'vue'
+import {nextTick, ref} from 'vue'
 import {useCalendarView} from './useCalendarView'
 
 describe('useCalendarView', () => {
@@ -65,4 +65,27 @@ describe('useCalendarView', () => {
     expect(currentMonth.value).toBe(4)
     expect(currentYear.value).toBe(2026)
   })
+
+  it('paginates years by 12 in years view', () => {
+    const {yearPageStart, goToNext, goToPrev} = useCalendarView(ref('years'))
+    const start = yearPageStart.value
+    goToNext()
+    expect(yearPageStart.value).toBe(start + 12)
+    goToPrev()
+    expect(yearPageStart.value).toBe(start)
+  })
+
+  it('selectYear sets the current year', () => {
+    const {currentYear, selectYear} = useCalendarView(ref('days'))
+    selectYear(2030)
+    expect(currentYear.value).toBe(2030)
+  })
+
+  it('recenters the year page on entering years view (current - 5)', async () => {
+    const mode = ref<'days' | 'months' | 'years'>('days')
+    const {yearPageStart} = useCalendarView(mode)
+    mode.value = 'years'
+    await nextTick()
+    expect(yearPageStart.value).toBe(2021) // 2026 - 5
+  })
 })