fix(vacay): reset selectedYear when the active year is deleted

When deleting the currently selected year, selectedYear was never
cleared, leaving the deleted year shown as active in the UI. Now
resets to the latest remaining year, or the current calendar year
if all years have been removed.

Fixes #369

client/src/store/vacayStore.ts

@@ -222,7 +222,13 @@ export const useVacayStore = create<VacayState>((set, get) => ({
 
   removeYear: async (year: number) => {
     const data = await api.removeYear(year)
-    set({ years: data.years })
+    const updates: Partial<VacayState> = { years: data.years }
+    if (get().selectedYear === year) {
+      updates.selectedYear = data.years.length > 0
+        ? data.years[data.years.length - 1]
+        : new Date().getFullYear()
+    }
+    set(updates)
   },
 
   loadEntries: async (year?: number) => {