refactor: code clean up

Signed-off-by: Sebastian Krupinski <krupinski01@gmail.com>

src/types/index.ts

@@ -7,12 +7,6 @@
 // Local UI-specific types
 export type CalendarView = 'days' | 'month' | 'agenda';
 
-/** Half-open local calendar range: [startMs, endMs). */
-export interface VisibleDateRange {
-  startMs: number;
-  endMs: number;
-}
-
 export interface ViewState {
   currentView: CalendarView;
   currentDate: Date;