feat: add occurrence-aware appointment search

src/main.cpp

@@ -151,6 +151,11 @@ int print_frame(std::span<const nocal::Event> events, bool no_color)
         .focused_event_id = std::nullopt,
         .show_event_details = false,
         .confirm_delete = false,
+        .search_prompt = false,
+        .show_search_results = false,
+        .search_query = {},
+        .search_results = {},
+        .search_result_index = 0,
         .notification = {},
         .notification_is_error = false,
     };