improve swithching resoltuion conrtls

server.R

@@ -42,6 +42,14 @@ server <- function(input, output, session) {
     previous_date_range <- reactiveVal(NULL) # Track previous date range for bi-directional sync
 
     # --- Reactive Data Sources (Resolution Dependent) ---
+    observeEvent(input$data_resolution,
+        {
+            session$sendCustomMessage("freezeUI", list(text = "Switching resolution..."))
+        },
+        priority = 1000,
+        ignoreInit = TRUE
+    )
+
     current_index <- reactive({
         req(input$data_resolution)
         # Identify resolution (default hourly)
@@ -272,6 +280,9 @@ server <- function(input, output, session) {
                     options = pathOptions(pane = "markersPane")
                 )
         }
+
+        # Unfreeze after markers are updated
+        session$sendCustomMessage("unfreezeUI", list())
     })
 
     # --- Selection Logic ---