refactor: remove inline selected station styling from main layer and add post-render re-highlight.

server.R

@@ -755,21 +755,14 @@ server <- function(input, output, session) {
         )
 
         if (nrow(df) > 0) {
-            # Add styling columns for selected vs non-selected
-            # Use isolate to avoid redrawing all stations when selection changes
-            # (the highlight layer handles selected station visualization)
-            selected_id <- isolate(current_station_id())
-            is_selected_vec <- if (!is.null(selected_id)) (df$id == selected_id) else rep(FALSE, nrow(df))
-
+            # Standard styling for all stations (selection is handled by separate highlight layer)
             df <- df %>%
                 mutate(
                     circle_color = "navy",
-                    circle_radius = ifelse(is_selected_vec, 10, 6),
-                    circle_stroke_color = ifelse(is_selected_vec, "#FF0000", "#00000000"),
-                    circle_stroke_width = ifelse(is_selected_vec, 3, 0),
-                    is_selected = ifelse(is_selected_vec, 1, 0)
-                ) %>%
-                arrange(is_selected)
+                    circle_radius = 6,
+                    circle_stroke_color = "#00000000",
+                    circle_stroke_width = 0
+                )
 
             # Convert to sf
             map_data <- st_as_sf(df, coords = c("longitude", "latitude"), crs = 4326)
@@ -788,6 +781,18 @@ server <- function(input, output, session) {
                     tooltip = get_column("popup_content"),
                     before_id = stations_before_id()
                 )
+
+            # Re-highlight selected station if present (to update label with new resolution)
+            sid <- isolate(current_station_id())
+            if (!is.null(sid)) {
+                sel_row <- df %>% filter(id == sid)
+                if (nrow(sel_row) > 0) {
+                    highlight_selected_station(maplibre_proxy("map"), sel_row$longitude[1], sel_row$latitude[1], sel_row$popup_content[1], move_map = FALSE)
+                } else {
+                    # Station no longer in filtered set, clear highlight
+                    maplibre_proxy("map") %>% clear_layer("selected-highlight")
+                }
+            }
         }
 
         # Unfreeze after markers are updated