fix: restore resolution-specific date windows in SEO export script

scripts/export_seo_metadata.R

@@ -150,11 +150,16 @@ for (rc in resolution_config) {
         state_counts[[state_key]]$stationCount <-
             state_counts[[state_key]]$stationCount + 1L
             
-        # Determine the UI's default date range
-        # Must match global.R: default_start_date <- default_end_date - (365 * 6)
-        # The Shiny app always starts with this 6-year window regardless of resolution.
-        # Resolution-specific adjustments only happen after user interaction.
-        default_start_date <- Sys.Date() - (365 * 6)
+        # Determine the UI's default date range start for this resolution
+        # Must match server.R URL param handler for initial load
+        default_start_date <- switch(rc$key,
+            "10_minutes" = Sys.Date() - 30,
+            "hourly"     = Sys.Date() - 366,
+            "monthly"    = Sys.Date() - (365 * 6),
+            "daily"      = Sys.Date() - (365 * 6),
+            "annual"     = as.Date("1991-01-01"),
+            Sys.Date() - (365 * 6)
+        )
         default_start_num <- as.numeric(format(default_start_date, "%Y%m%d"))
         default_end_num <- as.numeric(format(Sys.Date(), "%Y%m%d"))