Address Claude review feedback

- Rename i18n key addData.shared.insertBefore -> insertBelow so the key name
  matches its "Insert below" value and stays self-documenting for translators.
  Updated both call sites (shared InsertBeforeField and StylePanel).

Author: giswqs

apps/geolibre-desktop/src/components/layout/add-data/shared.tsx

@@ -173,7 +173,7 @@ export function InsertBeforeField({
   return (
     <div className="space-y-1.5">
       <Label htmlFor="add-data-before-id">
-        {t("addData.shared.insertBefore")}
+        {t("addData.shared.insertBelow")}
       </Label>
       <Select
         id="add-data-before-id"

apps/geolibre-desktop/src/components/panels/StylePanel.tsx

@@ -1635,7 +1635,7 @@ export function StylePanel({
     showBasemapStyleLayers || valueIsBasemapStyleLayer;
   const beforeIdControl = (
     <div className="space-y-2">
-      <Label htmlFor="beforeId">{t("addData.shared.insertBefore")}</Label>
+      <Label htmlFor="beforeId">{t("addData.shared.insertBelow")}</Label>
       <Select
         id="beforeId"
         value={draftBeforeId}

apps/geolibre-desktop/src/i18n/locales/en.json

@@ -157,7 +157,7 @@
     },
     "shared": {
       "layerName": "Layer name",
-      "insertBefore": "Insert below",
+      "insertBelow": "Insert below",
       "insertTop": "Top of layer list (default)",
       "layersGroup": "Layers",
       "basemapLayersGroup": "Basemap layers",