fix(menu): drop the Whitebox section label, title-case "Whitebox Toolbox"

The toolbox item alone heads the catalog categories; the extra muted label
above it was redundant with it. The separator before the GeoLibre submenu
stays, so the two sections still read as separate owners.

"Whitebox Toolbox" matches the title case of the sibling menu items (SQL
Workspace, Python Console, Jupyter Notebook). Retitling the shared
processing.whitebox.toolbox string rather than adding a menu-only key keeps
the item translated in all 19 locales; it also titles the toolbox dialog, so
that heading picks up the same casing in English.

Author: giswqs

apps/geolibre-desktop/src/components/layout/toolbar/ProcessingMenu.tsx

@@ -140,22 +140,16 @@ export function ProcessingMenu({
             <DropdownMenuSeparator />
           </>
         )}
-        {/* Section header for the toolbox block below. Without it nothing in
-            the menu says the nine category submenus belong to the Whitebox
-            toolbox — they render as bare siblings of the GeoLibre submenu, so
-            "Conversion" (toolbox) and "GeoLibre → Conversion" (app dialog) look
-            like peers (GeoLibre#1904). A label, not a parent submenu: the
-            grouping is worth one muted line, not an extra hover on the way to
-            every tool. */}
+        {/* Heads the toolbox block below: the nine category submenus render as
+            bare siblings of the GeoLibre submenu, so "Conversion" (toolbox) and
+            "GeoLibre → Conversion" (app dialog) otherwise look like peers
+            (GeoLibre#1904). Names the toolbox rather than repeating the bare
+            product name, and says what clicking it does. Reuses the dialog's
+            own heading string, which is already translated in every locale. */}
         {showWhitebox && (
-          <>
-            <DropdownMenuLabel className="text-xs text-muted-foreground">
-              {t("toolbar.item.whitebox")}
-            </DropdownMenuLabel>
-            <DropdownMenuItem onSelect={() => setProcessingOpen(true)}>
-              {t("processing.whitebox.toolbox")}
-            </DropdownMenuItem>
-          </>
+          <DropdownMenuItem onSelect={() => setProcessingOpen(true)}>
+            {t("processing.whitebox.toolbox")}
+          </DropdownMenuItem>
         )}
         {/* Whitebox tools grouped by category/subcategory. Each leaf opens the
             Whitebox toolbox dialog preselected to that tool. Catalog data lives

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

@@ -4073,7 +4073,7 @@
       "allSources": "All sources",
       "geolibreTools": "GeoLibre tools",
       "whiteboxTools": "Whitebox tools",
-      "toolbox": "Whitebox toolbox",
+      "toolbox": "Whitebox Toolbox",
       "checkingRuntime": "Checking runtime.",
       "toolsAvailable_one": "{{count}} tool available.",
       "toolsAvailable_other": "{{count}} tools available.",