Pin File Handling open at end of Browser Feature menu

Move File Handling to the last position in the Browser Feature group
and drop its collapsed flag so the XLSX subentry is always visible
and the group can no longer be collapsed.

Author: claude

docs/.vitepress/config.mjs

@@ -208,16 +208,15 @@ export default defineConfig({
                 text: "Geolocation, Map",
                 link: "/development/specific/geolocation",
               },
+              { text: "Timer", link: "/development/specific/timer" },
+              { text: "Soft Keyboard", link: "/development/specific/soft_keyboard" },
               {
                 text: "File Handling",
                 link: "/development/specific/files",
-                collapsed: true,
                 items: [
                   { text: "XLSX", link: "/development/specific/xlsx" },
                 ],
               },
-              { text: "Timer", link: "/development/specific/timer" },
-              { text: "Soft Keyboard", link: "/development/specific/soft_keyboard" },
             ],
           },
           {