fix sidebar loading issues and navbar on mobile (#7991)

* Refactor MobileSidebar to manage script and category selection based on current pathname. Introduced temporary state for non-scripts pages and updated logic for last viewed script handling. Improved accessibility by ensuring proper aria attributes and class management.

* Update API endpoint paths in data.ts to include ProxmoxVE prefix for category and version fetching functions.

* Refactor Navbar component layout for improved structure and responsiveness. Adjusted flex properties to ensure proper alignment of elements, enhancing the mobile and desktop user experience. Updated accessibility features and ensured consistent use of TailwindCSS classes.

frontend/src/components/navigation/mobile-sidebar.tsx

@@ -1,6 +1,7 @@
 "use client";
 
 import { useCallback, useEffect, useState } from "react";
+import { usePathname } from "next/navigation";
 import { useQueryState } from "nuqs";
 import { Menu } from "lucide-react";
 
@@ -18,9 +19,20 @@ function MobileSidebar() {
   const [isLoading, setIsLoading] = useState(false);
   const [categories, setCategories] = useState<Category[]>([]);
   const [lastViewedScript, setLastViewedScript] = useState<Script | undefined>(undefined);
+  const pathname = usePathname();
+
+  // Always call the hooks (React hooks can't be conditional)
   const [selectedScript, setSelectedScript] = useQueryState("id");
   const [selectedCategory, setSelectedCategory] = useQueryState("category");
 
+  // For non-scripts pages, we'll manage state locally
+  const [tempSelectedScript, setTempSelectedScript] = useState<string | null>(null);
+  const [tempSelectedCategory, setTempSelectedCategory] = useState<string | null>(null);
+
+  const isOnScriptsPage = pathname === "/scripts";
+  const currentSelectedScript = isOnScriptsPage ? selectedScript : tempSelectedScript;
+  const currentSelectedCategory = isOnScriptsPage ? selectedCategory : tempSelectedCategory;
+
   const loadCategories = useCallback(async () => {
     setIsLoading(true);
     try {
@@ -40,16 +52,16 @@ function MobileSidebar() {
   }, [loadCategories]);
 
   useEffect(() => {
-    if (!selectedScript || categories.length === 0) {
+    if (!currentSelectedScript || categories.length === 0) {
       return;
     }
 
     const scriptMatch = categories
       .flatMap(category => category.scripts)
-      .find(script => script.slug === selectedScript);
+      .find(script => script.slug === currentSelectedScript);
 
     setLastViewedScript(scriptMatch);
-  }, [selectedScript, categories]);
+  }, [currentSelectedScript, categories]);
 
   const handleOpenChange = (openState: boolean) => {
     setIsOpen(openState);
@@ -78,7 +90,9 @@ function MobileSidebar() {
           <Menu className="size-5" aria-hidden="true" />
         </Button>
       </SheetTrigger>
-      <SheetHeader className="border-b border-border px-6 pb-4 pt-2"><SheetTitle className="sr-only">Categories</SheetTitle></SheetHeader>
+      <SheetHeader className="border-b border-border px-6 pb-4 pt-2 sr-only">
+        <SheetTitle className="sr-only">Categories</SheetTitle>
+      </SheetHeader>
       <SheetContent side="left" className="flex w-full max-w-xs flex-col gap-4 overflow-hidden px-0 pb-6">
         <div className="flex h-full flex-col gap-4 overflow-y-auto">
           {isLoading && !hasLinks
@@ -91,19 +105,22 @@ function MobileSidebar() {
                 <div className="flex flex-col gap-4 px-4">
                   <Sidebar
                     items={categories}
-                    selectedScript={selectedScript}
-                    setSelectedScript={setSelectedScript}
-                    selectedCategory={selectedCategory}
-                    setSelectedCategory={setSelectedCategory}
+                    selectedScript={currentSelectedScript}
+                    setSelectedScript={isOnScriptsPage ? setSelectedScript : setTempSelectedScript}
+                    selectedCategory={currentSelectedCategory}
+                    setSelectedCategory={isOnScriptsPage ? setSelectedCategory : setTempSelectedCategory}
                     onItemSelect={handleItemSelect}
                   />
                 </div>
               )}
-          {selectedScript && lastViewedScript
+          {currentSelectedScript && lastViewedScript
             ? (
                 <div className="flex flex-col gap-3 px-4">
                   <p className="text-sm font-medium">Last Viewed</p>
-                  <ScriptItem item={lastViewedScript} setSelectedScript={setSelectedScript} />
+                  <ScriptItem
+                    item={lastViewedScript}
+                    setSelectedScript={isOnScriptsPage ? setSelectedScript : setTempSelectedScript}
+                  />
                 </div>
               )
             : null}