feat: Add navigation labels and EmptyState component

Bottom Navigation:
- Added text labels under icons (Start, Sammlung, Filter, Profil)
- Elevated SCAN button with label
- Improved touch targets and visual hierarchy

EmptyState Component:
- Reusable component for empty lists
- Icon, title, description, optional CTA button
- Ready for use in SessionList, BuddyList, BottleGrid

src/components/BottomNavigation.tsx

@@ -12,6 +12,24 @@ interface BottomNavigationProps {
     onScan: (file: File) => void;
 }
 
+interface NavButtonProps {
+    onClick?: () => void;
+    icon: React.ReactNode;
+    label: string;
+    ariaLabel: string;
+}
+
+const NavButton = ({ onClick, icon, label, ariaLabel }: NavButtonProps) => (
+    <button
+        onClick={onClick}
+        className="flex flex-col items-center gap-0.5 px-3 py-1.5 text-zinc-400 hover:text-white transition-colors active:scale-95"
+        aria-label={ariaLabel}
+    >
+        {icon}
+        <span className="text-[9px] font-medium tracking-wide">{label}</span>
+    </button>
+);
+
 export const BottomNavigation = ({ onHome, onShelf, onSearch, onProfile, onScan }: BottomNavigationProps) => {
     const fileInputRef = React.useRef<HTMLInputElement>(null);
 
@@ -27,7 +45,7 @@ export const BottomNavigation = ({ onHome, onShelf, onSearch, onProfile, onScan
     };
 
     return (
-        <div className="fixed bottom-6 left-1/2 -translate-x-1/2 w-[90%] max-w-sm z-50 pointer-events-none">
+        <div className="fixed bottom-6 left-1/2 -translate-x-1/2 w-[95%] max-w-md z-50 pointer-events-none">
             {/* Hidden Input for Scanning */}
             <input
                 type="file"
@@ -37,49 +55,46 @@ export const BottomNavigation = ({ onHome, onShelf, onSearch, onProfile, onScan
                 className="hidden"
             />
 
-            <div className="flex items-center justify-between px-2 py-2 bg-zinc-900/90 backdrop-blur-lg border border-zinc-800 rounded-full shadow-2xl pointer-events-auto">
+            <div className="flex items-center justify-between px-1 py-1 bg-zinc-900/95 backdrop-blur-lg border border-zinc-800 rounded-full shadow-2xl pointer-events-auto">
                 {/* Left Items */}
-                <button
+                <NavButton
                     onClick={onHome}
-                    className="p-3 text-zinc-400 hover:text-white transition-colors active:scale-90"
-                    aria-label="Home"
-                >
-                    <Home size={22} strokeWidth={2.5} />
-                </button>
+                    icon={<Home size={20} strokeWidth={2.5} />}
+                    label="Start"
+                    ariaLabel="Home"
+                />
 
-                <button
+                <NavButton
                     onClick={onShelf}
-                    className="p-3 text-zinc-400 hover:text-white transition-colors active:scale-90"
-                    aria-label="Shelf"
-                >
-                    <Grid size={22} strokeWidth={2.5} />
-                </button>
+                    icon={<Grid size={20} strokeWidth={2.5} />}
+                    label="Sammlung"
+                    ariaLabel="Sammlung"
+                />
 
-                {/* PRIMARY ACTION - The "Industrial Button" */}
+                {/* PRIMARY ACTION - Scan Button */}
                 <button
                     onClick={handleScanClick}
-                    className="flex items-center justify-center w-14 h-14 rounded-full bg-orange-600 text-white hover:bg-orange-500 active:scale-95 transition-all mx-2 shadow-lg shadow-orange-950/40"
-                    aria-label="Scan Bottle"
+                    className="flex flex-col items-center justify-center w-16 h-16 -mt-4 rounded-full bg-orange-600 text-white hover:bg-orange-500 active:scale-95 transition-all shadow-lg shadow-orange-950/50 border-4 border-zinc-950"
+                    aria-label="Flasche scannen"
                 >
-                    <Scan size={26} strokeWidth={2.5} />
+                    <Scan size={24} strokeWidth={2.5} />
+                    <span className="text-[8px] font-bold tracking-wide mt-0.5">SCAN</span>
                 </button>
 
                 {/* Right Items */}
-                <button
+                <NavButton
                     onClick={onSearch}
-                    className="p-3 text-zinc-400 hover:text-white transition-colors active:scale-90"
-                    aria-label="Search"
-                >
-                    <Search size={22} strokeWidth={2.5} />
-                </button>
+                    icon={<Search size={20} strokeWidth={2.5} />}
+                    label="Filter"
+                    ariaLabel="Filter"
+                />
 
-                <button
+                <NavButton
                     onClick={onProfile}
-                    className="p-3 text-zinc-400 hover:text-white transition-colors active:scale-90"
-                    aria-label="Profile"
-                >
-                    <User size={22} strokeWidth={2.5} />
-                </button>
+                    icon={<User size={20} strokeWidth={2.5} />}
+                    label="Profil"
+                    ariaLabel="Profil"
+                />
             </div>
         </div>
     );

src/components/EmptyState.tsx

@@ -0,0 +1,48 @@
+'use client';
+
+import { motion } from 'framer-motion';
+import { LucideIcon } from 'lucide-react';
+
+interface EmptyStateProps {
+    icon: LucideIcon;
+    title: string;
+    description: string;
+    actionLabel?: string;
+    onAction?: () => void;
+}
+
+/**
+ * Reusable empty state component for lists without data
+ * Shows icon, title, description, and optional action button
+ */
+export default function EmptyState({
+    icon: Icon,
+    title,
+    description,
+    actionLabel,
+    onAction,
+}: EmptyStateProps) {
+    return (
+        <motion.div
+            initial={{ opacity: 0, y: 10 }}
+            animate={{ opacity: 1, y: 0 }}
+            className="flex flex-col items-center justify-center py-12 px-6 text-center"
+        >
+            <div className="w-16 h-16 rounded-2xl bg-zinc-800/50 flex items-center justify-center mb-4">
+                <Icon size={28} className="text-zinc-500" />
+            </div>
+
+            <h3 className="text-lg font-bold text-white mb-2">{title}</h3>
+            <p className="text-sm text-zinc-500 max-w-xs mb-6">{description}</p>
+
+            {actionLabel && onAction && (
+                <button
+                    onClick={onAction}
+                    className="px-6 py-3 bg-orange-600 hover:bg-orange-500 text-white font-bold text-sm rounded-xl transition-colors active:scale-95"
+                >
+                    {actionLabel}
+                </button>
+            )}
+        </motion.div>
+    );
+}