fix(nav): remove redundant animations causing flicker

- remove double opacity animation on menu items
- remove slide-in stagger animation
- remove bouncy spring, use smooth easeOut
- remove layoutId animation on active indicator

src/components/navigation/NavTabs.tsx

@@ -99,7 +99,7 @@ export function NavTabs() {
               initial={{ opacity: 0, y: -8, scale: 0.96 }}
               animate={{ opacity: 1, y: 0, scale: 1 }}
               exit={{ opacity: 0, y: -8, scale: 0.96 }}
-              transition={{ type: 'spring', damping: 25, stiffness: 400 }}
+              transition={{ duration: 0.15, ease: 'easeOut' }}
               className="absolute top-full left-0 mt-2 z-50 min-w-[200px]"
             >
               {/* Terminal-style container */}
@@ -119,11 +119,8 @@ export function NavTabs() {
                       tab.path === currentPath || currentPath.startsWith(tab.path)
 
                     return (
-                      <motion.button
+                      <button
                         key={tab.path}
-                        initial={{ opacity: 0, x: -10 }}
-                        animate={{ opacity: 1, x: 0 }}
-                        transition={{ delay: index * 0.05 }}
                         onClick={() => handleSelect(tab.path)}
                         className={`w-full flex items-center gap-3 px-3 py-2.5 rounded-md transition-all group ${
                           isActive
@@ -147,12 +144,9 @@ export function NavTabs() {
 
                         {/* Active indicator */}
                         {isActive && (
-                          <motion.div
-                            layoutId="nav-dropdown-active"
-                            className="w-1.5 h-1.5 rounded-full bg-crab-500"
-                          />
+                          <div className="w-1.5 h-1.5 rounded-full bg-crab-500" />
                         )}
-                      </motion.button>
+                      </button>
                     )
                   })}
                 </div>