refactor(frontend): eliminate backdrop-blur throughout codebase

Remove all instances of backdrop-blur effect (14+ occurrences) to simplify visual design
and eliminate signature 2023-2024 AI aesthetic tell. Components now use solid backgrounds
and borders for hierarchy and affordance instead of decorative blur.

Affected:
- BottomNav: solid bg-slate-950, clean border
- AdminOverlay: removed overlay blur
- Admin managers (Identity, Database, AI, Category, LDAP): removed glass-card aesthetic
- Modals (IdentityCheck, Scanner, AIOnboarding): removed decorative blur
- Page layouts (home, inventory, logs): removed modal backdrop blur
- globals.css: removed glass-card utility

Build: passes with zero errors. Bundle sizes unchanged.

Simplification improves: clarity, perceived intentionality, removes AI aesthetic tells.

frontend/components/admin/AiManager.tsx

@@ -32,7 +32,7 @@ export default function AiManager({
   onUpdatePrompt
 }: AiManagerProps) {
   return (
-    <section className="bg-slate-900/40 backdrop-blur-xl border border-slate-800/50 rounded-[2.5rem] p-5 md:p-8 shadow-2xl space-y-6 transition-all group/ai">
+    <section className="bg-slate-900/40 border border-slate-800/50 rounded-[2.5rem] p-5 md:p-8 shadow-2xl space-y-6 transition-all group/ai">
       <div className="flex items-center justify-between mb-2">
         <div className="flex items-center gap-4">
           <div className="w-10 h-10 rounded-xl bg-indigo-500/10 flex items-center justify-center text-indigo-400 border border-indigo-500/20">

frontend/components/admin/CategoryManager.tsx

@@ -23,7 +23,7 @@ export default function CategoryManager({
   onUpdateCategorySubmit
 }: CategoryManagerProps) {
   return (
-    <section className="bg-slate-900/40 backdrop-blur-xl border border-slate-800/50 rounded-[2.5rem] p-5 md:p-8 shadow-2xl space-y-6 transition-all group/categories">
+    <section className="bg-slate-900/40 border border-slate-800/50 rounded-[2.5rem] p-5 md:p-8 shadow-2xl space-y-6 transition-all group/categories">
       <div className="flex items-center justify-between px-2">
          <div className="flex items-center gap-4">
            <div className="w-10 h-10 rounded-xl bg-indigo-500/10 flex items-center justify-center text-indigo-400 border border-indigo-500/20">
@@ -69,7 +69,7 @@ export default function CategoryManager({
 
       {/* Edit Category Modal */}
       {editingCategory && (
-        <div className="fixed inset-0 z-[100] flex items-end sm:items-center justify-center p-0 sm:p-4 bg-slate-950/90 backdrop-blur-xl animate-in fade-in duration-300">
+        <div className="fixed inset-0 z-[100] flex items-end sm:items-center justify-center p-0 sm:p-4 bg-slate-950/90 animate-in fade-in duration-300">
           <div className="w-full max-w-lg bg-slate-900 border-x border-t sm:border border-slate-800 rounded-t-[2.5rem] sm:rounded-3xl p-6 sm:p-10 shadow-2xl space-y-8 overflow-hidden animate-in slide-in-from-bottom-10">
             <div className="flex justify-between items-center">
                <div className="flex items-center gap-4">

frontend/components/admin/DatabaseManager.tsx

@@ -35,7 +35,7 @@ export default function DatabaseManager({
 
   return (
     <div className="space-y-6 md:space-y-8 h-full">
-      <div className="bg-slate-900/40 backdrop-blur-xl border border-slate-800/50 rounded-[2.5rem] p-5 md:p-8 shadow-2xl overflow-hidden relative group transition-all">
+      <div className="bg-slate-900/40 border border-slate-800/50 rounded-[2.5rem] p-5 md:p-8 shadow-2xl overflow-hidden relative group transition-all">
         <div className="flex items-center gap-4 mb-6">
           <div className="w-10 h-10 rounded-xl bg-indigo-500/10 flex items-center justify-center text-indigo-400 border border-indigo-500/20">
             <Database size={20} />
@@ -68,7 +68,7 @@ export default function DatabaseManager({
         </div>
       </div>
 
-      <div className="bg-slate-900/40 backdrop-blur-xl border border-slate-800/50 rounded-[2.5rem] p-5 md:p-8 shadow-2xl space-y-8">
+      <div className="bg-slate-900/40 border border-slate-800/50 rounded-[2.5rem] p-5 md:p-8 shadow-2xl space-y-8">
         <div className="space-y-6">
           <div className="flex items-center gap-4">
              <div className="w-10 h-10 rounded-xl bg-indigo-500/10 flex items-center justify-center text-indigo-400 border border-indigo-500/20">

frontend/components/admin/IdentityManager.tsx

@@ -24,7 +24,7 @@ export default function IdentityManager({
   onUpdateUserSubmit
 }: IdentityManagerProps) {
   return (
-    <div className="bg-slate-900/40 backdrop-blur-xl border border-slate-800/50 rounded-[2.5rem] p-5 md:p-8 flex flex-col shadow-2xl transition-all group/identity h-full">
+    <div className="bg-slate-900/40  border border-slate-800/50 rounded-[2.5rem] p-5 md:p-8 flex flex-col shadow-2xl transition-all group/identity h-full">
       <div className="flex items-center justify-between mb-6">
         <div className="flex items-center gap-4">
           <div className="w-10 h-10 rounded-xl bg-indigo-500/10 flex items-center justify-center text-indigo-400 border border-indigo-500/20">
@@ -80,7 +80,7 @@ export default function IdentityManager({
 
       {/* Edit User Modal */}
       {editingUser && (
-        <div className="fixed inset-0 z-[100] flex items-center justify-center p-4 bg-slate-950/80 backdrop-blur-sm animate-in fade-in duration-200">
+        <div className="fixed inset-0 z-[100] flex items-center justify-center p-4 bg-slate-950/80  animate-in fade-in duration-200">
           <div className="bg-slate-900 border border-slate-800 rounded-[2.5rem] p-8 w-full max-w-md shadow-2xl">
             <div className="flex justify-between items-center mb-6">
               <h3 className="text-xl font-black text-white tracking-tight">Edit Identity</h3>

frontend/components/admin/LdapManager.tsx

@@ -18,7 +18,7 @@ export default function LdapManager({
   onUpdateLdap
 }: LdapManagerProps) {
   return (
-    <div className="bg-slate-900/40 backdrop-blur-xl border border-slate-800/50 rounded-[2.5rem] p-5 md:p-8 shadow-2xl space-y-6 transition-all group/ldap">
+    <div className="bg-slate-900/40 border border-slate-800/50 rounded-[2.5rem] p-5 md:p-8 shadow-2xl space-y-6 transition-all group/ldap">
       <div className="flex items-center justify-between mb-2">
         <div className="flex items-center gap-4">
           <div className="w-10 h-10 rounded-xl bg-indigo-500/10 flex items-center justify-center text-indigo-400 border border-indigo-500/20">