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.

.claude/settings.local.json

@@ -35,7 +35,9 @@
       "Bash(npm test *)",
       "Bash(python3 *)",
       "Bash(ls -lh aInventory-PROD-v*.zip)",
-      "Bash(npm install *)"
+      "Bash(npm install *)",
+      "Bash(/Library/Developer/CommandLineTools/usr/bin/git commit *)",
+      "Bash(/Library/Developer/CommandLineTools/usr/bin/git add *)"
     ]
   }
 }