feat: standardize input styling with tier system, add depth and admin features

- Define 4 input tier CSS classes (input-standard, input-search, input-embedded, input-danger)
  in globals.css, migrating ~50 inputs across ~28 component files to use them
- Add subtle border and inset shadow to solid input tiers for resting-state visibility
- Fix focus ring clipping in settings panel scroll container
- Fix phantom Tailwind tokens (border-border-primary, placeholder-txt-muted)
- Add admin user management panel, storage management, and account deletion utilities

packages/web/src/styles/globals.css

@@ -203,6 +203,33 @@
   .glass-pill-mine:hover {
     background: rgba(134, 239, 172, 0.16);
   }
+
+  /* ── Input Tiers ── */
+  .input-standard {
+    @apply bg-surface-input rounded px-3 py-2 text-sm text-txt-primary
+           placeholder:text-txt-tertiary outline-none
+           border border-white/[0.06] shadow-input
+           focus:ring-2 focus:ring-accent-primary focus:border-accent-primary/30
+           transition-colors;
+  }
+  .input-search {
+    @apply bg-surface-input rounded px-3 py-1.5 text-sm text-txt-primary
+           placeholder:text-txt-tertiary outline-none
+           border border-white/[0.06] shadow-input
+           focus:ring-1 focus:ring-accent-primary focus:border-accent-primary/30
+           transition-colors;
+  }
+  .input-embedded {
+    @apply bg-transparent text-txt-primary
+           placeholder:text-txt-tertiary/60 outline-none;
+  }
+  .input-danger {
+    @apply bg-surface-input rounded px-3 py-2 text-sm text-txt-primary
+           placeholder:text-txt-tertiary outline-none
+           border border-white/[0.06] shadow-input
+           focus:ring-2 focus:ring-accent-rose focus:border-accent-rose/30
+           transition-colors;
+  }
 }
 
 /* Accessibility: fall back to solid surfaces when transparency is reduced */