feat(cabinet): migrate all icons to the panel's Phosphor set

Replace the cabinet's hand-written heroicons-style SVG icon components with
the Remnawave panel's own icon family — Phosphor via react-icons/pi (Duotone).
All icons now live in a single central barrel (src/components/icons:
index + extended-icons + editor-icons, 144 icons); every feature file imports
from it instead of redefining inline SVGs (~440 icon defs removed).

- Add react-icons dependency
- Desktop nav (AppShell) now uses the central Phosphor icons, removing a
  stroke-vs-duotone inconsistency the partial migration introduced
- Icons with custom props (SortIcon's direction, expandable chevrons) kept as
  thin Phosphor wrappers; the RemnawaveIcon brand logo and animated SVGs
  (checkmarks, spinners) are intentionally left as-is
- Restore the original per-call-site icon sizes wherever the centralized
  default differed (211 call sites)

src/pages/AdminCampaignStats.tsx

@@ -10,47 +10,7 @@ import { PARTNER_STATS } from '../constants/partner';
 import { useCurrency } from '../hooks/useCurrency';
 import { copyToClipboard } from '../utils/clipboard';
 import { useHaptic } from '../platform';
-
-// Icons
-const CopyIcon = () => (
-  <svg className="h-4 w-4" fill="none" viewBox="0 0 24 24" stroke="currentColor" strokeWidth={2}>
-    <path
-      strokeLinecap="round"
-      strokeLinejoin="round"
-      d="M15.666 3.888A2.25 2.25 0 0013.5 2.25h-3c-1.03 0-1.9.693-2.166 1.638m7.332 0c.055.194.084.4.084.612v0a.75.75 0 01-.75.75H9a.75.75 0 01-.75-.75v0c0-.212.03-.418.084-.612m7.332 0c.646.049 1.288.11 1.927.184 1.1.128 1.907 1.077 1.907 2.185V19.5a2.25 2.25 0 01-2.25 2.25H6.75A2.25 2.25 0 014.5 19.5V6.257c0-1.108.806-2.057 1.907-2.185a48.208 48.208 0 011.927-.184"
-    />
-  </svg>
-);
-
-const LinkIcon = () => (
-  <svg className="h-4 w-4" fill="none" viewBox="0 0 24 24" stroke="currentColor" strokeWidth={2}>
-    <path
-      strokeLinecap="round"
-      strokeLinejoin="round"
-      d="M13.19 8.688a4.5 4.5 0 011.242 7.244l-4.5 4.5a4.5 4.5 0 01-6.364-6.364l1.757-1.757m13.35-.622l1.757-1.757a4.5 4.5 0 00-6.364-6.364l-4.5 4.5a4.5 4.5 0 001.242 7.244"
-    />
-  </svg>
-);
-
-const UsersIcon = () => (
-  <svg className="h-5 w-5" fill="none" viewBox="0 0 24 24" stroke="currentColor" strokeWidth={1.5}>
-    <path
-      strokeLinecap="round"
-      strokeLinejoin="round"
-      d="M15 19.128a9.38 9.38 0 002.625.372 9.337 9.337 0 004.121-.952 4.125 4.125 0 00-7.533-2.493M15 19.128v-.003c0-1.113-.285-2.16-.786-3.07M15 19.128v.106A12.318 12.318 0 018.624 21c-2.331 0-4.512-.645-6.374-1.766l-.001-.109a6.375 6.375 0 0111.964-3.07M12 6.375a3.375 3.375 0 11-6.75 0 3.375 3.375 0 016.75 0zm8.25 2.25a2.625 2.625 0 11-5.25 0 2.625 2.625 0 015.25 0z"
-    />
-  </svg>
-);
-
-const ChartIcon = () => (
-  <svg className="h-6 w-6" fill="none" viewBox="0 0 24 24" stroke="currentColor" strokeWidth={1.5}>
-    <path
-      strokeLinecap="round"
-      strokeLinejoin="round"
-      d="M3 13.125C3 12.504 3.504 12 4.125 12h2.25c.621 0 1.125.504 1.125 1.125v6.75C7.5 20.496 6.996 21 6.375 21h-2.25A1.125 1.125 0 013 19.875v-6.75zM9.75 8.625c0-.621.504-1.125 1.125-1.125h2.25c.621 0 1.125.504 1.125 1.125v11.25c0 .621-.504 1.125-1.125 1.125h-2.25a1.125 1.125 0 01-1.125-1.125V8.625zM16.5 4.125c0-.621.504-1.125 1.125-1.125h2.25C20.496 3 21 3.504 21 4.125v15.75c0 .621-.504 1.125-1.125 1.125h-2.25a1.125 1.125 0 01-1.125-1.125V4.125z"
-    />
-  </svg>
-);
+import { ChartIcon, CopyIcon, LinkIcon, UsersIcon } from '@/components/icons';
 
 // Bonus type config
 const bonusTypeConfig: Record<
@@ -205,7 +165,7 @@ export default function AdminCampaignStats() {
         <div className="flex items-center gap-3">
           <AdminBackButton to="/admin/campaigns" />
           <div className="rounded-lg bg-accent-500/20 p-2 text-accent-400">
-            <ChartIcon />
+            <ChartIcon className="h-6 w-6" />
           </div>
           <div className="min-w-0">
             <h1 className="truncate text-xl font-semibold text-dark-100">{stats.name}</h1>
@@ -240,7 +200,7 @@ export default function AdminCampaignStats() {
                 </div>
                 <div className="flex items-center justify-between gap-2">
                   <div className="flex min-w-0 items-center gap-2">
-                    <LinkIcon />
+                    <LinkIcon className="h-4 w-4" />
                     <span className="truncate text-sm text-dark-300">{stats.deep_link}</span>
                   </div>
                   <button
@@ -264,7 +224,7 @@ export default function AdminCampaignStats() {
                 </div>
                 <div className="flex items-center justify-between gap-2">
                   <div className="flex min-w-0 items-center gap-2">
-                    <LinkIcon />
+                    <LinkIcon className="h-4 w-4" />
                     <span className="truncate text-sm text-dark-300">{stats.web_link}</span>
                   </div>
                   <button