Standardize loading states across all components

Replaced custom loading spinners with standardized LoadingState component from AsyncComponent.tsx. This ensures consistent UX for all data-loading operations.

Changes:
- web/src/components/staking/StakingDashboard.tsx: LoadingState for staking data
- web/src/components/governance/GovernanceOverview.tsx: LoadingState for governance data
- web/src/components/governance/ProposalsList.tsx: LoadingState for proposals
- web/src/components/dex/PoolBrowser.tsx: LoadingState for liquidity pools
- web/src/components/delegation/DelegationManager.tsx: LoadingState for delegation data
- web/src/components/forum/ForumOverview.tsx: LoadingState for forum threads
- web/src/components/treasury/TreasuryOverview.tsx: LoadingState for treasury data

All components now show:
- Kurdistan green animated spinner (Loader2)
- Contextual loading messages
- Consistent padding and centering
- Professional appearance

Button loading states (auth, wallet modals) left as-is since they appropriately disable during actions.

web/src/components/delegation/DelegationManager.tsx

@@ -13,6 +13,7 @@ import DelegateProfile from './DelegateProfile';
 import { useDelegation } from '@/hooks/useDelegation';
 import { usePolkadot } from '@/contexts/PolkadotContext';
 import { formatNumber } from '@/lib/utils';
+import { LoadingState } from '@pezkuwi/components/AsyncComponent';
 
 const DelegationManager: React.FC = () => {
   const { t } = useTranslation();
@@ -37,14 +38,7 @@ const DelegationManager: React.FC = () => {
   };
 
   if (loading) {
-    return (
-      <div className="container mx-auto px-4 py-8 max-w-7xl">
-        <div className="flex items-center justify-center py-12">
-          <Loader2 className="h-8 w-8 animate-spin text-green-600 mr-3" />
-          <span className="text-lg">Loading delegation data from blockchain...</span>
-        </div>
-      </div>
-    );
+    return <LoadingState message="Loading delegation data from blockchain..." />;
   }
 
   if (error) {