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/forum/ForumOverview.tsx

@@ -6,6 +6,7 @@ import { Badge } from '@/components/ui/badge';
 import { Alert, AlertDescription, AlertTitle } from '@/components/ui/alert';
 import { Tabs, TabsContent, TabsList, TabsTrigger } from '@/components/ui/tabs';
 import { Select, SelectContent, SelectItem, SelectTrigger, SelectValue } from '@/components/ui/select';
+import { LoadingState } from '@pezkuwi/components/AsyncComponent';
 import {
   MessageSquare,
   Users,
@@ -105,12 +106,7 @@ export function ForumOverview() {
   }
 
   if (loading) {
-    return (
-      <div className="flex items-center justify-center py-12">
-        <Loader2 className="h-8 w-8 animate-spin text-primary" />
-        <span className="ml-3 text-muted-foreground">Loading forum...</span>
-      </div>
-    );
+    return <LoadingState message="Loading forum..." />;
   }
 
   return (