fix: Improve text readability on light backgrounds

Fixed white/light text on white/light backgrounds across multiple pages by adding text-gray-900 classes to ensure proper contrast and readability. This addresses the issue where text was unreadable until hover/click on delegation, proposal, swap, and other pages.

Changes:
- DelegationManager: Added dark text to green-50 TabsList
- DelegateProfile: Fixed text color in blue-50 and green-50 Alert components
- ProposalWizard: Added dark text to green-50 success Alert
- Dashboard: Fixed text color in yellow-50 verification warning
- TokenSwap: Added dark text to all gray-50 and blue-50 containers (6 instances)
- DiscussionThread: Fixed markdown help card with gray-50 background
- FundingProposal: Added dark text to yellow-50 milestone warning

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

src/components/delegation/DelegateProfile.tsx

@@ -50,9 +50,9 @@ const DelegateProfile: React.FC = () => {
           </CardDescription>
         </CardHeader>
         <CardContent className="space-y-6">
-          <Alert className="border-blue-200 bg-blue-50">
-            <Info className="w-4 h-4" />
-            <AlertDescription>
+          <Alert className="border-blue-200 bg-blue-50 text-gray-900">
+            <Info className="w-4 h-4 text-gray-900" />
+            <AlertDescription className="text-gray-900">
               {t('delegation.delegateRequirements')}
             </AlertDescription>
           </Alert>
@@ -215,9 +215,9 @@ const DelegateProfile: React.FC = () => {
         </CardTitle>
       </CardHeader>
       <CardContent>
-        <Alert className="border-green-200 bg-green-50 mb-6">
-          <CheckCircle className="w-4 h-4" />
-          <AlertDescription>
+        <Alert className="border-green-200 bg-green-50 mb-6 text-gray-900">
+          <CheckCircle className="w-4 h-4 text-gray-900" />
+          <AlertDescription className="text-gray-900">
             {t('delegation.delegateActive')}
           </AlertDescription>
         </Alert>