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/proposals/ProposalWizard.tsx

@@ -286,9 +286,9 @@ const ProposalWizard: React.FC<ProposalWizardProps> = ({ onComplete, onCancel })
           {/* Step 5: Review */}
           {currentStep === 5 && (
             <div className="space-y-4">
-              <Alert className="border-green-200 bg-green-50">
-                <Check className="w-4 h-4" />
-                <AlertDescription>
+              <Alert className="border-green-200 bg-green-50 text-gray-900">
+                <Check className="w-4 h-4 text-gray-900" />
+                <AlertDescription className="text-gray-900">
                   {t('proposals.wizard.readyToSubmit')}
                 </AlertDescription>
               </Alert>