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/treasury/FundingProposal.tsx

@@ -276,9 +276,9 @@ export const FundingProposal: React.FC = () => {
           </Button>
 
           {totalMilestoneAmount !== totalBudget && totalMilestoneAmount > 0 && (
-            <div className="flex items-center gap-2 p-3 bg-yellow-50 dark:bg-yellow-900/20 rounded-lg">
+            <div className="flex items-center gap-2 p-3 bg-yellow-50 dark:bg-yellow-900/20 rounded-lg text-gray-900">
               <AlertCircle className="h-5 w-5 text-yellow-600" />
-              <span className="text-sm">
+              <span className="text-sm text-gray-900">
                 Milestone total (${totalMilestoneAmount.toLocaleString()}) doesn't match budget total (${totalBudget.toLocaleString()})
               </span>
             </div>