Migrate date precision to exact

Batch update all date precision handling to use expanded DatePrecision, replace hardcoded day defaults, and adjust related validation, UI, and helpers. Includes wrapper migration across Phase 1-3 functions, updates to logs, displays, and formatting utilities to align frontend with new precision values ('exact', 'month', 'year', 'decade', 'century', 'approximate').

src/components/moderation/FieldComparison.tsx

@@ -5,8 +5,10 @@ import { ArrowRight } from 'lucide-react';
 import { ArrayFieldDiff } from './ArrayFieldDiff';
 import { SpecialFieldDisplay } from './SpecialFieldDisplay';
 
+import type { DatePrecision } from '@/components/ui/flexible-date-input';
+
 // Helper to format compact values (truncate long strings)
-function formatCompactValue(value: unknown, precision?: 'day' | 'month' | 'year', maxLength = 30): string {
+function formatCompactValue(value: unknown, precision?: DatePrecision, maxLength = 30): string {
   const formatted = formatFieldValue(value, precision);
   if (formatted.length > maxLength) {
     return formatted.substring(0, maxLength) + '...';

src/components/moderation/SpecialFieldDisplay.tsx

@@ -211,7 +211,13 @@ function DateFieldDisplay({ change, compact }: { change: FieldChange; compact: b
         {formatFieldName(change.field)}
         {precision && (
           <Badge variant="outline" className="text-xs ml-2">
-            {precision === 'year' ? 'Year Only' : precision === 'month' ? 'Month & Year' : 'Full Date'}
+            {precision === 'exact' ? 'Exact Day' :
+             precision === 'month' ? 'Month & Year' :
+             precision === 'year' ? 'Year Only' :
+             precision === 'decade' ? 'Decade' :
+             precision === 'century' ? 'Century' :
+             precision === 'approximate' ? 'Approximate' :
+             'Full Date'}
           </Badge>
         )}
       </div>