Fix founded year/date handling

src/lib/submissionChangeDetection.ts

@@ -8,6 +8,9 @@ export interface FieldChange {
   changeType: 'added' | 'removed' | 'modified';
   metadata?: {
     isCreatingNewLocation?: boolean;
+    precision?: 'day' | 'month' | 'year';
+    oldPrecision?: 'day' | 'month' | 'year';
+    newPrecision?: 'day' | 'month' | 'year';
   };
 }
 
@@ -234,28 +237,32 @@ export async function detectChanges(
 
       // Check for changes
       if (!isEqual(oldValue, newValue)) {
-        if (oldEmpty && !newEmpty) {
-          fieldChanges.push({
-            field: key,
-            oldValue,
-            newValue,
-            changeType: 'added',
-          });
-        } else if (newEmpty && !oldEmpty) {
-          fieldChanges.push({
-            field: key,
-            oldValue,
-            newValue,
-            changeType: 'removed',
-          });
-        } else {
-          fieldChanges.push({
-            field: key,
-            oldValue,
-            newValue,
-            changeType: 'modified',
-          });
+        const fieldChange: FieldChange = {
+          field: key,
+          oldValue,
+          newValue,
+          changeType: oldEmpty && !newEmpty ? 'added' : 
+                     newEmpty && !oldEmpty ? 'removed' : 
+                     'modified',
+        };
+        
+        // Add precision metadata for date fields
+        if (key.endsWith('_date') && !key.endsWith('_precision')) {
+          const precisionKey = `${key}_precision`;
+          const newPrecision = itemData[precisionKey];
+          const oldPrecision = originalData[precisionKey];
+          
+          if (newPrecision || oldPrecision) {
+            fieldChange.metadata = {
+              ...fieldChange.metadata,
+              precision: newPrecision || oldPrecision,
+              oldPrecision,
+              newPrecision,
+            };
+          }
         }
+        
+        fieldChanges.push(fieldChange);
       }
     });
 
@@ -490,14 +497,23 @@ function formatEntityType(entityType: string): string {
 /**
  * Format field value for display
  */
-export function formatFieldValue(value: any): string {
+export function formatFieldValue(value: any, precision?: 'day' | 'month' | 'year'): string {
   if (value === null || value === undefined) return 'None';
   if (typeof value === 'boolean') return value ? 'Yes' : 'No';
   
-  // Handle dates
+  // Handle dates with precision support
   if (value instanceof Date || (typeof value === 'string' && /^\d{4}-\d{2}-\d{2}/.test(value))) {
     try {
       const date = new Date(value);
+      
+      // Apply precision if provided
+      if (precision === 'year') {
+        return date.getFullYear().toString();
+      } else if (precision === 'month') {
+        return date.toLocaleDateString('en-US', { year: 'numeric', month: 'long' });
+      }
+      
+      // Default: full date
       return date.toLocaleDateString('en-US', { year: 'numeric', month: 'long', day: 'numeric' });
     } catch {
       return String(value);
@@ -525,6 +541,15 @@ export function formatFieldValue(value: any): string {
     return entries.map(([k, v]) => `${k}: ${v}`).join(', ');
   }
   
+  // Handle year-like numbers (prevent comma formatting for founded_year)
+  if (typeof value === 'number') {
+    const currentYear = new Date().getFullYear();
+    if (value >= 1800 && value <= currentYear + 10) {
+      return value.toString(); // Don't add commas for year values
+    }
+    return value.toLocaleString(); // Add commas for other numbers
+  }
+  
   // Handle URLs
   if (typeof value === 'string' && value.startsWith('http')) {
     try {