Fix NocoDB date format by adding timestamps to date queries

NocoDB expects datetime values with timestamps, not just dates.
Convert YYYY-MM-DD format to "YYYY-MM-DD HH:MM:SS" format:
- dateFrom uses 00:00:00 (start of day)
- dateTo uses 23:59:59 (end of day)

This fixes the "422 - date is not supported" errors on admin
dashboard and orders pages.

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

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

src/api/nocodbClient.ts

@@ -89,11 +89,15 @@ export class NocoDBClient {
     }
 
     if (filters.dateFrom) {
-      conditions.push(`(CreatedAt,gte,${filters.dateFrom})`);
+      // Convert YYYY-MM-DD to ISO timestamp at start of day
+      const dateFromTimestamp = `${filters.dateFrom} 00:00:00`;
+      conditions.push(`(CreatedAt,gte,${dateFromTimestamp})`);
     }
 
     if (filters.dateTo) {
-      conditions.push(`(CreatedAt,lte,${filters.dateTo})`);
+      // Convert YYYY-MM-DD to ISO timestamp at end of day
+      const dateToTimestamp = `${filters.dateTo} 23:59:59`;
+      conditions.push(`(CreatedAt,lte,${dateToTimestamp})`);
     }
 
     if (filters.minAmount !== undefined) {