Fix member ID display in dues management cards

- Changed to display actual member_id field value
- Show 'Pending' when member_id is not set instead of generating MUSA-ID format
- Ensures consistency with actual database member IDs

🤖 Generated with Claude Code

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

components/DuesActionCard.vue

@@ -36,7 +36,7 @@
           </h4>
           <div class="d-flex align-center">
             <v-chip size="x-small" color="grey" variant="text" class="pa-0 mr-2">
-              ID: {{ member.member_id || `MUSA-${member.Id}` }}
+              ID: {{ member.member_id || 'Pending' }}
             </v-chip>
             <MultipleCountryFlags
               v-if="member.nationality"