optimize database queries by excluding bills field

- Added projections to exclude bills field from location lookup queries
- Optimized updateOrAddLocation currentLocation query (line 79)
- Optimized duplicate check query for subsequent months (line 201)
- Optimized deleteLocationById location lookup query (line 372)
- Reduces network traffic and memory usage by avoiding unnecessary bills data
- Improves query performance especially for locations with many bills or large attachments

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

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

app/lib/actions/locationActions.ts

@@ -76,7 +76,7 @@ export const updateOrAddLocation = withUser(async (user:AuthenticatedUser, locat
     if(locationId) {
         // Get the current location first to find its name
         const currentLocation = await dbClient.collection<BillingLocation>("lokacije")
-            .findOne({ _id: locationId, userId });
+            .findOne({ _id: locationId, userId }, { projection: { bills: 0 } });
 
         if (!currentLocation) {
             return {
@@ -198,7 +198,7 @@ export const updateOrAddLocation = withUser(async (user:AuthenticatedUser, locat
                         name: locationName,
                         "yearMonth.year": monthData.year,
                         "yearMonth.month": monthData.month
-                    });
+                    }, { projection: { bills: 0 } });
 
                 // Only add if location with same name doesn't already exist in that month
                 if (!existingLocation) {
@@ -369,7 +369,7 @@ export const deleteLocationById = withUser(async (user:AuthenticatedUser, locati
     if (deleteInSubsequentMonths) {
         // Get the location name first to find all locations with the same name
         const location = await dbClient.collection<BillingLocation>("lokacije")
-            .findOne({ _id: locationID, userId });
+            .findOne({ _id: locationID, userId }, { projection: { bills: 0 } });
 
         if (location) {
             // Delete all locations with the same name in current and subsequent months