Fix TypeScript errors in server actions

Added explicit return statements after redirect calls in all server
actions to satisfy TypeScript type checking. These returns won't be
reached due to redirects but are needed for type safety.

Fixed in:
- userProfileActions.ts (updateUserProfile)
- locationActions.ts (updateOrAddLocation, deleteLocationById)
- billActions.ts (updateOrAddBill, deleteBill)

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

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

app/lib/actions/billActions.ts

@@ -282,6 +282,12 @@ export const updateOrAddBill = withUser(async (user:AuthenticatedUser, locationI
         const locale = await getLocale();
         await gotoHomeWithMessage(locale, 'billSaved');
     }
+
+    // This return is needed for TypeScript, but won't be reached due to redirect
+    return {
+        message: null,
+        errors: undefined,
+    };
 })
 /*
 Funkcija zamijenjena sa `fetchBillByUserAndId`, koja brže radi i ne treba korisnika
@@ -449,4 +455,10 @@ export const deleteBillById = withUser(async (user:AuthenticatedUser, locationID
 
     const locale = await getLocale();
     await gotoHomeWithMessage(locale, 'billDeleted');
+
+    // This return is needed for TypeScript, but won't be reached due to redirect
+    return {
+        message: null,
+        errors: undefined,
+    };
 });