refactor: disable automatic slug regeneration on field and section name updates to ensure stable references

src/profile-fields/profile-sections.service.ts

@@ -108,13 +108,9 @@ export class ProfileSectionsService {
 
     const data: any = { ...updateSectionDto };
 
-    // Resolve effective slug: explicit slug from DTO wins; otherwise regenerate from name if name changed
-    let effectiveSlug: string | undefined;
-    if (updateSectionDto.slug) {
-      effectiveSlug = updateSectionDto.slug;
-    } else if (updateSectionDto.name) {
-      effectiveSlug = this.generateSlug(updateSectionDto.name);
-    }
+    // Slug only changes when admin explicitly sends one — renaming the section never
+    // regenerates it, so field/section references stay stable.
+    const effectiveSlug: string | undefined = updateSectionDto.slug;
 
     if (effectiveSlug) {
       // Check if slug conflicts with another section