Refactor bio update logic in profile route: Adjust bio assignment to handle null values correctly, ensuring proper trimming and assignment of user bio data.

app/api/profile/route.ts

@@ -145,7 +145,7 @@ export async function PUT(request: Request) {
       updateData.avatar = avatar || null;
     }
     if (bio !== undefined) {
-      updateData.bio = bio.trim() || null;
+      updateData.bio = bio === null ? null : bio.trim() || null;
     }
     if (characterClass !== undefined) {
       updateData.characterClass = (characterClass as CharacterClass) || null;