fix(platform): fix library agent version updates and image prepopulation

Backend fixes:
- Fix unique constraint violation in update_agent_version_in_library by deleting conflicting records before update
- Maintain proper transactional safety for version updates
- Preserve original function contract (expects existing agent, throws if not found)

Frontend fixes:
- Remove redundant hasSubmissionForCurrentVersion logic breaking unpublished changes banner
- Fix marketplace update form to prepopulate images (users can keep/remove/add as needed)
- Fix duplicate image issue caused by recreating non-deduplicated array in return value
- Simplify unpublished changes detection to check current > highest submitted version

This resolves the banner not disappearing after marketplace updates and prevents users from having to re-upload images for simple bugfixes.

autogpt_platform/backend/backend/api/features/library/db.py

@@ -504,14 +504,25 @@ async def update_agent_version_in_library(
         f"Updating agent version in library for user #{user_id}, "
         f"agent #{agent_graph_id} v{agent_graph_version}"
     )
-    try:
-        library_agent = await prisma.models.LibraryAgent.prisma().find_first_or_raise(
+    async with transaction() as tx:
+        library_agent = await prisma.models.LibraryAgent.prisma(tx).find_first_or_raise(
             where={
                 "userId": user_id,
                 "agentGraphId": agent_graph_id,
             },
         )
-        lib = await prisma.models.LibraryAgent.prisma().update(
+
+        # Delete any conflicting LibraryAgent for the target version
+        await prisma.models.LibraryAgent.prisma(tx).delete_many(
+            where={
+                "userId": user_id,
+                "agentGraphId": agent_graph_id,
+                "agentGraphVersion": agent_graph_version,
+                "id": {"not": library_agent.id},
+            }
+        )
+
+        lib = await prisma.models.LibraryAgent.prisma(tx).update(
             where={"id": library_agent.id},
             data={
                 "AgentGraph": {
@@ -525,13 +536,13 @@ async def update_agent_version_in_library(
             },
             include={"AgentGraph": True},
         )
-        if lib is None:
-            raise NotFoundError(f"Library agent {library_agent.id} not found")
 
-        return library_model.LibraryAgent.from_db(lib)
-    except prisma.errors.PrismaError as e:
-        logger.error(f"Database error updating agent version in library: {e}")
-        raise DatabaseError("Failed to update agent version in library") from e
+    if lib is None:
+        raise NotFoundError(
+            f"Failed to update library agent for {agent_graph_id} v{agent_graph_version}"
+        )
+
+    return library_model.LibraryAgent.from_db(lib)
 
 
 async def update_library_agent(

autogpt_platform/frontend/src/components/contextual/PublishAgentModal/components/AgentInfoStep/useAgentInfoStep.ts

@@ -53,14 +53,14 @@ export function useAgentInfoStep({
   useEffect(() => {
     if (initialData?.agent_id) {
       setAgentId(initialData.agent_id);
-      if (!isMarketplaceUpdate) {
-        const initialImages = [
-          ...(initialData?.thumbnailSrc ? [initialData.thumbnailSrc] : []),
-          ...(initialData.additionalImages || []),
-        ];
-        setImages(initialImages);
-      }
-
+      setImages(
+        Array.from(
+          new Set([
+            ...(initialData?.thumbnailSrc ? [initialData.thumbnailSrc] : []),
+            ...(initialData.additionalImages || []),
+          ]),
+        ),
+      );
       form.reset({
         changesSummary: isMarketplaceUpdate
           ? ""
@@ -152,12 +152,7 @@ export function useAgentInfoStep({
     agentId,
     images,
     isSubmitting,
-    initialImages: initialData
-      ? [
-          ...(initialData?.thumbnailSrc ? [initialData.thumbnailSrc] : []),
-          ...(initialData.additionalImages || []),
-        ]
-      : [],
+    initialImages: images,
     initialSelectedImage: initialData?.thumbnailSrc || null,
     handleImagesChange,
     handleSubmit: form.handleSubmit(handleFormSubmit),