Puzzle: support history images & partial generation

Allow history-generated image paths to be submitted where Data URLs were previously required and avoid treating partial/result-page generations as blocking the whole draft. Backend: resolve history /generated-* references via resolve_puzzle_reference_image_as_data_url and convert to PuzzleDownloadedImage; add PuzzleDownloadedImage::from_resolved_reference_image; extend draft handling to apply generated level metadata (auto-naming) and normalize generation_status to treat levels with images as ready. API: add shouldAutoNameLevel to action contracts and use it to request/refine generated level names. Spacetime/module and mappers: normalize completed level statuses when saving/reading so result-page background or per-level generation doesn't mask completed drafts. Frontend: expose resolver helpers, only mark a work as generating when no usable cover or ready level exists, keep level controls enabled during UI-background regeneration, and add tests covering history-image submission, auto-naming, and UI-background/partial-generation behaviors.

src/components/platform-entry/PlatformEntryFlowShellImpl.tsx

@@ -300,7 +300,11 @@ import { PublishShareModal } from '../common/PublishShareModal';
 import type { PublishShareModalPayload } from '../common/publishShareModalModel';
 import { UnifiedModal } from '../common/UnifiedModal';
 import { resolveCreativeAgentTargetSelectionStage } from '../creative-agent/creativeAgentViewModel';
-import type { CreationWorkShelfItem } from '../custom-world-home/creationWorkShelf';
+import {
+  isPersistedPuzzleDraftGenerating,
+  resolvePuzzleWorkCoverImageSrc,
+  type CreationWorkShelfItem,
+} from '../custom-world-home/creationWorkShelf';
 import {
   isBigFishGalleryEntry,
   isEdutainmentGalleryEntry,
@@ -3403,9 +3407,12 @@ export function PlatformEntryFlowShellImpl({
       const notice = getDraftGenerationNotice(
         getGenerationNoticeShelfKeys(item),
       );
+      const isNoticeGenerating =
+        notice?.status === 'generating' &&
+        (item.source.kind !== 'puzzle' ||
+          !resolvePuzzleWorkCoverImageSrc(item.source.item));
       return {
-        isGenerating:
-          notice?.status === 'generating' || item.isGenerating === true,
+        isGenerating: isNoticeGenerating || item.isGenerating === true,
         hasUnreadUpdate: notice?.status === 'ready' && !notice.seen,
       };
     },
@@ -6495,7 +6502,10 @@ export function PlatformEntryFlowShellImpl({
         }
       }
 
-      if (payload.action === 'generate_puzzle_images') {
+      if (
+        payload.action === 'generate_puzzle_images' ||
+        payload.action === 'generate_puzzle_ui_background'
+      ) {
         void executePuzzleBackgroundAction(payload);
         return;
       }
@@ -8748,13 +8758,16 @@ export function PlatformEntryFlowShellImpl({
         buildPuzzleResultWorkId(item.sourceSessionId),
         buildPuzzleResultProfileId(item.sourceSessionId),
       ]);
-      const isMarkedGenerating = isDraftNoticeGenerating('puzzle', [
+      const hasGeneratingNotice = isDraftNoticeGenerating('puzzle', [
         item.workId,
         item.profileId,
         item.sourceSessionId,
         buildPuzzleResultWorkId(item.sourceSessionId),
         buildPuzzleResultProfileId(item.sourceSessionId),
-      ]) || isPersistedDraftGenerating(item.generationStatus);
+      ]);
+      const isMarkedGenerating =
+        (hasGeneratingNotice && !resolvePuzzleWorkCoverImageSrc(item)) ||
+        isPersistedPuzzleDraftGenerating(item);
       setPuzzleOperation(null);
       setPuzzleRun(null);
       setPuzzleRuntimeAuthMode('default');