pagedraw(webapp): map resolution/aspect-ratio labels to omni-gen enums

The shared PageDraw lib's PromptBox emits resolution and aspect ratio as UI
labels ("1k", "wide", …), and each host adapter is responsible for mapping
them to the server's CommonResolution / CommonAspectRatio enum values
("one_k", …) — the desktop adapter does this, but the webapp adapter forwarded
the raw label. The omni-gen endpoint then rejected the whole body with
'unknown variant 1k', so every generation 400'd.

Add mapAspectRatio / mapResolution helpers mirroring the desktop PageDraw
adapter and apply them when building the OmniGenImageRequest.

frontend/apps/artcraft-webapp/src/pages/pagedraw/web-adapter.tsx

@@ -21,6 +21,7 @@ import {
   type BaseSelectorImage,
   useSceneStore,
 } from "@storyteller/ui-pagedraw";
+import { CommonAspectRatio, CommonResolution } from "@storyteller/model-list";
 import {
   OmniGenApi,
   StorytellerApiHostStore,
@@ -141,6 +142,29 @@ const uploadBlobAsImage = async (
   return mediaToken;
 };
 
+// The PromptBox UI emits resolution/aspect-ratio as display labels ("1k",
+// "wide", …); the omni-gen REST body wants the CommonResolution /
+// CommonAspectRatio enum values ("one_k", "wide", …). Mirror the desktop
+// PageDraw adapter's mappers so an unmapped "1k" doesn't 400 the request.
+const mapAspectRatio = (ratio?: string): CommonAspectRatio | undefined => {
+  switch (ratio) {
+    case "auto":   return CommonAspectRatio.Auto;
+    case "wide":   return CommonAspectRatio.Wide;
+    case "tall":   return CommonAspectRatio.Tall;
+    case "square": return CommonAspectRatio.Square;
+    default:       return undefined;
+  }
+};
+
+const mapResolution = (res?: string): CommonResolution | undefined => {
+  switch (res) {
+    case "1k": return CommonResolution.OneK;
+    case "2k": return CommonResolution.TwoK;
+    case "4k": return CommonResolution.FourK;
+    default:   return undefined;
+  }
+};
+
 // PageDrawEditRequest.model is an ImageModel object (or possibly a raw id);
 // the omni-gen REST body wants the string id.
 const modelIdOf = (model: unknown): string => {
@@ -177,8 +201,8 @@ export const useWebPageDrawAdapter = (): PageDrawAdapter => {
           model: modelIdOf(req.model),
           prompt: req.prompt ?? null,
           idempotency_token: crypto.randomUUID(),
-          aspect_ratio: req.aspectRatio ?? null,
-          resolution: req.imageResolution ?? null,
+          aspect_ratio: mapAspectRatio(req.aspectRatio) ?? null,
+          resolution: mapResolution(req.imageResolution) ?? null,
           image_batch_count: req.imageCount ?? 1,
           image_media_tokens: refTokens.length ? refTokens : null,
         };