feat: add model-to-node mappings for new node packs

Add entries to MODEL_NODE_MAPPINGS for model directories that need
UI backlinks so the 'Use' button works in the model browser.

- background_removal -> LoadBackgroundRemovalModel (ComfyUI core)
- frame_interpolation -> FrameInterpolationModelLoader (ComfyUI core)
- film -> FILM VFI (ComfyUI-Frame-Interpolation)

Each loader was verified against the upstream node's INPUT_TYPES.
Test coverage extended in modelToNodeStore.test.ts.

ultralytics/bbox and ultralytics/segm intentionally left unmapped
to preserve the fix from #12075 (BE-689) — cloud-side asset metadata
fixes need to land first.

src/platform/assets/mappings/modelNodeMappings.ts

@@ -197,5 +197,18 @@ export const MODEL_NODE_MAPPINGS: ReadonlyArray<
   ['mediapipe', 'LivePortraitLoadMediaPipeCropper', ''],
 
   // ---- Superprompt text enhancement ----
-  ['superprompt-v1', 'Superprompt', '']
+  ['superprompt-v1', 'Superprompt', ''],
+
+  // ---- Background removal (ComfyUI core) ----
+  ['background_removal', 'LoadBackgroundRemovalModel', 'bg_removal_name'],
+
+  // ---- Frame interpolation (ComfyUI core) ----
+  ['frame_interpolation', 'FrameInterpolationModelLoader', 'model_name'],
+
+  // ---- FILM VFI (ComfyUI-Frame-Interpolation) ----
+  ['film', 'FILM VFI', 'ckpt_name']
+
+  // NOTE: ultralytics/bbox + ultralytics/segm intentionally NOT registered
+  // here. Tracked in BE-689 — re-enable only after cloud-side fixes land
+  // (tag lookup + submitted value mismatch). See PR #12075.
 ] as const satisfies ReadonlyArray<readonly [string, string, string]>

src/stores/modelToNodeStore.test.ts

@@ -38,7 +38,10 @@ const EXPECTED_DEFAULT_TYPES = [
   'segformer_b3_fashion',
   'nlf',
   'FlashVSR',
-  'FlashVSR-v1.1'
+  'FlashVSR-v1.1',
+  'background_removal',
+  'frame_interpolation',
+  'film'
 ] as const
 
 type NodeDefStoreType = ReturnType<typeof useNodeDefStore>
@@ -87,7 +90,10 @@ const MOCK_NODE_NAMES = [
   'IPAdapterModelLoader',
   'LS_LoadSegformerModel',
   'LoadNLFModel',
-  'FlashVSRNode'
+  'FlashVSRNode',
+  'LoadBackgroundRemovalModel',
+  'FrameInterpolationModelLoader',
+  'FILM VFI'
 ] as const
 
 const mockNodeDefsByName = Object.fromEntries(
@@ -261,7 +267,10 @@ describe('useModelToNodeStore', () => {
       ['FlashVSR', 'FlashVSRNode', ''],
       ['FlashVSR-v1.1', 'FlashVSRNode', ''],
       ['segformer_b2_clothes', 'LS_LoadSegformerModel', 'model_name'],
-      ['segformer_b3_fashion', 'LS_LoadSegformerModel', 'model_name']
+      ['segformer_b3_fashion', 'LS_LoadSegformerModel', 'model_name'],
+      ['background_removal', 'LoadBackgroundRemovalModel', 'bg_removal_name'],
+      ['frame_interpolation', 'FrameInterpolationModelLoader', 'model_name'],
+      ['film', 'FILM VFI', 'ckpt_name']
     ])(
       'should return correct provider for %s',
       (modelType, expectedNodeName, expectedKey) => {