Road to No Explicit Any Part 6: Composables and Extensions (#8083)

## Summary
- Type `onExecuted` callbacks with `NodeExecutionOutput` in saveMesh.ts
and uploadAudio.ts
- Type composable parameters and return values properly
(useLoad3dViewer, useImageMenuOptions, useJobMenu, useResultGallery,
useContextMenuTranslation)
- Type `taskRef` as `TaskItemImpl` with updated test mocks
- Fix error catch and index signature patterns without `any`
- Add `NodeOutputWith<T>` generic helper for typed access to passthrough
properties on `NodeExecutionOutput`

## Test plan
- [x] `pnpm typecheck` passes
- [x] `pnpm lint` passes
- [x] Unit tests pass for affected files
- [x] Sourcegraph checks confirm no external usage of modified types

┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-8083-Road-to-No-Explicit-Any-Part-6-Composables-and-Extensions-2e96d73d3650810fb033d745bf88a22b)
by [Unito](https://www.unito.io)

src/composables/maskeditor/useBrushDrawing.ts

@@ -404,8 +404,9 @@ export function useBrushDrawing(initialSettings?: {
       device = root.device
       console.warn('✅ TypeGPU initialized! Root:', root)
       console.warn('Device info:', root.device.limits)
-    } catch (error: any) {
-      console.warn('Failed to initialize TypeGPU:', error.message)
+    } catch (error) {
+      const message = error instanceof Error ? error.message : String(error)
+      console.warn('Failed to initialize TypeGPU:', message)
     }
   }