[1.8] refactor(embeddings): type extractor with FeatureExtractionPipeline

[h4yfans]

Summary

Replaces the let extractor: any = null escape hatch in apps/desktop/src/main/lib/embeddings.ts with the real FeatureExtractionPipeline type imported from @huggingface/transformers, removing the file's only eslint-disable @typescript-eslint/no-explicit-any directive.

pipeline('feature-extraction', ...) returns a large discriminated union that TypeScript reports as "too complex to represent". The return is routed through unknown (not any) and cast once to the concrete pipeline type — keeping the module-level extractor strongly typed at every call site.

Before / After

-// Pipeline instance (lazy loaded)
-// eslint-disable-next-line @typescript-eslint/no-explicit-any
-let extractor: any = null
+let extractor: FeatureExtractionPipeline | null = null

And inside initEmbeddingModel():

-extractor = await pipeline('feature-extraction', MODEL_NAME, { ... })
+const loaded: unknown = await pipeline('feature-extraction', MODEL_NAME, { ... })
+extractor = loaded as FeatureExtractionPipeline

generateEmbedding() now calls a locally-typed extractorInstance (same narrowed reference) rather than re-reading the module variable after the initEmbeddingModel() call.

Verification

• pnpm --filter @memry/desktop typecheck:node 2>&1 | grep "embeddings.ts" | wc -l = 0
• rg ": any|as any" apps/desktop/src/main/lib/embeddings.ts = no matches
• pnpm --filter @memry/desktop typecheck:web = pass
• pnpm typecheck:packages = pass (10/10 cached)
• pnpm exec eslint --cache src/main/lib/embeddings.ts = 0 errors, 0 warnings
• pnpm test = 2 failures, both pre-existing and unrelated:
  • calendar-page.test.tsx:258 "Due draft" (known flake, ignored per unit instructions)
  • notes-tree.test.tsx T523 — reproduces on clean main without this change (@/components/kibo-ui/tree alias resolution issue in local env)

Test plan

• typecheck:node clean for touched file
• typecheck:web clean
• typecheck:packages clean
• No any remaining in embeddings.ts
• No new lint errors in touched file
• Smoke embedding generation in dev app (manual follow-up)