Fix double nested container on dropdown/select menus

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Summary

• fixed dropdown/select/filter menus rendering with an extra nested container shell
• applied the fix centrally in Harmony Menu so web and mobile-web menus share consistent rendering

Root Cause

Popup now renders its own bordered shell, while Menu content is wrapped in a bordered Paper. This caused two stacked containers for a single menu.

Fix

• updated packages/harmony/src/components/internal/Menu.tsx to render Popup with shadow='flat'
• added packages/harmony/src/components/internal/Menu.module.css and applied it to the popup wrapper to make the outer shell transparent/no border
• preserved the existing inner Paper shell for menu border/shadow styling

Validation

• attempted targeted typecheck for @audius/harmony, but local toolchain is missing tsc in this environment (tsc: not found)
• code compiles logically and changes are scoped to shared menu shell rendering

  

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