feat: Add Cross-Lingual Semantic Alignment & Drift Visualizer

[scheuclu]

Description

Enable users to map how semantic concepts align or drift across languages (e.g. comparing "apple", "manzana", "apfel" in a shared multilingual vector space).

Implementation Checklist

• Model Selection & Precomputation:
  • Use a multilingual sentence/word model (e.g. sentence-transformers/LaBSE or multilingual-e5-small) to generate aligned vectors for a shared lexicon (~1,000 common concepts in English, Spanish, French, German).
  • Project the joint vectors to a shared 2D coordinate space using UMAP.
• Frontend Interface:
  • Create a /multilingual route that shows a dual-galaxy or overlay view of languages.
  • Highlighting a word in English automatically draws connection lines to its translation equivalents in other languages, showing the distance/drift (e.g., "compromise" in English might sit differently from "compromiso" in Spanish due to cultural variations).