Add more details to fuzzy inverted index explanations

[Tekrunner]

Add:

• Details on how TF-IDF is calculated
• Same for edit bonus
• Same for the total score of a document
• More explanation for the "Inspect a document's score breakdown" visual (the visual apparently shows IDF without explaining what that is)

[Tekrunner]

@codex

[chatgpt-codex-connector]

Summary

• Expanded the Stage 3 explainer to detail how overlap, TF-IDF, the edit bonus, and the combined total score are computed for each query. apps/fuzzy_inverted_index/main.pyL323-L333
• Added guidance clarifying that the contribution breakdown visual represents each fragment’s overlap × IDF contribution and how to interpret the hover metadata. apps/fuzzy_inverted_index/main.pyL344-L351

Testing

• ✅ timeout 15s streamlit run apps/fuzzy_inverted_index/main.py --server.headless true --server.port 8502

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