fix(index): extract magic numbers 50 and 30 to named constants

[poyrazK]

Summary

• Extract hardcoded 50 and 30 in extract_highlight() to named constants HIGHLIGHT_PRE_CONTEXT_CHARS and HIGHLIGHT_POST_CONTEXT_CHARS
• Fixes issue extract_highlight: magic numbers 50 and 30 not extracted to named constants #86

Test plan

• cargo test --package cloudsearch-index -- highlight_positions_case_insensitive — passes
• cargo clippy --package cloudsearch-index --all-targets — clean

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

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Run ID: 09762969-7c4e-43cf-a2f9-20fe767c7ac7

📥 Commits

Reviewing files that changed from the base of the PR and between 9ce969a and 6488dac.

📒 Files selected for processing (1)

• rust/crates/cloudsearch-index/src/lib.rs

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/extract-highlight-magic-numbers

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[poyrazK]

It's okay to merge