fix(verification): close react-i18next compare gaps

[mstykow]

Summary

• preserve lowercase project-name copyright tails such as Copyright (c) 2015-present i18next while filtering bundled HTML-entity decoder regex junk out of copyright and holder detection
• descend into conditional if/else blocks inside Gradle dependency closures so React Native example apps keep static dependencies such as com.facebook.react:hermes-android
• record the verified i18next/react-i18next @ cb20d18 compare snapshot in docs/BENCHMARKS.md and regenerate the benchmark chart

Issues

• Covers: follow-up verification work for the CocoaPods row target i18next/react-i18next

Scope and exclusions

• Included:
  • copyright detector/refiner cleanup in src/copyright/** for lowercase project tails and HTML-entity decoder artifact suppression
  • Gradle parser improvement in src/parsers/gradle.rs for conditional dependency extraction inside dependencies { ... }
  • benchmark documentation update in docs/BENCHMARKS.md and docs/benchmarks/scan-duration-vs-files.svg
• Explicit exclusions:
  • no scorecard status change; the CocoaPods row was already marked verified before this follow-up
  • no broad URL-normalization rewrite for trailing-slash differences in README and Gradle wrapper docs

Intentional differences from Python

• This branch keeps concrete resolved dependency coordinates when static local values are available, such as resolved Flipper versions in the React Native examples, instead of preserving ${FLIPPER_VERSION} placeholders.
• Remaining compare deltas are limited to Unicode-preserving author normalization (Jan Mühlemann) and HTML-entity decoder test-noise patterns rather than meaningful parser blind spots.

Follow-up work

• Created or intentionally deferred:
  • deferred: broad trailing-slash URL normalization alignment for README and Gradle wrapper documentation links
  • deferred: further cleanup of HTML-entity decoder test-fixture noise, since the remaining deltas are in synthetic decoder assertions rather than real project metadata surfaces
  • compare artifacts:
    • baseline: .provenant/compare-runs/20260501T072233Z-react-i18next-43501
    • improved rerun: .provenant/compare-runs/20260501T082746Z-react-i18next-18917
  • validation run during implementation:
    • cargo test test_lowercase_project_name_after_present_year_range_is_kept
    • cargo test test_is_junk_copyright_drops_html_entity_regex_fragments
    • cargo test test_conditional_dependencies_inside_if_blocks_are_extracted
    • cargo test test_gradle_scan_resolves_buildsrc_kotlin_constants
    • cargo test tests::test_golden_copyrights --test copyright_golden --features golden-tests
    • cargo test tests::test_golden_summary_fixtures_match_expected_summary_blocks --test post_processing_golden --features golden-tests
    • cargo test test_scanner_detects_copyrights_in_windows_dll_strings --test scanner_integration
    • cargo test copyright::detector::tests_structured_metadata::
    • cargo test copyright::refiner::tests::