Fix Preset Data Loss in Import and Load (#429)

[google-labs-jules]

This PR fixes a bug where only the last preset in an imported file (or certain presets in config.ini) were being saved, leading to data loss.

Changes:

• Core Logic: Introduced FinalizePreset in Config.cpp to unify the logic for finishing a preset parse (migration, validation, name collision handling, and pushing to the internal list).
• Parsing Fix: Updated the loops in LoadPresets and ImportPreset to ensure FinalizePreset is called whenever a new section header is encountered or the end of the file is reached.
• Testing: Added tests/test_issue_429_repro.cpp which covers multi-preset loading and importing scenarios.
• Metadata: Incremented version to 0.7.209 and added detailed entry to CHANGELOG_DEV.md.

Verification:

• All 576 tests pass on Linux (Headless).
• Specifically verified test_issue_429_repro_load and test_issue_429_repro_import pass.
• Verified test_executable_metadata correctly identifies version 0.7.209.

This fix ensures that user-tuned FFB settings are reliably preserved across sessions and imports.

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PR created automatically by Jules for task 2870842054987853878 started by @coasting-nc

[google-labs-jules]

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[github-actions]

Dependency Review

✅ No vulnerabilities or license issues or OpenSSF Scorecard issues found.

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