Add custom dictionary import and export

[altic-dev]

Description

Adds JSON import/export for the complete Custom Dictionary: Instant Replacement rules plus Custom Words. Also refreshes the Custom Dictionary screen so Import/Export are visible in the header and local build_* helper files stay ignored.

Type of Change

• 🐞 Bug fix (non-breaking change which fixes an issue)
• ✨ New feature (non-breaking change which adds functionality)
• 💥 Breaking change (fix or feature that would cause existing functionality to not work as expected)
• 🧹 Chore
• 📝 Documentation update

Related Issues

• Closes [✨ FEATURE] Please implement a way to import and export the complete dictionary as a JSON file. #425

Testing

• Tested on Intel Mac
• Tested on Apple Silicon Mac
• Tested on macOS 26
• Ran linter locally: swiftlint --strict --config .swiftlint.yml Sources
• Ran formatter locally: swiftformat --config .swiftformat Sources
• Built and installed locally with sh build_with_FI_incremental.sh

Notes

• Import supports merge or replace.
• Export uses a simple JSON format with replacement rules and custom words.

Screenshots / Video

Not attached.

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

💡 Codex Review

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Reviewed commit: c14b760ecc

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