fix(plugin): always emit general.properties in generated project.json

[ShadowNineX]

Motivation

• Wallpaper Engine crashes when a project.json omits the general.properties block, so the plugin must always include it (even if empty) to produce compatible output.
• Preserve existing behavior for schemeColor, localization, and audio-processing detection while ensuring the top-level general block is consistently present.

Description

• Initialize generated properties to {} when none are configured and always include it on the general block in generateBundle by assigning project.general = general with general created as { properties }.
• Adjust the schemeColor preservation logic to read properties.schemecolor safely now that properties is always an object.
• Update unit tests in packages/wallpaper-engine/tests/plugin.test.ts to expect an empty general.properties record and extend workshop preservation tests in packages/wallpaper-engine/tests/workshop.test.ts to assert the same.
• Document the fix in CHANGELOG.md under the Unreleased section.

Testing

• Ran bun run --filter=wallpaper-engine test:run -- tests/plugin.test.ts and all plugin tests passed (54 passed).
• Ran the full package test suite with bun run --filter=wallpaper-engine test:run and all tests passed (301 passed).
• Ran bun run --filter=wallpaper-engine typecheck and typechecking succeeded.
• Ran bun run --filter=wallpaper-engine lint and the lint step failed due to an ESLint plugin runtime error (TypeError: mapTypes.union is not a function) in the environment, not related to these code changes.

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Codex Task

[chatgpt-codex-connector]

Codex Review Summary

This comment shows the latest Codex review activity on this pull request.

Review	Status	Commit	Review trigger
📝 Code Review	✅ Completed 2026-09-08T02:58:36.085367Z	242af52	PR opened
🔒 Security Review	✅ Completed 2026-09-08T03:00:42.947985Z	242af52	PR opened

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

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