fix: enforce managed playwright use defaults

[exKAZUu]

Customer Summary

• wbfy now updates the managed Playwright use.trace, use.screenshot, and use.video settings even when those fields already exist in playwright.config.ts.
• Existing non-managed Playwright settings remain preserved, so local project-specific config is not broadly overwritten.

Technical Summary

• Split default config creation from merging in packages/wbfy/src/fixers/playwrightConfig.ts.
• Added a focused post-merge step that overwrites only the managed use artifact settings from the generated defaults.
• Kept the existing merge behavior for other top-level and nested Playwright config fields.

Why

• The previous recursive merge treated existing use values as local overrides, so wbfy only backfilled missing artifact settings and did not normalize stale values.
• A targeted post-merge normalization fixes the reported behavior without making wbfy overwrite unrelated Playwright customization.

Testing

• yarn verify
• Pre-commit cleanup hook passed.
• Pre-push lint hook passed.

Notes

• No tests were added because this repository's local instructions say to write tests only when explicitly requested.

[gemini-code-assist]

Code Review

This pull request updates the Playwright configuration fixer in packages/wbfy/src/fixers/playwrightConfig.ts by introducing a new helper function applyManagedUseDefaults. This function ensures that specific default settings for trace, screenshot, and video are consistently applied to the merged configuration, overriding any local adjustments. No review comments were provided, and the changes align with the repository's coding standards.

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