Apply ui config styling to cancel cast prompt

[willyogo]

Summary

• apply ui_config-driven font, font color, and background color to the cancel cast confirmation dialog
• ensure discard and cancel buttons inherit configured font while keeping red discard background and semi-transparent gray cancel background
• pass systemConfig into discard prompt from navigation and mobile headers for consistent styling

Testing

• Not run (not requested)

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Codex Task

[vercel]

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Project	Deployment	Review	Updated (UTC)
space-system	Ready	Preview, Comment	Jan 1, 2026 0:02am

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