Add placeholder Billing surface (service + Help command)#8

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lordspline wants to merge 2 commits intomainfrom

capy/add-billing-14b3599d

Commits on Sep 3, 2025

Introduce a placeholder Billing surface with simple service and Help command to open a webview showing plan and usage. Enables demo flows without real billing integration.

lordspline
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capyai
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Chore: drop unused action category import/property in billing contribution to trim diff.

lordspline
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capyai
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