feat!: add close label prop

[adefreitas]

Summary by cubic

Add optional onCloseLabel prop to Hub, StackOneHub, IntegrationPicker, and SuccessCardFooter to customize the Close button text on success.
BREAKING: remove onCancel (including from StackOneHubProps); use onCloseLabel to set the label, default remains "Close".

^{Written for commit 02263ff. Summary will update on new commits.}

[cubic-dev-ai]

No issues found across 3 files

[Copilot]

Pull request overview

This PR adds support for customizing the “Close” button label shown in the integration picker success footer by plumbing a new onCloseLabel prop down to SuccessCardFooter.

Changes:

• Add optional onCloseLabel prop to Hub and IntegrationPicker.
• Extend SuccessCardFooter to accept onCloseLabel and render it (fallbacking to "Close").
• Remove onCancel from HubProps / IntegrationPickerProps in the updated components.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 2 comments.

File	Description
src/modules/integration-picker/IntegrationPicker.tsx	Accepts onCloseLabel and passes it to the success footer.
src/modules/integration-picker/components/successCardFooter.tsx	Renders customizable close button label via onCloseLabel ?? 'Close'.
src/Hub.tsx	Adds onCloseLabel to HubProps and forwards it to IntegrationPicker; removes onCancel from props.

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