The Add Source card links to a connector's docs, but the API-key
connect dialog did not, so a user filling in an API key had no path
to the setup instructions. Add a "Documentation" button to the dialog
footer, styled like Cancel and on the left of the Cancel/Connect row,
shown only when the provider has a docs page.
Extract the rendering into a shared ConnectorDocumentationLink
component with a link/button variant (the card keeps the quiet link,
the dialog uses the button) and give DialogFooter an optional start
slot for left-aligned footer content.
Signed-off-by: Aurélien Sibiril <81782+aureliensibiril@users.noreply.github.com>
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