fix: respect override for submit_label in Confirm.Input component

[nallwhy]

Problem

The Confirm.Input component's submit_label ignored user-configured overrides.
Setting set :submit_label, "Verify Email" (or any custom value) in an override
module had no effect — the component always returned the hardcoded default
("Confirm Your {field}").

Fix

Check override_for/2 first and fall back to the default only when no override is set:

|> assign_new(:submit_label, fn ->
  fn strategy ->
    override_for(assigns.overrides, :submit_label) ||
      humanize("confirm your #{Enum.at(strategy.monitor_fields, 0)}")
  end
end)

[Copilot]

Pull request overview

This pull request fixes a bug in the Confirm.Input component where the submit_label property ignored user-configured overrides. Previously, the component always returned a hardcoded default label ("Confirm Your {field}"), even when users set custom values via override modules.

Changes:

• Modified submit_label assignment to check for overrides first before falling back to the default humanized value
• Aligns the Confirm.Input component with the override pattern used consistently across other components like MagicLink.Input

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