WEB-4603 Use redemption redirect URLs in SDK-rendered QR codes

[nicfix]

Motivation

WEB-4603

purchases-js already exposes the alternative HTTP(S) redemption URL introduced for WEB-4553, but its bundled purchases-ui-js version does not use that URL when rendering redemption QR codes.

Description

Update @revenuecat/purchases-ui-js from 4.8.16 to 4.8.18.

The updated UI package:

• Uses the alternative HTTP(S) redemption URL for Redemption Button QR codes when available.
• Falls back to the existing custom-scheme URL when the alternative URL is missing or empty.
• Keeps direct mobile redemption on the existing custom-scheme URL.

This changes only the QR-code path for SDK-rendered paywalls. Existing integrations that do not receive the alternative URL retain their current behavior.

Related changes:

• UI: RevenueCat/purchases-ui-js#369
• Funnels runtime: RevenueCat/rc-workflows#286
• Original customer issue: WEB-4553

[RevenueCat-Danger-Bot]

	1 Error
🚫	Label the PR using one of the change type labels. If you are not sure which label to use, choose pr:other.

Label	Description
pr:feat	A new feature. Use along with pr:breaking to force a major release.
pr:fix	A bug fix. Use along with pr:force_minor to force a minor release.
pr:other	Other changes. Catch-all for anything that doesn't fit the above categories. Releases that only contain this label will not be released. Use along with pr:force_patch, or pr:force_minor to force a patch or minor release.
pr:RevenueCatUI	Use along any other tag to mark a PR that only contains RevenueCatUI changes
pr:next_release	Preparing a new release
pr:dependencies	Updating a dependency
pr:phc_dependencies	Updating purchases-hybrid-common dependency
pr:changelog_ignore	The PR will not be included in the changelog. This label doesn't determine the type of bump of the version and must be combined with pr:feat, pr:fix or pr:other.

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