IBX-12262: Added the product page component for add-on promotion and activation pages

[tischsoic]

Description

IBX-12262 introduces promotional and activation pages for Ibexa add-ons. Both page kinds share one layout and differ only in brand values, so the shared UI lands here and the pages themselves live in the packages that own them:

• ibexa/featured renders the promotional page for an add-on that is not enabled,
• ibexa/connector-qualifio and ibexa/connector-raptor render their own activation pages.

This PR adds the product_page component they all extend.

Templates — ui/component/product_page/:

• page.html.twig extends the admin layout and builds the two-column page (text column + brand panel with the illustration and the Discover band). Consumers set brand (qualifio or raptor), the copy variables and links, then fill {% block status %}, {% block details %} and {% block panel_overlay %}.
• banner.html.twig (add-on / dashboards teaser) and tile.html.twig (feature card) are included with already-translated strings, so every consumer keeps its own translation keys.

Styles — _product-page.scss: one ibexa-featured-free block, ibexa-product-page, with all brand differences expressed as custom properties on the --qualifio and --raptor modifiers (colours, tints, badge gradients, watermark geometry). Layout is shared: the text column has a 404px floor and does not shrink its children, the panel takes the remaining space and collapses its artwork below 460px via a container query.

Assets — img/brands/{qualifio,raptor}/: illustration, watermarks, brand icon (wrapped in a <symbol id="brand-icon"> so it can be used through the design system icon_url prop) and, for Raptor, the translucent cards overlay plus the badge-thumb icon that is missing from the icon sprite.

Dependent PRs

Consumers of this component (they cannot render without it):

• ibexa/featured — promotional pages
• ibexa/connector-raptor — Personalization activation page
• ibexa/connector-qualifio — Engagement activation page

Documentation

Not needed — internal component, no public API.

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[tischsoic]

Superseded by https://github.com/ibexa/admin-ui-extras/pull/12 — the product page component moves to ibexa/admin-ui-extras together with the brand assets; nothing lands in admin-ui for IBX-12262.