Reverts the full-bleed background-banner desktop hero. Desktop uses
a 1.4fr / 1fr grid: image column gets the heavier ratio so the 16:9
landscape source has room for its full composition; copy + items +
purchase cluster sits in the right column. Back button stays in its
own row above the hero on every viewport — no overlay.
BundleCard now uses RouterLink for internal hrefs (was rendering a
plain <a>, which triggered a hard navigation and lost vue-router's
saved scroll position when the user hit back from a bundle page).
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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