fix: #3607228 Give the Latest News rail dark card text via a light view mode
Issue: https://www.drupal.org/project/horizonaid/issues/3607228
The Latest News rail on the Resources detail pages rendered white card text on its light bg-tertiary band: the latest_light view display shared the impressed_card_medium view mode with the home page's dark latest band, and that Canvas content template hardcodes text_color: text-white. Adds an impressed_card_medium_light twin (view mode + view display + Canvas content template, text-dark on heading/date/text) and points latest_light at it: the home dark band is untouched. Matches the Figma latest-updates-view: navy title, date and description on the light band. Verified live in a real browser on a Varbase 11 test site. Companion theme MR (tabs and CTA styling) on Vartheme BS5 Horizon Aid issue #3607230.
AI-Generated: This MR (code and description) was generated with Claude Code, reviewed and authorized by a human maintainer.
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