Add comprehensive mobile-first adjustments across the UI: reorganize topbar actions and context in Layout.vue, make the navigation drawer mobile-friendly (new mobile class, bottom location, density and block-button behavior), and add many responsive CSS rules. Introduce safe-area variables and larger touch targets in global.css (44px buttons, icon sizes, nav item heights), plus additional responsive patterns in page-layouts.css and surface-patterns.css. Apply mobile breakpoints and spacing/stacking tweaks to Home, Login, Impressum and 404 pages to ensure CTAs, cards and forms behave well on <=960px and <=600px viewports. Document the responsive implementation standard in GUI/style.md and update codexInfo.md to note the mobile/usability changes. Changes are scoped to mobile breakpoints to avoid desktop regressions.
Jonas
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