v1.2.0

Fixes the Sveltia CMS admin interface, which was completely broken (blank page, then a rejected config) after an upstream package rename — and adds custom branding to it.

• fix: Sveltia CMS admin never rendered (blank page) — admin/index.html pointed at the old unscoped sveltia-cms npm package, which no longer exists (renamed to @sveltia/cms); also loaded the ESM build with type="module", but the package's own docs specify the plain, non-module dist/sveltia-cms.js. Fixed and pinned to @sveltia/cms@0.211.2
• fix: once the CMS loaded, it rejected config.yml — published_date's widget: date is deprecated/unsupported in Sveltia CMS. Changed to widget: datetime, type: date (outputs the same plain YYYY-MM-DD)
• feat: branded the CMS admin — app_title: Outside the Boxplot Admin replaces "Sveltia CMS" on the login screen and browser tab; logo.src set to /favicon.svg (the hardcoded-color one, not logo-mark.svg's currentColor version, since Sveltia loads it standalone) — appears on the login page, admin header, and browser tab favicon while in the admin