feat(launcher): render news.md in detail panel for news entry

Static 'coming soon' stub authored as Markdown with JSON-frontmatter
title. Loaded once on init, parsed via the same fm + md helpers as
modules. Live news (Gitea-API or RSS) deferred — single-source-of-
truth in the launcher repo keeps update-pace under our control.

news.md

@@ -0,0 +1,22 @@
+---
+{"title":"News","published":"2026-06-11"}
+---
+
+# Sporel News
+
+## Coming soon
+
+Live news will eventually appear here — release notes, mod-of-the-week,
+known-issue advisories. For now this is a static stub.
+
+## What works today
+
+- Master-detail launcher with per-module description + dep-status
+- Hero carousel with auto-rotate
+- Dep-conflict ambient-tint + launch-modal
+
+## What we are working on next
+
+- Live news source (Gitea-API or RSS-feed)
+- Module-categories filter (Game / Tool / Test)
+- Last-played persistence