v6.8.1: the downloads point at desktop 1.0.3

Desktop 1.0.3 fixes video on a call placed after a group call — the two shared
one peer connection, the second call opened a second video section, and the two
H264 profiles collided, so the call carried sound and no picture. It also ships
the STUN and TURN list this client uses, which is what lets a browser and a
desktop agree on a path instead of one of them offering no relay at all.

The version lives in two places on this side (the landing page and the download
grid), and the consistency test also reads the README badge, the changelog and
the cryptography document, so all of them move together.

Riding along: the group status dot now takes its colour from the theme in the
call and group views, which is what the desktop's copy of groupsStore.js was
compared against.

Claude-Session: https://claude.ai/code/session_019RCW2Fm7dkAaU2zeHDksei

sw.js

@@ -11,7 +11,7 @@ let DYNAMIC_CACHE = 'securebit-pwa-dynamic-v4.7.56';
 // Build stamp — rewritten by scripts/post-build.js on every release so this file's
 // bytes change each deploy. That is what makes the browser detect a new Service Worker,
 // reinstall it, drop stale caches and (via controllerchange) prompt the page to update.
-const SW_BUILD_VERSION = '1788557187846';
+const SW_BUILD_VERSION = '1789181644117';
 
 // Locale subdirectories, rewritten by scripts/build-i18n.js. Each localized page is a
 // separate document at its own URL, so the shell has to be cached and served per