fix(ui): prevent NavMenu logo from overlapping hamburger on mobile

On viewports ≤768px the burger button is position:fixed at the
viewport edge, while the header retained its default 1rem left
padding. The logo image therefore sat completely underneath the
button, causing a visible overlap on hover.

Increase .nav-header padding-left to 3.75rem on mobile so the
.nav-brand clears the 2.5rem fixed toggle with a 0.5rem gap.

Bump version → 1.10.6

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

compose.yaml

@@ -17,7 +17,7 @@ services:
       retries: 10
 
   bot:
-    image: git.codeanddice.ru/toutsu/gmrelay-bot:1.10.5
+    image: git.codeanddice.ru/toutsu/gmrelay-bot:1.10.6
     restart: always
     depends_on:
       db:
@@ -30,7 +30,7 @@ services:
       - gmrelay
 
   web:
-    image: git.codeanddice.ru/toutsu/gmrelay-web:1.10.5
+    image: git.codeanddice.ru/toutsu/gmrelay-web:1.10.6
     restart: always
     depends_on:
       db: