Dark theme FAB: dark text (#0e1318) on bright accent background

White text on accent-color-primary was hard to see.
Dark body-bg color provides strong contrast.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/media/css/theme/dark.standard.css

@@ -830,7 +830,7 @@ color-scheme: dark;
 
 /* ===== THEME FAB ===== */
 --theme-fab-bg: var(--accent-color-primary, #3f8ff0);
---theme-fab-color: #fff;
+--theme-fab-color: #0e1318;
 
 /* ===== OFFLINE PAGE ===== */
 --offline-card-bg: rgba(0, 0, 0, 0.6);