fix(web): align replay and landing page to Terminal (base16-eighties) palette

Replay viewer was using the old midnight-purple palette. Both pages now
use the exact color tokens from ui_theme.rs — matching the desktop and
Android app exactly.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

solitaire_server/web/home.html

@@ -14,7 +14,7 @@
             --bg:         #151515;
             --panel:      #202020;
             --panel-hi:   #2a2a2a;
-            --border:     rgba(255,255,255,0.07);
+            --border:     #353535;
             --text:       #d0d0d0;
             --text-muted: #a0a0a0;
             --accent:     #a54242;