feat(firefox): finalize modular web-app profile with new-tab-override

- Integrated New Tab Override extension for reliable per-profile redirection.

- Confirmed Tridactyl compatibility via 'set newtab about:newtab'.

- Polished autohide toolbox with solid background.

apps/firefox/profiles/web-app.nix

@@ -77,19 +77,19 @@
 
     :root{
       /* Height of Tabs + Nav Bar approx 80px */
-      --uc-navbar-transform: -85px; 
+      --uc-navbar-transform: -85px;
       --uc-autohide-toolbar-delay: 0.1s;
       --uc-autohide-toolbar-duration: 200ms;
     }
     :root[uidensity="compact"]{ --uc-navbar-transform: -70px }
 
     #navigator-toolbox > div{ display: contents; }
-    
+
     /* Apply transform to TabsToolbar AND Nav-bar */
     :root[sessionrestored] :where(#nav-bar,#PersonalToolbar,#TabsToolbar,#tab-notification-deck,.global-notificationbox,#notifications-toolbar){
       transform: translateY(var(--uc-navbar-transform))
     }
-    
+
     :root:is([customizing],[chromehidden*="toolbar"]) :where(#nav-bar,#PersonalToolbar,#TabsToolbar,#tab-notification-deck,.global-notificationbox,#notifications-toolbar){
       transform: none !important;
       opacity: 1 !important;
@@ -156,7 +156,7 @@
       z-index: 10000;
       pointer-events: auto;
     }
-    
+
     /* When hitbox is hovered, reveal bars */
     #navigator-toolbox:hover :where(#nav-bar,#PersonalToolbar,#TabsToolbar) {
       transform: translateY(0) !important;
@@ -173,4 +173,5 @@
     #titlebar { appearance: none !important; }
     #PersonalToolbar { visibility: collapse !important; }
   '';
-}
+}
+