Update commands grid layout and impeccable command demo

Adds the three /impeccable usage modes (freeform, teach, craft) to the
command demo, with a clearer multi-pane layout. Also tightens the
commands grid spacing on the site and refreshes the framework viz and
glass terminal styles for consistency.

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

public/css/workflow.css

@@ -122,7 +122,7 @@
   display: grid;
   grid-template-columns: 38% 1fr;
   grid-template-rows: 1fr auto;
-  gap: 0 var(--spacing-xl);
+  gap: 0 var(--spacing-2xl);
   padding: var(--spacing-lg) var(--spacing-lg);
   opacity: 0;
   pointer-events: none;
@@ -342,6 +342,9 @@
   display: flex;
   align-items: center;
   justify-content: center;
+  max-width: 420px;
+  background: none;
+  min-height: auto;
 }
 
 /* (nav moved to fisheye list) */