Restyle the UI: instrument-panel palette, type system, and a signal accent

Replaces the default shadcn grayscale/Geist look with a deliberate
identity built around the product's own subject - a control panel for
running scripts and watching their output live:

- Type: Bricolage Grotesque for page/card titles (via the existing
  --font-heading token, used with restraint), IBM Plex Sans for UI body
  text, IBM Plex Mono for technical data (run IDs, commands, timestamps,
  status labels) - all self-hosted at build time via next/font/google,
  no runtime CDN dependency for a self-hosted tool.
- Color: a cool graphite ink/paper base with a warm brass signal accent
  in both themes. The brass tone doubles as the "running" status color,
  so an active run literally lights the UI up with the brand color.
  New --status-* tokens give queued/running/succeeded/failed/cancelled/
  warn a single source of truth instead of ad-hoc Tailwind color classes.
- Structural language: small tracked-out uppercase mono labels mark
  technical fields (Command, Variables, Triggered by...) consistently;
  the live-output terminal gets an instrument-bezel frame (header bar +
  panel) instead of floating loose above the xterm canvas.

Layout/IA is unchanged throughout - this is a token- and detail-level
pass, not a restructuring.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

src/components/runs/xterm-view.tsx

@@ -10,9 +10,9 @@ export interface XtermViewHandle {
 }
 
 const theme = {
-  background: "#09090b",
-  foreground: "#f4f4f5",
-  cursor: "#f4f4f5",
+  background: "#101215",
+  foreground: "#edeef0",
+  cursor: "#e9a857",
   selectionBackground: "#3f3f46",
   black: "#18181b",
   red: "#f87171",
@@ -95,7 +95,7 @@ export const XtermView = forwardRef<XtermViewHandle, XtermViewProps>(
     return (
       <div
         ref={containerRef}
-        className="h-[60vh] overflow-hidden rounded-lg bg-zinc-950 p-2"
+        className="h-[60vh] overflow-hidden bg-[#101215] p-2"
       />
     );
   },