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/app/(app)/page.tsx

@@ -13,21 +13,31 @@ export default function DashboardPage() {
 
   if (config.scripts.length === 0) {
     return (
-      <div className="text-muted-foreground py-24 text-center">
-        No scripts configured yet. Add entries under{" "}
-        <code className="bg-muted rounded px-1.5 py-0.5">scripts:</code> in your
-        config file.
+      <div className="flex flex-col items-center gap-2 py-24 text-center">
+        <PlayCircle className="text-muted-foreground/50 mb-2 size-8" />
+        <h1 className="font-heading text-lg font-semibold tracking-tight">
+          No scripts yet
+        </h1>
+        <p className="text-muted-foreground max-w-sm text-sm">
+          Add entries under{" "}
+          <code className="bg-muted rounded px-1.5 py-0.5 font-mono text-xs">
+            scripts:
+          </code>{" "}
+          in your config file to see them here.
+        </p>
       </div>
     );
   }
 
   return (
     <div className="flex flex-col gap-4">
-      <h1 className="text-2xl font-semibold tracking-tight">Scripts</h1>
+      <h1 className="font-heading text-2xl font-semibold tracking-tight">
+        Scripts
+      </h1>
       <div className="grid gap-3 sm:grid-cols-2">
         {config.scripts.map((script) => (
           <Link key={script.id} href={`/scripts/${script.id}`}>
-            <Card className="hover:border-foreground/30 h-full transition-colors">
+            <Card className="hover:border-primary/50 h-full transition-colors">
               <CardHeader className="flex flex-row items-start justify-between gap-2 space-y-0">
                 <div className="flex items-center gap-2">
                   <PlayCircle className="text-muted-foreground size-4.5 shrink-0" />