Redesign UI with new token system, primitives, and motion

Restraint-first design language: neutral gray surfaces + one blue accent
(cyan/amber/red reserved for state), 8pt spacing, softer radii, one
ambient + one raised shadow, standardized motion tokens. Alfa Slab One
demoted to BrandMark only; Inter carries all page copy.

New primitives (Button, Card, Badge, Stat, SectionHeader, Skeleton,
EmptyState, Tabs, Breadcrumbs, StatusPip, Field, Input, Select, Textarea)
plus motion utilities (tweenNumber, viewTransition) and a global toast
system. All eight route surfaces rewritten on top: Fleet gains an
overview hero, Server detail restructures into tabs, Deployments gets a
collapsible drift summary + per-server pipeline visual, and the
scripts/configs/plugins/betas flows adopt the new form primitives.

Sticky translucent nav with backdrop blur, view-transition cross-fades
between routes, staggered card entrance on Fleet, breathing status pip
halo, tabular-numeric player counts. Gmail-style g-key nav shortcuts.
Mobile stacks below 720px; prefers-reduced-motion neutralizes durations.
Legacy tokens preserved as aliases so any un-migrated code still renders.

src/lib/ui/toast.ts

@@ -0,0 +1,41 @@
+import { writable } from 'svelte/store';
+
+// Small global toast queue.
+//
+// Any part of the UI can drop a message and it appears in the corner for a
+// couple of seconds, then quietly dismisses. Replaces the ad-hoc "flash"
+// strings scattered across pages when the message doesn't need to live inline
+// with a form.
+
+export type ToastVariant = 'info' | 'success' | 'warning' | 'danger';
+
+export interface Toast {
+    id: number;
+    message: string;
+    variant: ToastVariant;
+    ttl: number;
+}
+
+export const toasts = writable<Toast[]>([]);
+
+let nextId = 1;
+
+export function toast(
+    message: string,
+    opts: { variant?: ToastVariant; ttl?: number } = {}
+): void {
+    const t: Toast = {
+        id: nextId++,
+        message,
+        variant: opts.variant ?? 'info',
+        ttl: opts.ttl ?? 3500
+    };
+    toasts.update((arr) => [...arr, t]);
+    if (t.ttl > 0) {
+        setTimeout(() => dismiss(t.id), t.ttl);
+    }
+}
+
+export function dismiss(id: number): void {
+    toasts.update((arr) => arr.filter((t) => t.id !== id));
+}