feat(ui): sweep remaining components for Deep Space consistency

Replace old design tokens and hardcoded colors across 29 files:
- bg-primary/text-primary-foreground -> bg-accent/text-white
- text-muted-foreground -> text-text-muted
- text-destructive/bg-destructive -> text-error/bg-error
- bg-muted -> bg-elevated (background usage)
- Hardcoded green/red/yellow/emerald/amber/slate -> semantic tokens
- Remove shadow-md/lg from cards, tooltips, topology nodes
- rounded-xl -> rounded-lg on cards/panels
- focus:ring-1 focus:ring-ring -> focus:border-accent on inputs

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

frontend/src/routes/_authenticated/tenants/$tenantId/devices/$deviceId.tsx

@@ -672,7 +672,7 @@ function DeviceDetailPage() {
 
             {/* Interface Utilization */}
             <div className="rounded-lg border border-border bg-surface p-4">
-              <h3 className="text-sm font-medium text-muted-foreground mb-3">Interface Utilization</h3>
+              <h3 className="text-sm font-medium text-text-muted mb-3">Interface Utilization</h3>
               <InterfaceGauges tenantId={tenantId} deviceId={deviceId} active={activeTab === 'overview'} />
             </div>