feat: add ticket workflow pages

frontend/src/components/app/AppEmptyState.tsx

@@ -0,0 +1,13 @@
+type AppEmptyStateProps = {
+  title: string
+  description?: string
+}
+
+export function AppEmptyState({ title, description }: AppEmptyStateProps) {
+  return (
+    <div className="rounded-lg border border-dashed border-border bg-surface px-4 py-8 text-center">
+      <p className="text-sm font-medium text-foreground">{title}</p>
+      {description ? <p className="mt-1 text-sm text-muted-foreground">{description}</p> : null}
+    </div>
+  )
+}

frontend/src/components/app/AppField.tsx

@@ -0,0 +1,15 @@
+import type * as React from 'react'
+
+type AppFieldProps = {
+  label: string
+  children: React.ReactNode
+}
+
+export function AppField({ label, children }: AppFieldProps) {
+  return (
+    <label className="grid gap-1.5">
+      <span className="text-xs font-medium text-muted-foreground">{label}</span>
+      {children}
+    </label>
+  )
+}