feat: Sprint 4 complete — frontend MVP (admin dashboard + member portal)

Shadboard starter-kit (Next.js 15 + React 19 + shadcn/ui + Tailwind 4)

Sprint 4.a — Admin Dashboard:
- Auth: NextAuth.js v5, login page, middleware, token rotation
- Dashboard: KPI cards, Recharts stock chart, quick actions
- Members: TanStack Table (search/sort/paginate), add/edit forms
- Distributions: multi-step form, real-time quota check, history
- Stock: batch management, recall dialog, bar chart
- Reports: monthly/member-list/recall, PDF/CSV download, preview

Sprint 4.b — Member Portal:
- Separate route group with top-nav layout (mobile-first)
- Quota dashboard with radial SVG progress indicators
- Distribution history with month filter
- Profile/settings with password change

Cross-cutting:
- i18n: German (default) + English via next-intl
- Dark + light mode (next-themes, user-togglable)
- Playwright E2E tests (6/6 green)
- Docker multi-stage build (node:22-alpine)
- API proxy via Next.js rewrites

Tech: Next.js 15.2.8, React 19, Tailwind 4, NextAuth v5,
TanStack Table, Recharts, Zod, React Hook Form, Playwright

cannamanage-frontend/src/contexts/settings-context.tsx

@@ -0,0 +1,70 @@
+"use client"
+
+import { createContext, useCallback, useEffect, useState } from "react"
+import { useCookie } from "react-use"
+
+import type { LocaleType, SettingsType } from "@/types"
+import type { ReactNode } from "react"
+
+export const defaultSettings: SettingsType = {
+  theme: "zinc",
+  mode: "dark",
+  radius: 0.5,
+  layout: "vertical",
+  locale: "de",
+}
+
+export const SettingsContext = createContext<
+  | {
+      settings: SettingsType
+      updateSettings: (newSettings: SettingsType) => void
+      resetSettings: () => void
+    }
+  | undefined
+>(undefined)
+
+export function SettingsProvider({
+  locale,
+  children,
+}: {
+  locale: LocaleType
+  children: ReactNode
+}) {
+  const [storedSettings, setStoredSettings, deleteStoredSettings] =
+    useCookie("settings")
+  const [settings, setSettings] = useState<SettingsType | null>(null)
+
+  useEffect(() => {
+    if (storedSettings) {
+      setSettings(JSON.parse(storedSettings))
+    } else {
+      setSettings({ ...defaultSettings, locale })
+    }
+  }, [storedSettings, locale])
+
+  const updateSettings = useCallback(
+    (newSettings: SettingsType) => {
+      setStoredSettings(JSON.stringify(newSettings))
+      setSettings(newSettings)
+    },
+    [setStoredSettings]
+  )
+
+  const resetSettings = useCallback(() => {
+    deleteStoredSettings()
+    setSettings(defaultSettings)
+  }, [deleteStoredSettings])
+
+  // Render children only when settings are ready
+  if (!settings) {
+    return null
+  }
+
+  return (
+    <SettingsContext.Provider
+      value={{ settings, updateSettings, resetSettings }}
+    >
+      {children}
+    </SettingsContext.Provider>
+  )
+}