feat: implement admin login form localization, add import functionality, and enhance file handling

frontend/public/Beispiel.csv

@@ -0,0 +1,40 @@
+a7B9-kD3f-92Lm-Q1z
+Z1x9-3kLp-a8D2-mN7
+pQ4d-T7v2-bK9X-f5G
+m3N8-wQ2z-V6bP-tR4
+gH7k-Lp2Q-xD5f-sE9
+R8tV-c2Bq-J7mZ-yK1
+nK5w-D9sP-T3vL-rU6
+Y4dE-q7Wm-hP2k-Js9
+c2Fh-X8nR-L5vq-tG7
+bM6x-pQ3Z-s7Kf-U1h
+V9cQ-h3Tn-2KxF-z6P
+k5Lr-M8pQ-w2Tg-Y9d
+H2sN-v7Qb-c4XK-p8J
+q8Wk-R5nD-1zLp-G6y
+T7bH-y2Kq-M9vF-c3R
+j4Dq-P6sL-t8XG-r1V
+F6kP-q1Xv-3TzB-n7H
+x9Nf-L2dQ-5vHk-S8p
+G3rH-t9Kc-Q4sV-m1Z
+s1Vx-B7mQ-8kDt-P5g
+P5kZ-w4Sg-2HnV-y9M
+L8cJ-q3Vt-7pXh-D2f
+d7Xv-T1kL-6mQp-R8s
+K2nP-z6Hq-9vBd-J3t
+u9Hc-R4sV-5kLm-Q2x
+N3vG-y8Kp-1TqD-s6F
+h5Qm-C9tB-4vXn-Z7k
+W6zF-p2Jc-8KqH-d1L
+r2Kp-G5sN-7tVh-M4q
+J4mT-x9Hc-2QvP-k8S
+f8Pq-D3kV-6zLn-R1y
+Q7zD-h1Sg-9KpM-t4V
+z6Kx-P5vH-1cQn-Y8d
+C9tB-u4Hq-7mKs-p2J
+y1Vd-G7nP-3kLq-S6h
+M2cL-t5Xh-9vQp-r8K
+b4Sg-N6kP-2HqV-J9t
+X5nV-q8Tz-1pKd-L3h
+e3Kq-R7vH-5nXc-P2m
+H1pM-w9Dk-4sQv-T7g

frontend/src/components/CircleUpload.tsx

@@ -0,0 +1,97 @@
+import React, { useRef, useState, useCallback } from "react";
+
+type CircleUploadProps = {
+  onFiles?: (files: File[]) => void;
+  accept?: string;
+  multiple?: boolean;
+};
+
+const CircleUpload: React.FC<CircleUploadProps> = ({
+  onFiles,
+  accept = "",
+  multiple = true,
+}) => {
+  const [isDragging, setIsDragging] = useState(false);
+  const [files, setFiles] = useState<File[]>([]);
+  const inputRef = useRef<HTMLInputElement | null>(null);
+
+  const processFiles = useCallback(
+    (fileList: FileList | null) => {
+      if (!fileList) return;
+      const arr = Array.from(fileList);
+      setFiles(arr);
+      onFiles?.(arr);
+    },
+    [onFiles]
+  );
+
+  const openFileDialog = () => inputRef.current?.click();
+
+  const handleDrop = (e: React.DragEvent) => {
+    e.preventDefault();
+    e.stopPropagation();
+    setIsDragging(false);
+    processFiles(e.dataTransfer.files);
+  };
+
+  const handleDrag = (e: React.DragEvent) => {
+    e.preventDefault();
+    e.stopPropagation();
+    if (e.type === "dragenter" || e.type === "dragover") setIsDragging(true);
+    else if (e.type === "dragleave") setIsDragging(false);
+  };
+
+  return (
+    <div className="flex flex-col items-center space-y-3">
+      <div
+        role="button"
+        tabIndex={0}
+        onClick={openFileDialog}
+        onKeyDown={(e) =>
+          (e.key === "Enter" || e.key === " ") && openFileDialog()
+        }
+        onDrop={handleDrop}
+        onDragEnter={handleDrag}
+        onDragOver={handleDrag}
+        onDragLeave={handleDrag}
+        className={[
+          "w-48 h-48 rounded-full border-2 border-dashed flex flex-col items-center justify-center text-center px-4 transition-colors cursor-pointer select-none",
+          "border-blue-400 text-blue-500 bg-blue-50/40 hover:bg-blue-50",
+          isDragging && "bg-blue-100 border-blue-500",
+        ].join(" ")}
+      >
+        <span className="text-sm font-medium">
+          Dateien hierher ziehen
+          <br />
+          <span className="text-xs text-gray-500">oder klicken</span>
+        </span>
+        <span className="mt-2 inline-block rounded bg-blue-600 text-white text-xs px-2 py-1">
+          Upload
+        </span>
+        <input
+          ref={inputRef}
+          type="file"
+          className="hidden"
+          accept={accept}
+          multiple={multiple}
+          onChange={(e) => processFiles(e.target.files)}
+        />
+      </div>
+
+      {files.length > 0 && (
+        <ul className="w-56 max-h-32 overflow-auto text-xs bg-gray-50 border rounded p-2 space-y-1">
+          {files.map((f) => (
+            <li key={f.name} className="truncate">
+              {f.name}{" "}
+              <span className="text-gray-400">
+                ({Math.round(f.size / 1024)} KB)
+              </span>
+            </li>
+          ))}
+        </ul>
+      )}
+    </div>
+  );
+};
+
+export default CircleUpload;

frontend/src/components/ImportGUI.tsx

@@ -0,0 +1,83 @@
+import React from "react";
+import CircleUpload from "./CircleUpload";
+import { CircleX } from "lucide-react";
+
+type ImportGUIProps = {
+  onClose: () => void;
+};
+
+const ImportGUI: React.FC<ImportGUIProps> = ({ onClose }) => {
+  return (
+    <div className="fixed inset-0 z-50 flex items-start justify-center pt-24">
+      {/* Backdrop */}
+      <div className="absolute inset-0 bg-black/40 backdrop-blur-sm" />
+
+      {/* Dialog Panel */}
+      <div className="relative z-10 w-11/12 max-w-lg rounded-2xl border border-black/10 bg-white/95 p-6 shadow-xl ring-1 ring-black/5">
+        <div className="flex items-start justify-between gap-4">
+          <div>
+            <h2 className="text-xl font-extrabold tracking-tight text-zinc-900">
+              Losnummern importieren
+            </h2>
+            <p className="mt-1 text-sm text-zinc-600 leading-relaxed">
+              Importieren Sie Losnummern als strukturierte Datei. Unterstützte
+              Formate:
+            </p>
+            <div className="mt-2 flex flex-wrap gap-2">
+              {[".csv"].map((fileFormat) => (
+                <span
+                  key={fileFormat}
+                  className="inline-flex items-center rounded-full border border-black/10 bg-zinc-100 px-3 py-0.5 text-xs font-medium text-zinc-700 shadow-inner"
+                >
+                  {fileFormat}
+                </span>
+              ))}
+            </div>
+            <a href="/Beispiel.csv" download>
+              <button className="inline-flex justify-center rounded bg-zinc-300 px-1 py-1 text-xs text-zinc-800 shadow transition hover:bg-zinc-400 active:bg-zinc-500">
+                Beispiel (Download)
+              </button>
+            </a>
+          </div>
+          <button
+            type="button"
+            onClick={onClose}
+            className="group rounded-full p-1.5 text-zinc-500 transition hover:bg-zinc-200/70 hover:text-zinc-700 active:scale-95"
+            aria-label="Schließen"
+          >
+            <CircleX className="h-6 w-6" strokeWidth={2.25} />
+          </button>
+        </div>
+
+        <div className="mt-6">
+          <CircleUpload accept=".csv" />
+        </div>
+
+        {/* Placeholder for optional file summary / mapping UI */}
+        <div className="mt-6 hidden rounded-xl border border-dashed border-black/15 bg-zinc-50/60 p-4 text-center text-xs text-zinc-500">
+          Ausgewählte Dateien werden hier aufgelistet.
+        </div>
+
+        {/* Actions */}
+        <div className="mt-8 flex flex-col-reverse gap-3 sm:flex-row sm:justify-end">
+          <button
+            type="button"
+            onClick={onClose}
+            className="inline-flex justify-center rounded-xl bg-zinc-300 px-5 py-3 text-sm font-bold text-zinc-800 shadow transition hover:bg-zinc-400 active:bg-zinc-500"
+          >
+            Abbrechen
+          </button>
+          <button
+            type="button"
+            className="inline-flex justify-center rounded-xl bg-blue-600 px-6 py-3 text-sm font-bold text-white shadow transition hover:bg-blue-700 active:bg-blue-800 disabled:opacity-60 disabled:cursor-not-allowed"
+            disabled
+          >
+            Importieren
+          </button>
+        </div>
+      </div>
+    </div>
+  );
+};
+
+export default ImportGUI;

frontend/src/components/LoginForm.tsx

@@ -40,13 +40,13 @@ const LoginForm: React.FC<LoginFormProps> = ({ onClose, onLoginSuccess }) => {
             className="block text-sm font-medium text-zinc-800"
             htmlFor="username"
           >
-            Username
+            Admin Benutzername
           </label>
           <input
             id="username"
             name="username"
             type="text"
-            placeholder="yourname"
+            placeholder="username"
             className="w-full rounded-xl border border-black/25 bg-white/80 px-4 py-2.5 text-sm text-zinc-800 placeholder-zinc-400 shadow-inner outline-none focus:border-black/40 focus:ring-2 focus:ring-black/10"
             required
           />
@@ -55,13 +55,13 @@ const LoginForm: React.FC<LoginFormProps> = ({ onClose, onLoginSuccess }) => {
             className="mt-3 block text-sm font-medium text-zinc-800"
             htmlFor="password"
           >
-            Password
+            Admin Passwort
           </label>
           <input
             id="password"
             name="password"
             type="password"
-            placeholder="••••••••"
+            placeholder="password"
             className="w-full rounded-xl border border-black/25 bg-white/80 px-4 py-2.5 text-sm text-zinc-800 placeholder-zinc-400 shadow-inner outline-none focus:border-black/40 focus:ring-2 focus:ring-black/10"
             required
           />

frontend/src/components/SubHeaderAdmin.tsx

@@ -1,9 +1,14 @@
 import React from "react";
 import { Sheet, WholeWord } from "lucide-react";
+import { useState } from "react";
+import ImportGUI from "./ImportGUI";
 
 // Sub navigation bar for admin views: provides import + clear selection actions
 const SubHeaderAdmin: React.FC = () => {
+  const [showImport, setShowImport] = useState(false);
+
   return (
+    <>
       <header className="sticky top-0 z-30 w-full border-b border-gray-200/70 bg-white/90 backdrop-blur supports-[backdrop-filter]:bg-white/60">
         <div className="mx-auto flex max-w-7xl items-center justify-between gap-4 px-4 py-2.5 md:px-6">
           <div className="flex items-center gap-3">
@@ -20,6 +25,7 @@ const SubHeaderAdmin: React.FC = () => {
           </div>
           <div className="flex items-center gap-2">
             <button
+              onClick={() => setShowImport(true)}
               type="button"
               className="group inline-flex items-center gap-2 rounded-md border border-gray-300 bg-white px-3.5 py-2 text-sm font-medium text-gray-700 shadow-sm transition hover:bg-gray-50 focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-blue-500/60 focus-visible:ring-offset-2 disabled:cursor-not-allowed disabled:opacity-50"
             >
@@ -42,6 +48,8 @@ const SubHeaderAdmin: React.FC = () => {
           </div>
         </div>
       </header>
+      {showImport && <ImportGUI onClose={() => setShowImport(false)} />}
+    </>
   );
 };
 

frontend/src/utils/fileHandler.ts

@@ -0,0 +1,11 @@
+export function downloadHandler(filename: string, content: string) {
+  const blob = new Blob([content], { type: "text/plain" });
+  const url = URL.createObjectURL(blob);
+  const a = document.createElement("a");
+  a.href = url;
+  a.download = filename;
+  document.body.appendChild(a);
+  a.click();
+  document.body.removeChild(a);
+  URL.revokeObjectURL(url);
+}