feat(delivery): replace deliveryEditorSlice with automat and add PDF/text attachment handling

- replace Redux deliveryEditorSlice with deliveryEditorAutomat using automat
- add Attachment and AttachmentList components in Kopfdaten
- extract PDF text via pdftotext-wasm and render PDF thumbnails with pdfjs-dist
- add TextEditorDialog to view and edit extracted text files (preformatted monospace, no wrap)
- configure Vite server.fs.allow for pdftotext.wasm

vite.config.js

@@ -1,7 +1,7 @@
 import fs from 'node:fs';
 import path from 'node:path';
 import { fileURLToPath } from 'node:url';
-import { defineConfig } from 'vite';
+import { defineConfig, searchForWorkspaceRoot } from 'vite';
 import react from '@vitejs/plugin-react';
 import { VitePWA } from 'vite-plugin-pwa';
 
@@ -90,6 +90,12 @@ const sharedServer = {
   port: useHttps ? 4308 : 4209,
   https: httpsOptions(),
   allowedHosts: true,
+  fs: {
+    allow: [
+      searchForWorkspaceRoot(process.cwd()),
+      path.resolve(__dirname, '..'),
+    ],
+  },
   proxy: {
     '/api': {
       target: 'http://localhost:4208',