Participants, context menus, budget rename, file types, UI polish

- Assignment participants: toggle who joins each activity
  - Chips with hover-to-remove (strikethrough effect)
  - Add button with dropdown for available members
  - Avatars in day plan sidebar
  - Side-by-side with reservation in place inspector
- Right-click context menus for places, notes in day plan + places list
- Budget categories can now be renamed (pencil icon inline edit)
- Admin: configurable allowed file types (stored in app_settings)
- File manager shows allowed types dynamically
- Hotel picker: select place + save button (no auto-close)
- Edit pencil opens full hotel popup with all options
- Place inspector: opening hours + files side by side on desktop
- Address clamped to 2 lines, coordinates hidden on mobile
- Category shows icon only on mobile
- Rating hidden on mobile in place inspector
- Time validation: "10" becomes "10:00"
- Climate weather: full hourly data from archive API
- CustomSelect: grouped headers support (isHeader)
- Various responsive fixes

client/src/i18n/translations/de.js

@@ -281,6 +281,12 @@ const de = {
   'admin.oidcIssuerHint': 'Die OpenID Connect Issuer URL des Anbieters. z.B. https://accounts.google.com',
   'admin.oidcSaved': 'OIDC-Konfiguration gespeichert',
 
+  // File Types
+  'admin.fileTypes': 'Erlaubte Dateitypen',
+  'admin.fileTypesHint': 'Konfiguriere welche Dateitypen hochgeladen werden dürfen.',
+  'admin.fileTypesFormat': 'Kommagetrennte Endungen (z.B. jpg,png,pdf,doc). Verwende * um alle Typen zu erlauben.',
+  'admin.fileTypesSaved': 'Dateityp-Einstellungen gespeichert',
+
   // Addons
   'admin.tabs.addons': 'Addons',
   'admin.addons.title': 'Addons',
@@ -549,6 +555,7 @@ const de = {
   'inspector.website': 'Webseite öffnen',
   'inspector.addRes': 'Reservierung',
   'inspector.editRes': 'Reservierung bearbeiten',
+  'inspector.participants': 'Teilnehmer',
 
   // Reservations
   'reservations.title': 'Buchungen',
@@ -641,6 +648,7 @@ const de = {
   'files.uploadError': 'Fehler beim Hochladen',
   'files.dropzone': 'Dateien hier ablegen',
   'files.dropzoneHint': 'oder klicken zum Auswählen',
+  'files.allowedTypes': 'Bilder, PDF, DOC, DOCX, XLS, XLSX, TXT, CSV · Max 50 MB',
   'files.uploading': 'Wird hochgeladen...',
   'files.filterAll': 'Alle',
   'files.filterPdf': 'PDFs',

client/src/i18n/translations/en.js

@@ -281,6 +281,12 @@ const en = {
   'admin.oidcIssuerHint': 'The OpenID Connect Issuer URL of the provider. e.g. https://accounts.google.com',
   'admin.oidcSaved': 'OIDC configuration saved',
 
+  // File Types
+  'admin.fileTypes': 'Allowed File Types',
+  'admin.fileTypesHint': 'Configure which file types users can upload.',
+  'admin.fileTypesFormat': 'Comma-separated extensions (e.g. jpg,png,pdf,doc). Use * to allow all types.',
+  'admin.fileTypesSaved': 'File type settings saved',
+
   // Addons
   'admin.tabs.addons': 'Addons',
   'admin.addons.title': 'Addons',
@@ -549,6 +555,7 @@ const en = {
   'inspector.website': 'Open Website',
   'inspector.addRes': 'Reservation',
   'inspector.editRes': 'Edit Reservation',
+  'inspector.participants': 'Participants',
 
   // Reservations
   'reservations.title': 'Bookings',
@@ -641,6 +648,7 @@ const en = {
   'files.uploadError': 'Upload failed',
   'files.dropzone': 'Drop files here',
   'files.dropzoneHint': 'or click to browse',
+  'files.allowedTypes': 'Images, PDF, DOC, DOCX, XLS, XLSX, TXT, CSV · Max 50 MB',
   'files.uploading': 'Uploading...',
   'files.filterAll': 'All',
   'files.filterPdf': 'PDFs',