Budget: per-person expense tracking with member chips

- New budget_item_members junction table (migration 27)
- Assign trip members to budget items via avatar chips in Persons column
- Per-person split auto-calculated from assigned member count
- Per-person summary integrated into total budget card
- Member chips rendered via portal dropdown (no overflow clipping)
- Mobile: larger touch-friendly chips (30px) under item name
- Desktop: compact chips (20px) in Persons column
- Custom NOMAD-style tooltips on chips
- WebSocket live sync for all member operations
- Fix invite button text color in dark mode
- Widen budget layout to 1800px max-width
- Shorten "Per Person/Day" column header

client/src/i18n/translations/de.js

@@ -630,7 +630,7 @@ const de = {
   'budget.table.days': 'Tage',
   'budget.table.perPerson': 'Pro Person',
   'budget.table.perDay': 'Pro Tag',
-  'budget.table.perPersonDay': 'Pro Person/Tag',
+  'budget.table.perPersonDay': 'P. p / Tag',
   'budget.table.note': 'Notiz',
   'budget.newEntry': 'Neuer Eintrag',
   'budget.defaultEntry': 'Neuer Eintrag',
@@ -641,6 +641,10 @@ const de = {
   'budget.editTooltip': 'Klicken zum Bearbeiten',
   'budget.confirm.deleteCategory': 'Möchtest du die Kategorie "{name}" mit {count} Einträgen wirklich löschen?',
   'budget.deleteCategory': 'Kategorie löschen',
+  'budget.perPerson': 'Pro Person',
+  'budget.paid': 'Bezahlt',
+  'budget.open': 'Offen',
+  'budget.noMembers': 'Keine Teilnehmer zugewiesen',
 
   // Files
   'files.title': 'Dateien',

client/src/i18n/translations/en.js

@@ -630,7 +630,7 @@ const en = {
   'budget.table.days': 'Days',
   'budget.table.perPerson': 'Per Person',
   'budget.table.perDay': 'Per Day',
-  'budget.table.perPersonDay': 'Per Person/Day',
+  'budget.table.perPersonDay': 'P. p / Day',
   'budget.table.note': 'Note',
   'budget.newEntry': 'New Entry',
   'budget.defaultEntry': 'New Entry',
@@ -641,6 +641,10 @@ const en = {
   'budget.editTooltip': 'Click to edit',
   'budget.confirm.deleteCategory': 'Are you sure you want to delete the category "{name}" with {count} entries?',
   'budget.deleteCategory': 'Delete Category',
+  'budget.perPerson': 'Per Person',
+  'budget.paid': 'Paid',
+  'budget.open': 'Open',
+  'budget.noMembers': 'No members assigned',
 
   // Files
   'files.title': 'Files',