dayplan toolbar polish + weather archive fallback

- weather: add archive API branch in getWeather for past dates
  (previously returned no_forecast, making the day-strip widget show "—")
- dayplan: add expand/collapse-all toggle between ICS and Undo with
  animated icon swap (ChevronsUpDown <-> ChevronsDownUp)
- dayplan: drop the trip title + date range block from the sidebar header
  (already shown in the page header), toolbar now right-aligned

client/src/i18n/translations/de.ts

@@ -908,6 +908,8 @@ const de: Record<string, string | { name: string; category: string }[]> = {
   'dayplan.cannotDropOnTimed': 'Orte können nicht zwischen zeitgebundene Einträge geschoben werden',
   'dayplan.cannotBreakChronology': 'Die zeitliche Reihenfolge von Uhrzeiten und Buchungen darf nicht verletzt werden',
   'dayplan.addNote': 'Notiz hinzufügen',
+  'dayplan.expandAll': 'Alle Tage ausklappen',
+  'dayplan.collapseAll': 'Alle Tage einklappen',
   'dayplan.editNote': 'Notiz bearbeiten',
   'dayplan.noteAdd': 'Notiz hinzufügen',
   'dayplan.noteEdit': 'Notiz bearbeiten',

client/src/i18n/translations/en.ts

@@ -965,6 +965,8 @@ const en: Record<string, string | { name: string; category: string }[]> = {
   'dayplan.cannotDropOnTimed': 'Items cannot be placed between time-bound entries',
   'dayplan.cannotBreakChronology': 'This would break the chronological order of timed items and bookings',
   'dayplan.addNote': 'Add Note',
+  'dayplan.expandAll': 'Expand all days',
+  'dayplan.collapseAll': 'Collapse all days',
   'dayplan.editNote': 'Edit Note',
   'dayplan.noteAdd': 'Add Note',
   'dayplan.noteEdit': 'Edit Note',