From 9f89cb17a0e6a823094b9a1ad54a6998600aef36 Mon Sep 17 00:00:00 2001
From: Agent Zero <agent@media-on.de>
Date: Fri, 21 Aug 2026 13:38:20 +0200
Subject: [PATCH] fix(UI-Overhaul-Phase5): Kalender Visibility-Toggle fix
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5.1: Toolbar already has PluginToolbar with navigation, view mode, actions — no changes needed
5.2: Calendar visibility toggle fix:
  - calendarStore.setCalendars now initializes visibleCalendarIds with all calendar IDs
  - CalendarTree.tsx visibility check simplified to visibleCalendarIds.has(cal.id)
  - No more empty-set-means-all-visible confusion

tsc clean
---
 frontend/src/components/calendar/CalendarTree.tsx | 4 +---
 frontend/src/store/calendarStore.ts               | 8 +++++++-
 2 files changed, 8 insertions(+), 4 deletions(-)

diff --git a/frontend/src/components/calendar/CalendarTree.tsx b/frontend/src/components/calendar/CalendarTree.tsx
index 4a9576a..7a5195c 100644
--- a/frontend/src/components/calendar/CalendarTree.tsx
+++ b/frontend/src/components/calendar/CalendarTree.tsx
@@ -128,9 +128,7 @@ function TypeSection({
               <CalendarRow
                 calendar={cal}
                 selected={activeCalendarId === cal.id}
-                visible={
-                  visibleCalendarIds.size === 0 || visibleCalendarIds.has(cal.id)
-                }
+                visible={visibleCalendarIds.has(cal.id)}
                 onSelect={() => onSelect(cal.id)}
                 onToggleVisibility={() => onToggleVisibility(cal.id)}
               />
diff --git a/frontend/src/store/calendarStore.ts b/frontend/src/store/calendarStore.ts
index 7a6d027..fe573d5 100644
--- a/frontend/src/store/calendarStore.ts
+++ b/frontend/src/store/calendarStore.ts
@@ -139,7 +139,13 @@ export const useCalendarStore = create<CalendarState>((set) => ({
     }),
 
   setActiveCalendarId: (id) => set({ activeCalendarId: id }),
-  setCalendars: (calendars) => set({ calendars }),
+  setCalendars: (calendars) => set((s) => {
+    // Initialize visibleCalendarIds with all calendar IDs if empty
+    const visibleCalendarIds = s.visibleCalendarIds.size === 0
+      ? new Set(calendars.map((c) => c.id))
+      : s.visibleCalendarIds;
+    return { calendars, visibleCalendarIds };
+  }),
   setSelectedEntry: (entry) => set({ selectedEntry: entry }),
   toggleCalendarVisibility: (id) =>
     set((s) => {