Fix grocery sync deletions not persisting and Reminders race condition

Stop cascading syncs by adding an isReconciling flag so that
reconcileFromServer no longer triggers scheduleSync via addItem/deleteItem.
Make Reminders write-only by removing the diff/sync logic from the
onDataChanged callback. Fetch fresh server state in RecipeView reconcile
instead of using stale local cache. Track pending removal recipe IDs via
DataStore so performInitialSync can push deletions for recipes whose
grocery keys have already been removed from groceryDict.

Fix a race condition in RemindersGroceryStore where EKEventStoreChanged
notifications triggered load() before saveMappings() finished writing to
disk, causing the correct in-memory state to be overwritten with stale
data. Add ignoreNextExternalChange flag to skip self-triggered reloads.

Restyle the add/remove all grocery button to match the Plan recipe button
style using Label, subheadline font, and rounded rectangle background.

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

Nextcloud Cookbook iOS Client/Data/RemindersGroceryStore.swift

@@ -35,6 +35,11 @@ class RemindersGroceryStore {
     private let mappingPath = "reminder_mappings.data"
     private var mappingStore = ReminderMappingStore()
 
+    /// When true, the next `EKEventStoreChanged` notification is skipped because
+    /// it was triggered by our own save. Prevents a race where `load()` reads stale
+    /// mapping data from disk before `saveMappings()` finishes writing.
+    private var ignoreNextExternalChange = false
+
     init() {
         NotificationCenter.default.addObserver(
             forName: .EKEventStoreChanged,
@@ -43,6 +48,10 @@ class RemindersGroceryStore {
         ) { [weak self] _ in
             Task { @MainActor in
                 guard let self else { return }
+                if self.ignoreNextExternalChange {
+                    self.ignoreNextExternalChange = false
+                    return
+                }
                 await self.load()
                 self.onDataChanged?()
             }
@@ -104,11 +113,13 @@ class RemindersGroceryStore {
         reminder.title = itemName
         reminder.calendar = calendar
         do {
+            ignoreNextExternalChange = true
             try eventStore.save(reminder, commit: true)
             let name = recipeName ?? "-"
             addMapping(reminderIdentifier: reminder.calendarItemIdentifier, recipeId: recipeId, recipeName: name, itemName: itemName)
             appendToCache(itemName: itemName, recipeId: recipeId, recipeName: name)
         } catch {
+            ignoreNextExternalChange = false
             Logger.view.error("Failed to save reminder: \(error.localizedDescription)")
         }
     }
@@ -132,8 +143,10 @@ class RemindersGroceryStore {
             }
         }
         do {
+            ignoreNextExternalChange = true
             try eventStore.commit()
         } catch {
+            ignoreNextExternalChange = false
             Logger.view.error("Failed to commit reminders: \(error.localizedDescription)")
         }
         saveMappings()
@@ -153,8 +166,10 @@ class RemindersGroceryStore {
             let reminders = await fetchReminders(matching: predicate, in: store)
             for reminder in reminders where reminder.calendarItemIdentifier == identifier {
                 do {
+                    self.ignoreNextExternalChange = true
                     try self.eventStore.remove(reminder, commit: true)
                 } catch {
+                    self.ignoreNextExternalChange = false
                     Logger.view.error("Failed to remove reminder: \(error.localizedDescription)")
                 }
                 break
@@ -181,8 +196,10 @@ class RemindersGroceryStore {
                 }
             }
             do {
+                self.ignoreNextExternalChange = true
                 try self.eventStore.commit()
             } catch {
+                self.ignoreNextExternalChange = false
                 Logger.view.error("Failed to commit reminder removal: \(error.localizedDescription)")
             }
             self.mappingStore.recipes.removeValue(forKey: recipeId)
@@ -209,8 +226,10 @@ class RemindersGroceryStore {
                 }
             }
             do {
+                self.ignoreNextExternalChange = true
                 try self.eventStore.commit()
             } catch {
+                self.ignoreNextExternalChange = false
                 Logger.view.error("Failed to commit reminder removal: \(error.localizedDescription)")
             }
             self.mappingStore.recipes = [:]