iOS drawer: flat reorderable calendars, long-press menu, left-swipe close, header actions

Testing feedback:
- calendars are now one flat, drag-reorderable list (no per-source grouping);
  order is device-local (CalendarStore.calendarOrder, mirrors the web cal_order).
  Reordering is done via a 'Sort' toggle (native edit mode with drag handles).
- banish + reminder-mute moved from row swipe actions to a long-press context
  menu, which frees the horizontal swipe: swiping the drawer left closes it.
- the hamburger moved to the LEFT (drawer opens left); new device-local setting
  'Hide menu button' (open via edge-swipe only), not synced.
- the settings entry moved from the footer into the header as an icon, next to a
  restored manual-sync icon and the close button; the footer button is gone.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

Calendarr iOS/Views/SettingsView.swift

@@ -3,6 +3,7 @@ import SwiftUI
 struct SettingsView: View {
     let api: CalendarrAPI
     @AppStorage("liquidGlass")       private var liquidGlass = false
+    @AppStorage("hideMenuButton")    private var hideMenuButton = false
     @AppStorage("cacheMonths")       private var cacheMonths = 3
     @AppStorage("appLanguage")       private var appLang = "system"
     @AppStorage("monthDividerColor") private var dividerHex = "#7090C0"
@@ -416,6 +417,8 @@ struct SettingsView: View {
                     .foregroundStyle(.secondary)
                     .accessibilityLabel(L10n.t("settings.surface.auto", appLang))
             }
+            Toggle(L10n.t("settings.hide_menu_button", appLang), isOn: $hideMenuButton)
+                .tint(Color.accentColor)
         } header: {
             Text(L10n.t("settings.device", appLang))
         } footer: {