Rebrand app to "Wenza" (display name + user-facing copy)

Renames the user-facing app to Wenza without changing identity:
- CFBundleDisplayName → "Wenza" (app) and "Wenza Widgets" (widget extension).
- Calendar/Health permission prompts now reference Wenza.
- In-app copy updated: sidebar title, Auth + Onboarding screens, Settings
  about/help rows, feedback email subject, tutorial text, widget description.

Bundle identifier, App Group, UserDefaults storage keys, team ID, and the
internal Xcode target/project names are intentionally unchanged, so this stays
the same App Store app with no user data loss. App Store listing name must be
changed separately in App Store Connect.

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

KisaniCal/Views/AuthView.swift

@@ -24,7 +24,7 @@ struct AuthView: View {
                             .foregroundColor(AppColors.accent)
                     }
                     VStack(spacing: 6) {
-                        Text("Kisani Cal")
+                        Text("Wenza")
                             .font(AppFonts.sans(32, weight: .bold))
                             .foregroundColor(AppColors.text(cs))
                         Text("Your calendar, your way.")

KisaniCal/Views/OnboardingView.swift

@@ -68,7 +68,7 @@ struct OnboardingView: View {
                                 .foregroundColor(AppColors.accent)
                         }
                         VStack(spacing: 6) {
-                            Text("Welcome to KisaniCal")
+                            Text("Welcome to Wenza")
                                 .font(AppFonts.sans(26, weight: .bold))
                                 .foregroundColor(AppColors.text(cs))
                             Text("Tasks, calendar, and workouts\n— all in one place.")

KisaniCal/Views/SettingsView.swift

@@ -456,7 +456,7 @@ private struct WidgetsSheet: View {
                     }
                     .padding(12).cardStyle()
                 }
-                Text("Long-press your home screen → tap + → search Kisani Cal to add widgets.")
+                Text("Long-press your home screen → tap + → search Wenza to add widgets.")
                     .font(AppFonts.sans(11)).foregroundColor(AppColors.text3(cs))
                     .multilineTextAlignment(.center).padding(.top, 4)
             }
@@ -527,7 +527,7 @@ private struct ImportSheet: View {
                 .padding(.horizontal, 14).padding(.vertical, 12)
             }
             .cardStyle().padding(.horizontal, 20)
-            Text("Enabling integrations will sync events to your Kisani calendar.")
+            Text("Enabling integrations will sync events to your Wenza calendar.")
                 .font(AppFonts.sans(11)).foregroundColor(AppColors.text3(cs))
                 .multilineTextAlignment(.center).padding(.horizontal, 20).padding(.top, 12)
             Spacer()
@@ -957,10 +957,10 @@ private struct HelpSheet: View {
             SheetHeader(title: "Help & Feedback") { dismiss() }
             VStack(spacing: 10) {
                 HelpRow(icon: "envelope", label: "Send Feedback", sub: "Report a bug or suggest a feature") {
-                    if let url = URL(string: "mailto:feedback@kisanicaI.app?subject=Kisani%20Cal%20Feedback") { openURL(url) }
+                    if let url = URL(string: "mailto:feedback@kisanicaI.app?subject=Wenza%20Feedback") { openURL(url) }
                 }
                 HelpRow(icon: "questionmark.circle", label: "FAQ", sub: "Frequently asked questions") {}
-                HelpRow(icon: "book", label: "User Guide", sub: "Learn how to use Kisani Cal") {}
+                HelpRow(icon: "book", label: "User Guide", sub: "Learn how to use Wenza") {}
             }
             .padding(.horizontal, 20)
             Spacer()
@@ -1343,7 +1343,7 @@ private struct AboutSheet: View {
                 Image(systemName: "calendar.badge.clock")
                     .font(.system(size: 48, weight: .light)).foregroundColor(AppColors.accent)
                 VStack(spacing: 4) {
-                    Text("Kisani Cal").font(AppFonts.sans(20, weight: .bold)).foregroundColor(AppColors.text(cs))
+                    Text("Wenza").font(AppFonts.sans(20, weight: .bold)).foregroundColor(AppColors.text(cs))
                     Text("Version 1.0.0").font(AppFonts.mono(11)).foregroundColor(AppColors.text3(cs))
                 }
                 Text("A calm, focused productivity app for tasks, calendar, and fitness.")