feat: Introduce system accounts and verification badges

- Added SystemAccounts enum to manage system account keys and titles.
- Refactored Dialog model to replace isVerified with verified level.
- Implemented effective verification logic for UI display in Dialog.
- Updated DialogRepository to handle user verification levels.
- Enhanced ProtocolManager and SessionManager to log user info with verification.
- Modified AuthCoordinator to support back navigation to unlock screen.
- Improved UnlockView and WelcomeView with new account creation flow.
- Added VerifiedBadge component to visually represent account verification levels.
- Updated ChatListView and SearchView to display verification badges for users.
- Cleaned up debug print statements across various components.

Rosetta/DesignSystem/Components/GlassModifiers.swift

@@ -0,0 +1,41 @@
+import SwiftUI
+
+// MARK: - Glass Navigation Bar Modifier
+
+/// Applies glassmorphism effect to the navigation bar on iOS 26+, falling back to ultra-thin material.
+struct GlassNavBarModifier: ViewModifier {
+    func body(content: Content) -> some View {
+        if #available(iOS 26, *) {
+            content
+        } else {
+            content
+                .toolbarBackground(.ultraThinMaterial, for: .navigationBar)
+        }
+    }
+}
+
+extension View {
+    func applyGlassNavBar() -> some View {
+        modifier(GlassNavBarModifier())
+    }
+}
+
+// MARK: - Glass Search Bar Modifier
+
+/// Applies glassmorphism capsule effect on iOS 26+.
+struct GlassSearchBarModifier: ViewModifier {
+    func body(content: Content) -> some View {
+        if #available(iOS 26, *) {
+            content
+                .glassEffect(.regular, in: .capsule)
+        } else {
+            content
+        }
+    }
+}
+
+extension View {
+    func applyGlassSearchBar() -> some View {
+        modifier(GlassSearchBarModifier())
+    }
+}

Rosetta/DesignSystem/Components/RosettaTabBar.swift

@@ -60,8 +60,7 @@ struct RosettaTabBar: View {
             searchPill
         }
         .padding(.horizontal, 25)
-        .padding(.top, 16)
-        .padding(.bottom, safeAreaBottom > 0 ? safeAreaBottom : 25)
+        .padding(.top, 4)
     }
 }
 

Rosetta/DesignSystem/Components/VerifiedBadge.swift

@@ -0,0 +1,76 @@
+import SwiftUI
+
+// MARK: - VerifiedBadge
+
+/// Displays a verified rosette badge for accounts with server-assigned verification.
+///
+/// Verification levels (from server `verified` field):
+/// - `0` — not verified (badge hidden)
+/// - `1` — public figure, brand, or organization
+/// - `2` — official Rosetta administration account
+/// - `3+` — group administrator
+///
+/// Tapping the badge presents a dialog explaining the verification level.
+struct VerifiedBadge: View {
+    let verified: Int
+    var size: CGFloat = 16
+    var badgeTint: Color?
+
+    @Environment(\.colorScheme) private var colorScheme
+    @State private var showExplanation = false
+
+    var body: some View {
+        if verified > 0 {
+            Image(systemName: "checkmark.seal.fill")
+                .font(.system(size: size))
+                .foregroundStyle(resolvedColor)
+                .onTapGesture { showExplanation = true }
+                .accessibilityLabel("Verified account")
+                .alert("Verified Account", isPresented: $showExplanation) {
+                    Button("OK", role: .cancel) {}
+                } message: {
+                    Text(annotationText)
+                }
+        }
+    }
+
+    // MARK: - Private
+
+    private var resolvedColor: Color {
+        if let badgeTint { return badgeTint }
+        return colorScheme == .dark
+            ? RosettaColors.primaryBlue        // #248AE6
+            : Color(hex: 0xACD2F9)            // soft blue (light theme)
+    }
+
+    private var annotationText: String {
+        switch verified {
+        case 1:
+            return "This is an official account belonging to a public figure, brand, or organization."
+        case 2:
+            return "This is an official account belonging to the administration of Rosetta."
+        default:
+            return "This user is an administrator of this group."
+        }
+    }
+}
+
+// MARK: - Preview
+
+#Preview {
+    VStack(spacing: 16) {
+        HStack {
+            Text("Level 1")
+            VerifiedBadge(verified: 1, size: 16)
+        }
+        HStack {
+            Text("Level 2")
+            VerifiedBadge(verified: 2, size: 20)
+        }
+        HStack {
+            Text("Not verified")
+            VerifiedBadge(verified: 0, size: 16)
+        }
+    }
+    .padding()
+}