refactor: normalize group session keys

apps/shared/ClawdisKit/Sources/ClawdisChatUI/ChatComposer.swift

@@ -103,7 +103,7 @@ struct ClawdisChatComposer: View {
                 set: { next in self.viewModel.switchSession(to: next) }))
         {
             ForEach(self.viewModel.sessionChoices, id: \.key) { session in
-                Text(session.key)
+                Text(session.displayName ?? session.key)
                     .font(.system(.caption, design: .monospaced))
                     .tag(session.key)
             }

apps/shared/ClawdisKit/Sources/ClawdisChatUI/ChatSessions.swift

@@ -10,6 +10,11 @@ public struct ClawdisChatSessionEntry: Codable, Identifiable, Sendable, Hashable
 
     public let key: String
     public let kind: String?
+    public let displayName: String?
+    public let surface: String?
+    public let subject: String?
+    public let room: String?
+    public let space: String?
     public let updatedAt: Double?
     public let sessionId: String?
 

apps/shared/ClawdisKit/Sources/ClawdisChatUI/ChatSheets.swift

@@ -14,7 +14,7 @@ struct ChatSessionsSheet: View {
                     self.dismiss()
                 } label: {
                     VStack(alignment: .leading, spacing: 4) {
-                        Text(session.key)
+                        Text(session.displayName ?? session.key)
                             .font(.system(.body, design: .monospaced))
                             .lineLimit(1)
                         if let updatedAt = session.updatedAt, updatedAt > 0 {

apps/shared/ClawdisKit/Sources/ClawdisChatUI/ChatViewModel.swift

@@ -341,6 +341,11 @@ public final class ClawdisChatViewModel {
         ClawdisChatSessionEntry(
             key: key,
             kind: nil,
+            displayName: nil,
+            surface: nil,
+            subject: nil,
+            room: nil,
+            space: nil,
             updatedAt: nil,
             sessionId: nil,
             systemSent: nil,

apps/shared/ClawdisKit/Tests/ClawdisKitTests/ChatViewModelTests.swift

@@ -282,6 +282,11 @@ private extension TestChatTransportState {
                 ClawdisChatSessionEntry(
                     key: "recent-1",
                     kind: nil,
+                    displayName: nil,
+                    surface: nil,
+                    subject: nil,
+                    room: nil,
+                    space: nil,
                     updatedAt: recent,
                     sessionId: nil,
                     systemSent: nil,
@@ -296,6 +301,11 @@ private extension TestChatTransportState {
                 ClawdisChatSessionEntry(
                     key: "main",
                     kind: nil,
+                    displayName: nil,
+                    surface: nil,
+                    subject: nil,
+                    room: nil,
+                    space: nil,
                     updatedAt: stale,
                     sessionId: nil,
                     systemSent: nil,
@@ -310,6 +320,11 @@ private extension TestChatTransportState {
                 ClawdisChatSessionEntry(
                     key: "recent-2",
                     kind: nil,
+                    displayName: nil,
+                    surface: nil,
+                    subject: nil,
+                    room: nil,
+                    space: nil,
                     updatedAt: recentOlder,
                     sessionId: nil,
                     systemSent: nil,
@@ -324,6 +339,11 @@ private extension TestChatTransportState {
                 ClawdisChatSessionEntry(
                     key: "old-1",
                     kind: nil,
+                    displayName: nil,
+                    surface: nil,
+                    subject: nil,
+                    room: nil,
+                    space: nil,
                     updatedAt: stale,
                     sessionId: nil,
                     systemSent: nil,
@@ -365,6 +385,11 @@ private extension TestChatTransportState {
                 ClawdisChatSessionEntry(
                     key: "main",
                     kind: nil,
+                    displayName: nil,
+                    surface: nil,
+                    subject: nil,
+                    room: nil,
+                    space: nil,
                     updatedAt: recent,
                     sessionId: nil,
                     systemSent: nil,