feat: add recent session switchers

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

@@ -11,6 +11,7 @@ import UniformTypeIdentifiers
 struct ClawdisChatComposer: View {
     @Bindable var viewModel: ClawdisChatViewModel
     let style: ClawdisChatView.Style
+    let showsSessionSwitcher: Bool
 
     #if !os(macOS)
     @State private var pickerItems: [PhotosPickerItem] = []
@@ -23,6 +24,9 @@ struct ClawdisChatComposer: View {
         VStack(alignment: .leading, spacing: 4) {
             if self.showsToolbar {
                 HStack(spacing: 6) {
+                    if self.showsSessionSwitcher {
+                        self.sessionPicker
+                    }
                     self.thinkingPicker
                     Spacer()
                     self.refreshButton
@@ -91,6 +95,26 @@ struct ClawdisChatComposer: View {
         .frame(maxWidth: 140, alignment: .leading)
     }
 
+    private var sessionPicker: some View {
+        Picker(
+            "Session",
+            selection: Binding(
+                get: { self.viewModel.sessionKey },
+                set: { next in self.viewModel.switchSession(to: next) }))
+        {
+            ForEach(self.viewModel.sessionChoices, id: \.key) { session in
+                Text(session.key)
+                    .font(.system(.caption, design: .monospaced))
+                    .tag(session.key)
+            }
+        }
+        .labelsHidden()
+        .pickerStyle(.menu)
+        .controlSize(.small)
+        .frame(maxWidth: 160, alignment: .leading)
+        .help("Session")
+    }
+
     @ViewBuilder
     private var attachmentPicker: some View {
         #if os(macOS)

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

@@ -58,7 +58,10 @@ public struct ClawdisChatView: View {
             VStack(spacing: Layout.stackSpacing) {
                 self.messageList
                     .padding(.horizontal, Layout.outerPaddingHorizontal)
-                ClawdisChatComposer(viewModel: self.viewModel, style: self.style)
+                ClawdisChatComposer(
+                    viewModel: self.viewModel,
+                    style: self.style,
+                    showsSessionSwitcher: self.showsSessionSwitcher)
                     .padding(.horizontal, Layout.composerPaddingHorizontal)
             }
             .padding(.vertical, Layout.outerPaddingVertical)

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

@@ -99,6 +99,42 @@ public final class ClawdisChatViewModel {
         Task { await self.performSwitchSession(to: sessionKey) }
     }
 
+    public var sessionChoices: [ClawdisChatSessionEntry] {
+        let now = Date().timeIntervalSince1970 * 1000
+        let cutoff = now - (24 * 60 * 60 * 1000)
+        let sorted = self.sessions.sorted { ($0.updatedAt ?? 0) > ($1.updatedAt ?? 0) }
+        var seen = Set<String>()
+        var recent: [ClawdisChatSessionEntry] = []
+        for entry in sorted {
+            guard !seen.contains(entry.key) else { continue }
+            seen.insert(entry.key)
+            guard (entry.updatedAt ?? 0) >= cutoff else { continue }
+            recent.append(entry)
+        }
+
+        let mainKey = "main"
+        var result: [ClawdisChatSessionEntry] = []
+        var included = Set<String>()
+        if let main = sorted.first(where: { $0.key == mainKey }) {
+            result.append(main)
+            included.insert(mainKey)
+        } else if self.sessionKey == mainKey {
+            result.append(self.placeholderSession(key: mainKey))
+            included.insert(mainKey)
+        }
+
+        for entry in recent where !included.contains(entry.key) {
+            result.append(entry)
+            included.insert(entry.key)
+        }
+
+        if !included.contains(self.sessionKey) {
+            result.append(self.placeholderSession(key: self.sessionKey))
+        }
+
+        return result
+    }
+
     public func addAttachments(urls: [URL]) {
         Task { await self.loadAttachments(urls: urls) }
     }
@@ -301,6 +337,23 @@ public final class ClawdisChatViewModel {
         await self.bootstrap()
     }
 
+    private func placeholderSession(key: String) -> ClawdisChatSessionEntry {
+        ClawdisChatSessionEntry(
+            key: key,
+            kind: nil,
+            updatedAt: nil,
+            sessionId: nil,
+            systemSent: nil,
+            abortedLastRun: nil,
+            thinkingLevel: nil,
+            verboseLevel: nil,
+            inputTokens: nil,
+            outputTokens: nil,
+            totalTokens: nil,
+            model: nil,
+            contextTokens: nil)
+    }
+
     private func handleTransportEvent(_ evt: ClawdisChatTransportEvent) {
         switch evt {
         case let .health(ok):