Fix session rename not updating across views

After rename:
- Update selectedSession so detail header refreshes immediately
- Update sessionPreviews so previewFor() returns the new title
- Dashboard now observes HermesFileWatcher and reloads on DB changes
- Chat session menu reloads via file watcher (persists across nav)

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

scarf/scarf/Features/Chat/Views/ChatView.swift

@@ -2,6 +2,7 @@ import SwiftUI
 
 struct ChatView: View {
     @Environment(ChatViewModel.self) private var viewModel
+    @Environment(HermesFileWatcher.self) private var fileWatcher
 
     var body: some View {
         VStack(spacing: 0) {
@@ -11,6 +12,9 @@ struct ChatView: View {
         }
         .navigationTitle("Chat")
         .task { await viewModel.loadRecentSessions() }
+        .onChange(of: fileWatcher.lastChangeDate) {
+            Task { await viewModel.loadRecentSessions() }
+        }
     }
 
     private var toolbar: some View {
@@ -36,6 +40,10 @@ struct ChatView: View {
 
             Spacer()
 
+            if viewModel.hasActiveProcess {
+                voiceControls
+            }
+
             if !viewModel.hermesBinaryExists {
                 Label("Hermes binary not found", systemImage: "exclamationmark.triangle")
                     .font(.caption)
@@ -80,6 +88,41 @@ struct ChatView: View {
         .padding(.vertical, 6)
     }
 
+    private var voiceControls: some View {
+        HStack(spacing: 8) {
+            Button {
+                viewModel.toggleVoice()
+            } label: {
+                HStack(spacing: 4) {
+                    Image(systemName: viewModel.voiceEnabled ? "mic.fill" : "mic.slash")
+                        .foregroundStyle(viewModel.voiceEnabled ? .green : .secondary)
+                    Text(viewModel.voiceEnabled ? "Voice On" : "Voice Off")
+                        .font(.caption)
+                        .foregroundStyle(viewModel.voiceEnabled ? .primary : .secondary)
+                }
+            }
+            .buttonStyle(.plain)
+            .help("Toggle voice mode (/voice)")
+
+            if viewModel.voiceEnabled {
+                Button {
+                    viewModel.pushToTalk()
+                } label: {
+                    HStack(spacing: 4) {
+                        Image(systemName: viewModel.isRecording ? "waveform.circle.fill" : "waveform.circle")
+                            .foregroundStyle(viewModel.isRecording ? .red : .accentColor)
+                            .symbolEffect(.pulse, isActive: viewModel.isRecording)
+                        Text(viewModel.isRecording ? "Recording..." : "Push to Talk")
+                            .font(.caption)
+                    }
+                }
+                .buttonStyle(.plain)
+                .help("Push to talk (Ctrl+B)")
+                .keyboardShortcut("b", modifiers: .control)
+            }
+        }
+    }
+
     @ViewBuilder
     private var terminalArea: some View {
         if let terminal = viewModel.terminalView {

scarf/scarf/Features/Dashboard/Views/DashboardView.swift

@@ -3,6 +3,7 @@ import SwiftUI
 struct DashboardView: View {
     @State private var viewModel = DashboardViewModel()
     @Environment(AppCoordinator.self) private var coordinator
+    @Environment(HermesFileWatcher.self) private var fileWatcher
 
     var body: some View {
         ScrollView {
@@ -16,6 +17,9 @@ struct DashboardView: View {
         }
         .navigationTitle("Dashboard")
         .task { await viewModel.load() }
+        .onChange(of: fileWatcher.lastChangeDate) {
+            Task { await viewModel.load() }
+        }
     }
 
     private var statusSection: some View {

scarf/scarf/Features/Sessions/ViewModels/SessionsViewModel.swift

@@ -83,7 +83,7 @@ final class SessionsViewModel {
         let result = runHermes(["sessions", "rename", sessionId, title])
         if result.exitCode == 0 {
             if let idx = sessions.firstIndex(where: { $0.id == sessionId }) {
-                sessions[idx] = HermesSession(
+                let updated = HermesSession(
                     id: sessions[idx].id, source: sessions[idx].source,
                     userId: sessions[idx].userId, model: sessions[idx].model,
                     title: title, parentSessionId: sessions[idx].parentSessionId,
@@ -94,7 +94,12 @@ final class SessionsViewModel {
                     cacheWriteTokens: sessions[idx].cacheWriteTokens,
                     estimatedCostUSD: sessions[idx].estimatedCostUSD
                 )
+                sessions[idx] = updated
+                if selectedSession?.id == sessionId {
+                    selectedSession = updated
+                }
             }
+            sessionPreviews[sessionId] = title
         }
         showRenameSheet = false
         renameSessionId = nil