feat: add light theme, redesign onboarding, full-window panels

clients/macos/vellum-assistant/App/AppDelegate.swift

@@ -116,8 +116,10 @@ public final class AppDelegate: NSObject, NSApplicationDelegate {
     private var cachedSkills: [SkillInfo] = []
     private var refreshSkillsTask: Task<Void, Never>?
 
+    @AppStorage("themePreference") private var themePreference: String = "system"
+
     public func applicationDidFinishLaunching(_ notification: Notification) {
-        NSApp.appearance = NSAppearance(named: .darkAqua)
+        applyThemePreference()
         registerBundledFonts()
 
         #if DEBUG
@@ -147,6 +149,38 @@ public final class AppDelegate: NSObject, NSApplicationDelegate {
         showMainWindow()
     }
 
+    /// Applies the user's theme preference to the app appearance.
+    /// Called on launch and whenever the setting changes.
+    func applyThemePreference() {
+        let pref = UserDefaults.standard.string(forKey: "themePreference") ?? "system"
+        let appearance: NSAppearance?
+        switch pref {
+        case "light":
+            appearance = NSAppearance(named: .aqua)
+        case "dark":
+            appearance = NSAppearance(named: .darkAqua)
+        default:
+            appearance = nil // follow system
+        }
+        NSApp.appearance = appearance
+        // Propagate to all existing windows so the change takes effect immediately
+        for window in NSApp.windows {
+            window.appearance = appearance
+            window.invalidateShadow()
+            window.contentView?.needsDisplay = true
+            window.displayIfNeeded()
+        }
+        // Force SwiftUI to re-evaluate adaptive colors by toggling the appearance
+        DispatchQueue.main.async {
+            for window in NSApp.windows {
+                window.contentView?.effectiveAppearance.performAsCurrentDrawingAppearance {
+                    window.contentView?.needsLayout = true
+                    window.contentView?.needsDisplay = true
+                }
+            }
+        }
+    }
+
     private func setupDaemonClient() {
         // Show macOS notification when a reminder fires
         daemonClient.onReminderFired = { msg in

clients/macos/vellum-assistant/Features/Chat/ChatView.swift

@@ -158,13 +158,16 @@ struct ChatView: View {
         )
     }
 
+    @Environment(\.colorScheme) private var colorScheme
+
     @ViewBuilder
     private var chatBackground: some View {
         if let url = ResourceBundle.bundle.url(forResource: "background", withExtension: "png"),
            let nsImage = NSImage(contentsOf: url) {
             Image(nsImage: nsImage)
                 .resizable()
                 .scaledToFit()
+                .opacity(colorScheme == .light ? 0 : 1.0)
                 .allowsHitTesting(false)
         }
     }
@@ -311,7 +314,7 @@ struct ChatView: View {
                     }
 
                     if isThinking {
-                        ThinkingIndicator()
+                        ThinkingIndicator(label: messages.count <= 1 ? "Waking up..." : "Thinking")
                             .id("thinking-indicator")
                             .transition(.opacity.combined(with: .move(edge: .bottom)))
                     }
@@ -839,12 +842,19 @@ private struct ChatBubble: View {
 // MARK: - Thinking Indicator
 
 private struct ThinkingIndicator: View {
+    var label: String = "Thinking"
     @State private var phase: Int = 0
     @State private var timer: Timer?
 
     var body: some View {
         HStack(spacing: VSpacing.xs) {
-            Text("Thinking")
+            Image("OwlIcon")
+                .resizable()
+                .scaledToFit()
+                .frame(width: 12, height: 12)
+                .foregroundColor(VColor.textSecondary)
+
+            Text(label)
                 .font(VFont.caption)
                 .foregroundColor(VColor.textSecondary)
 

clients/macos/vellum-assistant/Features/MainWindow/MainWindow.swift

@@ -86,8 +86,8 @@ final class MainWindow {
         let hostingController = NSHostingController(rootView: MainWindowView(threadManager: threadManager, zoomManager: zoomManager, traceStore: traceStore, daemonClient: daemonClient, surfaceManager: surfaceManager, ambientAgent: ambientAgent, settingsStore: services.settingsStore, windowState: windowState, onMicrophoneToggle: onMicrophoneToggle ?? {}))
 
         let screenFrame = NSScreen.main?.visibleFrame ?? NSScreen.screens.first?.visibleFrame ?? NSRect(x: 0, y: 0, width: 1440, height: 900)
-        let windowWidth = min(screenFrame.width * 0.8, 1200)
-        let windowHeight = min(screenFrame.height * 0.85, 900)
+        let windowWidth: CGFloat = 780
+        let windowHeight: CGFloat = 700
         let windowRect = NSRect(
             x: screenFrame.midX - windowWidth / 2,
             y: screenFrame.midY - windowHeight / 2,
@@ -107,7 +107,7 @@ final class MainWindow {
         window.titlebarAppearsTransparent = true
         window.backgroundColor = NSColor(VColor.background)
         window.isReleasedWhenClosed = false
-        window.contentMinSize = NSSize(width: 800, height: 600)
+        window.contentMinSize = NSSize(width: 500, height: 400)
         window.setFrame(windowRect, display: false)
         window.setFrameAutosaveName("MainWindow")