Fix chat input height for programmatic text insertion and code review improvements

- Replace manual dynamicHeight binding with UIViewRepresentable.sizeThatFits so
  SwiftUI uses the correct proposed width (not frame.width which can be zero during
  sheet dismissal), fixing overflow when inserting bash output into chat
- Call invalidateIntrinsicContentSize in updateUIView to trigger a second layout
  pass after programmatic text changes
- Make maxHeight/minHeight static constants
- Guard against nil chatViewModel in startChatCallback to avoid silent text drop
- Add previews for Insert/StartChat paths in BashQuickView and QuickActionsView

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: mcintyre94

Wisp/Views/QuickActions/BashQuickView.swift

@@ -133,7 +133,7 @@ struct BashQuickView: View {
     }
 }
 
-#Preview {
+#Preview("No callback") {
     BashQuickView(
         viewModel: BashQuickViewModel(
             spriteName: "my-sprite",
@@ -142,3 +142,25 @@ struct BashQuickView: View {
     )
     .environment(SpritesAPIClient())
 }
+
+#Preview("Insert into chat") {
+    BashQuickView(
+        viewModel: BashQuickViewModel(
+            spriteName: "my-sprite",
+            workingDirectory: "/home/sprite/project"
+        ),
+        onInsert: { _ in }
+    )
+    .environment(SpritesAPIClient())
+}
+
+#Preview("Start Chat") {
+    BashQuickView(
+        viewModel: BashQuickViewModel(
+            spriteName: "my-sprite",
+            workingDirectory: "/home/sprite/project"
+        ),
+        onStartChat: { _ in }
+    )
+    .environment(SpritesAPIClient())
+}

Wisp/Views/QuickActions/QuickActionsView.swift

@@ -65,7 +65,7 @@ struct QuickActionsView: View {
     }
 }
 
-#Preview {
+#Preview("No callback") {
     QuickActionsView(
         viewModel: QuickActionsViewModel(
             spriteName: "my-sprite",
@@ -75,3 +75,27 @@ struct QuickActionsView: View {
     )
     .environment(SpritesAPIClient())
 }
+
+#Preview("Insert into chat") {
+    QuickActionsView(
+        viewModel: QuickActionsViewModel(
+            spriteName: "my-sprite",
+            sessionId: nil,
+            workingDirectory: "/home/sprite/project"
+        ),
+        insertCallback: { _ in }
+    )
+    .environment(SpritesAPIClient())
+}
+
+#Preview("Start Chat") {
+    QuickActionsView(
+        viewModel: QuickActionsViewModel(
+            spriteName: "my-sprite",
+            sessionId: nil,
+            workingDirectory: "/home/sprite/project"
+        ),
+        startChatCallback: { _ in }
+    )
+    .environment(SpritesAPIClient())
+}

Wisp/Views/SpriteDetail/Chat/ChatInputBar.swift

@@ -20,7 +20,6 @@ struct ChatInputBar: View {
     var isFocused: FocusState<Bool>.Binding
 
     @State private var showStopConfirmation = false
-    @State private var textInputHeight: CGFloat = 36
 
     private var isEmpty: Bool {
         text.trimmingCharacters(in: .whitespacesAndNewlines).isEmpty && attachedFiles.isEmpty
@@ -75,10 +74,8 @@ struct ChatInputBar: View {
                     isFocused: isFocused,
                     isDisabled: hasQueuedMessage,
                     placeholder: "Message...",
-                    onPasteNonText: onPasteFromClipboard,
-                    dynamicHeight: $textInputHeight
+                    onPasteNonText: onPasteFromClipboard
                 )
-                .frame(height: max(textInputHeight, 36))
                 .padding(.horizontal, 16)
                 .padding(.vertical, 8)
                 .glassEffect(in: .rect(cornerRadius: 20))
@@ -119,9 +116,6 @@ struct ChatInputBar: View {
                 .buttonStyle(.glass)
             }
         }
-        .onChange(of: text) { _, newValue in
-            if newValue.isEmpty { textInputHeight = 36 }
-        }
         .animation(.easeInOut(duration: 0.2), value: attachedFiles.count)
         .animation(.easeInOut(duration: 0.2), value: lastUploadedFileName)
         .padding(.horizontal)

Wisp/Views/SpriteDetail/Chat/PasteInterceptingTextInput.swift

@@ -84,7 +84,9 @@ struct PasteInterceptingTextInput: UIViewRepresentable {
     var isDisabled: Bool
     var placeholder: String
     var onPasteNonText: (() -> Void)?
-    @Binding var dynamicHeight: CGFloat
+
+    private static let maxHeight: CGFloat = 120
+    private static let minHeight: CGFloat = 36
 
     func makeUIView(context: Context) -> PasteTextView {
         let textView = PasteTextView()
@@ -100,10 +102,22 @@ struct PasteInterceptingTextInput: UIViewRepresentable {
         return textView
     }
 
+    func sizeThatFits(_ proposal: ProposedViewSize, uiView: PasteTextView, context: Context) -> CGSize? {
+        let width = proposal.width ?? uiView.frame.width
+        guard width > 0 else { return nil }
+        let fits = uiView.sizeThatFits(CGSize(width: width, height: .infinity))
+        let height = max(min(fits.height, Self.maxHeight), Self.minHeight)
+        uiView.isScrollEnabled = fits.height > Self.maxHeight
+        return CGSize(width: width, height: height)
+    }
+
     func updateUIView(_ textView: PasteTextView, context: Context) {
+        context.coordinator.parent = self
         if textView.text != text {
             textView.text = text
             textView.updatePlaceholderVisibility()
+            // Invalidate so SwiftUI calls sizeThatFits again with the updated text
+            textView.invalidateIntrinsicContentSize()
         }
         textView.isUserInteractionEnabled = !isDisabled
         textView.placeholder = placeholder
@@ -128,7 +142,6 @@ struct PasteInterceptingTextInput: UIViewRepresentable {
     final class Coordinator: NSObject, UITextViewDelegate {
         var parent: PasteInterceptingTextInput
         var isEditing = false
-        private let maxHeight: CGFloat = 120
 
         init(_ parent: PasteInterceptingTextInput) {
             self.parent = parent
@@ -137,13 +150,8 @@ struct PasteInterceptingTextInput: UIViewRepresentable {
         func textViewDidChange(_ textView: UITextView) {
             parent.text = textView.text
             (textView as? PasteTextView)?.updatePlaceholderVisibility()
-
-            let fitsSize = textView.sizeThatFits(CGSize(width: textView.frame.width, height: .infinity))
-            let newHeight = min(fitsSize.height, maxHeight)
-            if newHeight != parent.dynamicHeight {
-                parent.dynamicHeight = newHeight
-            }
-            textView.isScrollEnabled = fitsSize.height > maxHeight
+            // Signal SwiftUI to re-query sizeThatFits with the new content
+            textView.invalidateIntrinsicContentSize()
         }
 
         func textViewDidBeginEditing(_ textView: UITextView) {
@@ -160,16 +168,13 @@ struct PasteInterceptingTextInput: UIViewRepresentable {
 
 #Preview {
     @Previewable @State var text = ""
-    @Previewable @State var height: CGFloat = 36
     @Previewable @FocusState var focused: Bool
     PasteInterceptingTextInput(
         text: $text,
         isFocused: $focused,
         isDisabled: false,
-        placeholder: "Message...",
-        dynamicHeight: $height
+        placeholder: "Message..."
     )
-    .frame(height: max(height, 36))
     .padding(.horizontal, 16)
     .padding(.vertical, 8)
     .glassEffect(in: .rect(cornerRadius: 20))

Wisp/Views/SpriteDetail/SpriteDetailView.swift

@@ -237,7 +237,8 @@ struct SpriteDetailView: View {
             QuickActionsView(
                 viewModel: vm,
                 startChatCallback: { text in
-                    chatViewModel?.inputText += (chatViewModel?.inputText.isEmpty == true ? "" : "\n") + text
+                    guard let chatViewModel else { return }
+                    chatViewModel.inputText += (chatViewModel.inputText.isEmpty ? "" : "\n") + text
                     selectedTab = .chat
                     spriteQuickActionsViewModel = nil
                 }