Center task modals

mac/Sources/Byre/Chat.swift

@@ -688,12 +688,11 @@ private struct DiscardButton: View {
     var small = false
     @Environment(Store.self) private var store
     @Environment(Overlays.self) private var overlays
-    @ViewState private var frame: CGRect = .zero
 
     var body: some View {
         let button = Button("Discard") {
             Task {
-                await confirmDiscard(task, store, overlays, anchor: frame)
+                await confirmDiscard(task, store, overlays)
             }
         }
         Group {
@@ -705,11 +704,6 @@ private struct DiscardButton: View {
         }
         .disabled(busy)
         .help("The agent writes the task summary, then byre deletes the worktree and branch without merging")
-        .onGeometryChange(for: CGRect.self) { g in
-            g.frame(in: .named("window"))
-        } action: { f in
-            frame = f
-        }
     }
 }