T24a round 1 fix

- overlays::Dialog caps its card at the window, a title bar's height clear
  at each end, and scrolls its body while heading and actions stay; the
  fullscreen body scrolls too; test a_tall_dialog_keeps_its_actions_in_the_window
- ToolCallCard's tool name gives way with an Ellipsis, so time and chevron
  stay in a narrow column; the gallery shows one at 280px
- the Agent script shuts the card it opened, so each theme's shot opens it
- AGENTS: dialogs fit the window

src/agent/tools.rs

@@ -123,10 +123,10 @@ impl RenderOnce for ToolCallCard {
                 .child(step_mark((self.id.clone(), "mark").into(), self.status, cx))
                 .child(
                     div()
-                        .flex_none()
+                        .min_w_0()
                         .font_family(theme.mono_family.clone())
                         .text_color(colors.fg)
-                        .child(self.name),
+                        .child(Ellipsis::new(self.name)),
                 )
                 .child(
                     div()