Update tab styling.

src/Window.zig

@@ -1998,14 +1998,17 @@ fn applySidebarCollapsed(self: *Window, collapsed: bool) void {
     for (self.tabs.items) |tab| self.applyRowCollapsed(tab);
 }
 
-/// One row's share of the collapse: everything but the emoji (or kind icon)
-/// goes. The status dot goes too — the bar down the row's leading edge carries
-/// the state at this width (with a wash behind it for the states that have one),
-/// and it was designed to be the glanceable half of the pair anyway.
+/// One row's share of the collapse: the title and the close button go, the
+/// emoji (or kind icon) and the status dot stay.
+///
+/// The dot used to go as well, back when every state also drew a bar down the
+/// row's leading edge and that bar could carry the state on its own. Only
+/// "finished" draws one now, so at this width the dot is the whole signal for
+/// the other three — and a collapsed sidebar is exactly where you are relying on
+/// a glance rather than on reading anything.
 fn applyRowCollapsed(self: *Window, tab: *Tab) void {
     const shown: c_int = @intFromBool(!self.sidebar_collapsed);
     tab.label.as(gtk.Widget).setVisible(shown);
-    tab.dot.as(gtk.Widget).setVisible(shown);
     tab.close.as(gtk.Widget).setVisible(shown);
 }