ui: the events list is a slide-over page; the left pane, its divider and the header toggle are gone

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

src/ui/header-bar.ui

@@ -2,8 +2,7 @@
 <!-- SPDX-License-Identifier: MIT -->
 <!-- SPDX-FileCopyrightText: 2026 Martino Ferrari -->
 <!--
-  The header bar: the time-window control's slot, the trigger, pause and events group with the separator that
-  marks where the *view's* controls end, and the three at the far end.
+  The header bar: the time-window control's slot, the trigger and pause group, and the three at the far end.
 
   The bar carries only the controls you reach for *while watching a signal*; everything you set up once lives
   in the overflow menu, which is code — its rows act on the `RowSet` directly and one of them is a toggle
@@ -17,8 +16,8 @@
   from the buffer's limits), and `gtk_header_bar_pack_start()` appends *after* whatever a file has already
   packed, so a control added by code would land to the right of this whole group instead of at its head.
 
-  The events toggle starts hidden: the event history is a *trigger* thing, and asking for it is one click
-  from the mode that produces it.
+  There is no events control here: the event list is the `events` page of the slide-over, reached by the dock's
+  Manage button.
 -->
 <interface>
   <object class="GtkHeaderBar" id="header_bar">
@@ -39,18 +38,6 @@
         <property name="tooltip-text" translatable="yes">pause acquisition</property>
       </object>
     </child>
-    <child type="start">
-      <object class="GtkSeparator">
-        <property name="orientation">vertical</property>
-      </object>
-    </child>
-    <child type="start">
-      <object class="GtkToggleButton" id="events_toggle">
-        <property name="icon-name">udpscope-events-symbolic</property>
-        <property name="tooltip-text" translatable="yes">the event history: the triggered acquisitions kept in the cache, with a picture of each</property>
-        <property name="visible">0</property>
-      </object>
-    </child>
     <child type="end">
       <object class="GtkMenuButton" id="menu_button">
         <property name="icon-name">open-menu-symbolic</property>