help: the search block's (i) on its header, a 12 px mark, and a real search page

src/ui/trigger-panel.ui

@@ -214,8 +214,23 @@
     </child>
     <child>
       <object class="GtkExpander" id="search_exp">
-        <property name="label" translatable="yes">Search the buffer</property>
         <property name="tooltip-text" translatable="yes">find every place in the retained buffer where the condition above holds, and step through them</property>
+        <!-- The header is a box, not a plain label, so the contextual help's "(i)" has a row to join
+             as its last child and sits beside the text while the block is collapsed. The block's own
+             *child* is not in the widget-parent chain until the expander is expanded (see
+             docs/claude/invariants-gtk-and-chrome.md), so a hint hung there would be off screen. -->
+        <child type="label">
+          <object class="GtkBox" id="search_head">
+            <property name="orientation">horizontal</property>
+            <property name="spacing">6</property>
+            <child>
+              <object class="GtkLabel">
+                <property name="label" translatable="yes">Search the buffer</property>
+                <property name="halign">start</property>
+              </object>
+            </child>
+          </object>
+        </child>
         <property name="child">
 
       <object class="GtkBox" id="search_sbox">