Effective config: empty multi-value UX, clickable changes count

- Multi-value: show editable badge next to (none); clicking activates edit and opens add row
- List editor: when empty and add allowed, do not show (none) row; auto-focus new-item input on open and when clicking add item
- Toolbar: make 'X change(s)' clickable to open save dialog (keyboard accessible)

src/DnsmasqWebUI/Components/EffectiveConfig/Composition/EffectiveConfigSection.razor.css

@@ -38,6 +38,14 @@
     margin-left: auto;
 }
 
+::deep .ec-toolbar-changes-link {
+    cursor: pointer;
+}
+
+::deep .ec-toolbar-changes-link:hover {
+    text-decoration: underline;
+}
+
 .ec-sections {
     display: flex;
     flex-direction: column;