fix: fix "previous versions" button failing after transpose

this change stops the button from refreshing (or being replaced) and losing its event listener for opening the modal.

app/views/chord_sheets/_main.html.slim

@@ -21,7 +21,7 @@ turbo-frame[id=dom_id(chord_sheet) data-controller="clipboard chord-diagram moda
               span.icon
                 i.fas.fa-arrow-circle-down
 
-        .level-right.align-items-space-between
+        .level-right.align-items-space-between#level-right[data-turbo-permanent]
           .level-item.mt-2 data-chord-diagram-target="wrapper"
             = render("chord_diagram_icon")
             .hidden#diagram-select data-chord-diagram-target="selectBox"

spec/cypress/e2e/chord_sheets.cy.js

@@ -120,6 +120,13 @@ describe("Undoing changes", () => {
     cy.get("#versions").click()
 
     cy.contains("My amazing song")
+
+    cy.get(".modal-close").click()
+    cy.get("#transpose-up").click() // even after transposing
+
+    cy.get("#versions").click()
+
+    cy.contains("My amazing song")
   })
 
   it("allows the user to restore a previous version", () => {