Add aria-label

src/lib/components/impacts_view/test_cases_view/test_case_selected/graph/TestCaseGraph.svelte

@@ -1061,6 +1061,7 @@
                             initialPlacement="top"
                           >
                             <button
+                              aria-labelledby="hide-show-tooltip-{variable.name}"
                               class="group h-full pl-0.5 pr-1"
                               onclick={() => {
                                 variableCustomizations[
@@ -1095,7 +1096,7 @@
                             </button>
                             {#snippet tooltip()}
                               <div
-                                id="hide-show-tooltip"
+                                id="hide-show-tooltip-{variable.name}"
                                 class="overflow-hidden rounded-lg bg-black px-2 py-1 text-sm text-white"
                                 title={isSelected ? "Cacher" : "Montrer"}
                               >