Don't show Continue/Back if the concept has been completed

Author: VasylMarchuk

app/components/concept/index.hbs

@@ -23,16 +23,18 @@
           />
         {{else if (eq block.type "click_to_continue")}}
           {{#if (eq blockGroup.index this.currentBlockGroupIndex)}}
-            <Concept::ContinueOrStepBack
-              {{! @glint-expect-error: buttonTextForDisplay not typecast yet }}
-              @continueButtonText={{block.buttonTextForDisplay}}
-              @onContinueButtonClick={{this.handleContinueButtonClick}}
-              @onStepBackButtonClick={{this.handleStepBackButtonClick}}
-              @shouldHighlightKeyboardShortcuts={{true}}
-              @shouldShowContinueButton={{true}}
-              @shouldShowStepBackButton={{not-eq this.currentBlockGroupIndex 0}}
-              class="mb-6"
-            />
+            {{#unless this.hasFinished}}
+              <Concept::ContinueOrStepBack
+                {{! @glint-expect-error: buttonTextForDisplay not typecast yet }}
+                @continueButtonText={{block.buttonTextForDisplay}}
+                @onContinueButtonClick={{this.handleContinueButtonClick}}
+                @onStepBackButtonClick={{this.handleStepBackButtonClick}}
+                @shouldHighlightKeyboardShortcuts={{true}}
+                @shouldShowContinueButton={{true}}
+                @shouldShowStepBackButton={{not-eq this.currentBlockGroupIndex 0}}
+                class="mb-6"
+              />
+            {{/unless}}
           {{/if}}
         {{else}}
           <div class="mb-6">