feat(tutorial): enhance tutorial flow and add tests for help button functionality

frontend/src/tutorial/HelpButton.vue

@@ -14,7 +14,7 @@
 <script setup lang="ts">
 import { computed } from 'vue'
 import { useRoute } from 'vue-router'
-import { activeStep, maybeShow, clearChainProgress, modalTutorialStepId, helpButtonHidden } from './controller'
+import { activeStep, maybeShow, clearChainProgress, modalTutorialStepId, helpButtonHidden, sessionSkipped } from './controller'
 
 // Map route names to the tutorial step that should re-fire when the user taps `?`.
 // Keep this list lean — only routes that have a tutorial step actually wired.
@@ -65,7 +65,9 @@ function onClick() {
   if (!id) return
   // Clear any active step so the manual re-fire wins.
   activeStep.value = null
-  // Temporarily clear local "seen" for the whole chain so every step replays.
+  // A previous Cancel/Skip would otherwise permanently block manual help.
+  sessionSkipped.value = false
+  // Temporarily clear local "seen" state for the whole chain so every step replays.
   // The server state is left alone; on dismiss `markStepSeen` simply no-ops.
   clearChainProgress(id)
   maybeShow(id, null, true)