diff --git a/.github/workflows/package-build-check.yml b/.github/workflows/package-build-check.yml
new file mode 100644
index 00000000..c027f9f4
--- /dev/null
+++ b/.github/workflows/package-build-check.yml
@@ -0,0 +1,53 @@
+name: Package build check
+
+on:
+  pull_request:
+    paths:
+      - 'apps/dashboard/**'
+      - 'apps/api/**'
+      - 'packages/**'
+      - 'pnpm-lock.yaml'
+      - 'package.json'
+      - 'turbo.json'
+      - '.nvmrc'
+      - '.github/workflows/package-build-check.yml'
+  push:
+    branches:
+      - main
+    paths:
+      - 'apps/dashboard/**'
+      - 'apps/api/**'
+      - 'packages/**'
+      - 'pnpm-lock.yaml'
+      - 'package.json'
+      - 'turbo.json'
+      - '.nvmrc'
+      - '.github/workflows/package-build-check.yml'
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Setup pnpm
+        uses: pnpm/action-setup@v4
+
+      - name: Setup Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: '20'
+          cache: 'pnpm'
+
+      - name: Install dependencies
+        run: pnpm install --frozen-lockfile
+
+      - name: Prepare dashboard env
+        run: cp apps/dashboard/.env.example apps/dashboard/.env
+
+      - name: Build dashboard
+        run: pnpm --filter @cio/dashboard^... build && pnpm --filter @cio/dashboard build
+
+      - name: Build API
+        run: pnpm --filter @cio/api^... build && pnpm --filter @cio/api build
diff --git a/AGENTS.md b/AGENTS.md
index 67252006..f47f2431 100644
--- a/AGENTS.md
+++ b/AGENTS.md
@@ -20,6 +20,29 @@ When a task requires factual information (API specifications, context window siz
 - Commit messages must follow the Conventional Commits 1.0.0 spec: https://www.conventionalcommits.org/en/v1.0.0/
 - Never include agent-provider attribution in commits or commit trailers. Do not add `Co-authored-by` lines for Cursor, Claude, Codex, or any other tool.
 
+## Verification before commit/PR
+
+Before committing or opening/updating a PR, run the build checks that match the areas you changed. Use Node 20 (the repo's `.nvmrc` version):
+
+```bash
+export PATH="$HOME/.nvm/versions/node/v20.19.3/bin:$PATH"
+```
+
+- **Dashboard changes** (`apps/dashboard/**`, or shared packages consumed by the dashboard):
+
+  ```bash
+  test -f apps/dashboard/.env || cp apps/dashboard/.env.example apps/dashboard/.env
+  pnpm --filter @cio/dashboard^... build && pnpm --filter @cio/dashboard build
+  ```
+
+- **API changes** (`apps/api/**`, or shared packages consumed by the API):
+
+  ```bash
+  pnpm --filter @cio/api^... build && pnpm --filter @cio/api build
+  ```
+
+Also run `pnpm format:check` (see Translation, Formatting, and Git Workflow above). Do not commit if any verification step fails.
+
 ## Naming Convention
 
 - Use kebab-case for files (e.g. `user-profile.svelte`, `org.svelte.ts`).
diff --git a/apps/dashboard/src/lib/features/course/components/lesson/content-navigation-actions.svelte b/apps/dashboard/src/lib/features/course/components/lesson/content-navigation-actions.svelte
index 0b6c8300..9ec965d8 100644
--- a/apps/dashboard/src/lib/features/course/components/lesson/content-navigation-actions.svelte
+++ b/apps/dashboard/src/lib/features/course/components/lesson/content-navigation-actions.svelte
@@ -7,8 +7,10 @@
   import { Button } from '@cio/ui/base/button';
   import * as Tooltip from '@cio/ui/base/tooltip';
   import { PercentRingProgress } from '@cio/ui/custom/percent-ring-progress';
+  import { get } from 'svelte/store';
   import { isCourseLearnerView } from '$lib/utils/store/app';
   import { getStudentContentLockReason } from '$features/ai-assistant/utils/content-ask-ai-bar';
+  import { getStudentContentLockTitleKey } from '$features/course/utils/content-lock-utils';
   import { t } from '$lib/utils/functions/translations';
   import { courseApi, lessonApi } from '$features/course/api';
   import { getOrderedNavigableContent, getContentRoute } from '$features/course/utils/content';
@@ -50,16 +52,21 @@
     };
   });
 
+  function getNavigableLockReason(target: CourseContentItem | null) {
+    if (!target) return null;
+
+    const targetType = target.type === ContentType.Lesson ? ContentType.Lesson : ContentType.Exercise;
+    return getStudentContentLockReason(courseApi.course, target.id, targetType);
+  }
+
   function goToContent(target: CourseContentItem | null) {
     if (!target) return;
 
-    if ($isCourseLearnerView) {
-      const targetType = target.type === ContentType.Lesson ? ContentType.Lesson : ContentType.Exercise;
-      const lockReason = getStudentContentLockReason(courseApi.course, target.id, targetType);
+    const lockReason = getNavigableLockReason(target);
 
-      if (lockReason) {
-        return;
-      }
+    if (get(isCourseLearnerView) && lockReason) {
+      snackbar.error(getStudentContentLockTitleKey(lockReason));
+      return;
     }
 
     const courseIdResolved = courseApi.course?.id;
@@ -71,6 +78,20 @@
 
   const isPrevDisabled = $derived(!prevNextContent.prev);
   const isNextDisabled = $derived(!prevNextContent.next);
+  const prevNavLockReason = $derived($isCourseLearnerView ? getNavigableLockReason(prevNextContent.prev) : null);
+  const nextNavLockReason = $derived($isCourseLearnerView ? getNavigableLockReason(prevNextContent.next) : null);
+  const isPrevNavBlocked = $derived(Boolean(prevNavLockReason));
+  const isNextNavBlocked = $derived(Boolean(nextNavLockReason));
+  const prevNavTooltip = $derived(
+    prevNavLockReason
+      ? $t(getStudentContentLockTitleKey(prevNavLockReason))
+      : $t('course.navItem.lessons.prev_shortcut')
+  );
+  const nextNavTooltip = $derived(
+    nextNavLockReason
+      ? $t(getStudentContentLockTitleKey(nextNavLockReason))
+      : $t('course.navItem.lessons.next_shortcut')
+  );
   const isLessonComplete = $derived.by(() => {
     if (!lessonId) return false;
     const lesson = lessonItems.find((l) => l.id === lessonId);
@@ -145,7 +166,7 @@
       updateCourseContentCompletion(currentLessonId, isComplete);
 
       const allComplete =
-        $isOrgStudent &&
+        get(isCourseLearnerView) &&
         isComplete &&
         navigableContentItems.length > 0 &&
         navigableContentItems.every((item) => item.isComplete);
@@ -231,14 +252,14 @@
             size="icon-sm"
             variant="outline"
             onclick={() => goToContent(prevNextContent.prev)}
-            disabled={isPrevDisabled}
+            disabled={isPrevDisabled || isPrevNavBlocked}
             aria-label={$t('course.navItem.lessons.prev')}
           >
             <ChevronLeftIcon size={14} />
           </Button>
         </Tooltip.Trigger>
         <Tooltip.Content side="bottom" sideOffset={4}>
-          {$t('course.navItem.lessons.prev_shortcut')}
+          {prevNavTooltip}
         </Tooltip.Content>
       </Tooltip.Root>
 
@@ -248,14 +269,14 @@
             size="icon-sm"
             variant="outline"
             onclick={() => goToContent(prevNextContent.next)}
-            disabled={isNextDisabled}
+            disabled={isNextDisabled || isNextNavBlocked}
             aria-label={$t('course.navItem.lessons.next')}
           >
             <ChevronRightIcon size={14} />
           </Button>
         </Tooltip.Trigger>
         <Tooltip.Content side="bottom" sideOffset={4}>
-          {$t('course.navItem.lessons.next_shortcut')}
+          {nextNavTooltip}
         </Tooltip.Content>
       </Tooltip.Root>
     </div>