fix(progress): drop bogus tenant_id filter on lesson_completions queries

lesson_completions has no tenant_id column (CLAUDE.md). Filtering by it
returned 0 rows, causing course overview and browse page to always show 0%
progress while the in-lesson sidebar (no such filter) correctly showed 100%.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: guillermoscript

app/[locale]/dashboard/student/courses/[courseId]/page.tsx

@@ -88,8 +88,7 @@ export default async function CourseOverviewPage({ params }: PageProps) {
     supabase
       .from('lesson_completions')
       .select('lesson_id')
-      .eq('user_id', userId)
-      .eq('tenant_id', tenantId),
+      .eq('user_id', userId),
     supabase
       .from('exams')
       .select('exam_id')

app/[locale]/dashboard/student/courses/page.tsx

@@ -69,7 +69,7 @@ export default async function MyCoursesPage({ searchParams }: PageProps) {
       supabase.from('exams').select('exam_id, title, sequence, passing_score, allow_retake, course_id')
         .in('course_id', courseIds).eq('tenant_id', tenantId),
       supabase.from('lesson_completions').select('lesson_id, completed_at')
-        .eq('user_id', userId).eq('tenant_id', tenantId),
+        .eq('user_id', userId),
       supabase.from('exam_submissions').select('submission_id, exam_id, submission_date, score')
         .eq('student_id', userId).eq('tenant_id', tenantId),
     ])