feat(gradebook): add gradebook page with column picker, CSV export, and statistics bridge#8400
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… links
Introduce the course gradebook: a frozen-column table of students × assessments
with a column picker, CSV export, and per-grade links into submissions.
Gradebook table
- Page with TanStack-backed table: pinned checkbox + Name columns, sticky
header and Max Marks rows, frozen-column border seams that survive sticky
scroll compositing.
- Column picker (assessments grouped by tab/category) and CSV export of the
selected columns; empty-state hint when no data columns are chosen.
- External ID column, shown when any student has one.
- Grade cells link to the student's submission; a dismissible GradeLinkHint
banner explains the affordance (persisted per-user via useDismissibleOnce).
- "Search students" global search.
Shared table builder
- getColumnCanGlobalFilter is gated on column visibility ("search what you
see"): hiding a column via the picker removes it from search, and the
nullable-first-row type sniff is bypassed. Affects all TanStack tables.
Backend
- Gradebook controller, ability and course component; index JSON serializes
students, assessments, submissions (with submissionId) and gamification.
- Submission grade query also selects the submission id for grade links.
- Remove the redundant ScoreAssessmentSummary download from Statistics.
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Summary
Adds a new Gradebook page (
/courses/:id/gradebook) giving staff a consolidated view of student grades across all published assessments. The page renders a TanStack-backed table with per-student rows and per-assessment grade columns, supports a tree-structured column picker (student info, gamification, and grades branches), persists column visibility to localStorage per user per course, and exports the visible columns as CSV. Gamification columns (Level, XP) are hidden from the picker when the course has gamification disabled. The Statistics → Assessments tab gains a subtitle explaining it is only for course-level statistics to bridge the two views. The existing "Download Score Summary" button on that tab is removed in full (frontend component, operations, API method, Rails controller action, route, background job, service, and locale keys) since the gradebook supersedes it.Regression prevention
Tests added:
GradebookColumnTree.test.tsx- covers branch rendering, gamification gating, checkbox disabled state, parent toggle propagation, and mixed visibility indeterminate stateGradebookIndex.test.tsx- covers loading state, table render, empty student state, column picker toggle, and error toast on fetch failureGradebookTable.test.tsx- covers grade cell rendering, unsubmitted placeholder, column visibility, CSV export header/row content, and localStorage persistence across remountsgradebook_controller_spec.rb(authorization, index JSON shape),assessment_spec.rbandsubmission_spec.rb(new query methods),aggregate_controller_spec.rb(gradebookEnabled flag)Manual testing: All scenarios confirmed - gradebook page loads with students and grades, column picker toggles persist and reflect in CSV, gamification columns absent when disabled, empty state renders cleanly, score summary button gone.
Backward compat: Score summary download removed for all users on upgrade; no migration needed. All other Statistics features unchanged.