Adds a "Correct" button to each test in the Spelling Test History table. Clicking it opens a modal showing each word, what the student typed, and a checkbox to mark it correct or incorrect. Saving PATCHes the server, which updates test_answers, recalculates the test score, and keeps any linked course submission in sync. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>