Document recent platform features

[mintlify]

Updated documentation to reflect recent staging branch features including office hours improvements, test insights dashboard, grading tools, and discussion board enhancements. Added comprehensive coverage of new UX features like the help drawer, notifications system, karma rewards, image uploads, leaderboards, and security monitoring.

Files Changed

• students/office-hours.mdx - Added help drawer access, notifications system, and conflict validation
• staff/office-hours/intro.mdx - Added queue configuration, student access methods, and notification details
• staff/assignments/autograding.mdx - Added test insights dashboard and regrade workflow documentation
• staff/assignments/testing.mdx - Added autograder rerun with version selection
• staff/assignments/grading-assignments.mdx - Added grading status dashboard
• students/discussion-board.mdx - Added image upload support and karma system
• staff/discussion.mdx - Added karma system and image upload documentation
• students/assignments/create-submission.mdx - Added leaderboard feature
• staff/assignments/intro.mdx - Added extension date picker, leaderboard, and security dashboard

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