Organize submissions: tags, filters & bulk actions

The Submissions tab lists every submission — draft and submitted — in a table. Search it, and filter by status, tags, assignees, or date. Apply tags to individual submissions or in bulk to group them (for example, "Round 2"). Then act in bulk: assign reviewers, tag, or export many submissions at once. The Evaluations column on each row shows the average score and opens the full evaluation history.