Add paper/print alternatives for off-screen learning

- Spelling: "Blank test" print button per word list (numbered lines, no words shown) for dictated paper tests
- Spelling: "Record Paper Test" form in admin to log a paper test score to the gradebook
- Gradebook: "Record Paper Score" form to log a paper quiz/assignment score for any course item
- Flashcards: "Print" button per deck generates a cut-and-fold card sheet (fronts page + backs page)
- Crossword: print now includes a second page with a filled answer key
- Lessons + Assignments: 🖨 Print button in student view generates a clean printable page
- Word lists: new "CSV file" import tab — upload a .csv with word, sentence, definition columns

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

public/index.html

@@ -160,6 +160,7 @@
     <div class="item-card">
       <p class="item-kicker" id="lesson-kicker"></p>
       <h1 id="lesson-title"></h1>
+      <button id="lesson-print-btn" class="secondary small" style="float:right;margin-bottom:.5rem">🖨 Print</button>
       <div id="lesson-body" class="lesson-body"></div>
       <button id="lesson-done-btn" class="check-btn">Done reading ✓</button>
       <div id="lesson-next-actions" class="next-actions" hidden></div>
@@ -172,6 +173,7 @@
     <div class="item-card">
       <p class="item-kicker" id="assignment-kicker"></p>
       <h1 id="assignment-title"></h1>
+      <button id="assignment-print-btn" class="secondary small" style="float:right;margin-bottom:.5rem">🖨 Print</button>
       <p id="assignment-points" class="points-label"></p>
       <div id="assignment-body" class="lesson-body"></div>
       <div id="assignment-evidence-section" hidden>