fix pages and add distribution system

app/Views/administrator/teacher_class_assignment.php

@@ -17,25 +17,6 @@
                     <a href="<?= site_url('configuration/configuration_view') ?>" class="alert-link">Add/Edit Configuration</a> (key: <code>school_year</code>).
                 </div>
             <?php endif; ?>
-            <div class="d-flex justify-content-center align-items-center gap-2 mb-3">
-                <label for="tcaYearSelect" class="col-form-label">School year</label>
-                <form method="get" action="<?= site_url('administrator/teacher_class_assignment') ?>" class="d-flex align-items-center gap-2">
-                    <select id="tcaYearSelect" name="schoolYear" class="form-select form-select-sm" style="min-width: 180px;">
-                        <?php
-                          $years = isset($schoolYears) && is_array($schoolYears) ? $schoolYears : [];
-                          if (empty($years) && !empty($schoolYear)) $years = [$schoolYear];
-                          foreach ($years as $y): $val = is_array($y) && isset($y['school_year']) ? $y['school_year'] : (string)$y; ?>
-                            <option value="<?= esc($val) ?>" <?= ((string)($schoolYear ?? '') === (string)$val) ? 'selected' : '' ?>>
-                              <?= esc($val) ?>
-                            </option>
-                        <?php endforeach; ?>
-                    </select>
-                    <button type="submit" class="btn btn-secondary btn-sm">Apply</button>
-                </form>
-                <?php if (isset($isCurrentYear) && !$isCurrentYear): ?>
-                  <span class="badge bg-secondary">Read-only (Past Year)</span>
-                <?php endif; ?>
-            </div>
 
             <?= view('partials/flash_messages') ?>
             <div id="assignmentMessages"></div>