Sprint 2: attempt cards, file import button, question layout, radio/check, sticky save

- Replace attempts table with attempts-card-list cards
- Custom import: sr-only file input + btn-styled label
- question-editor-block: stack header on mobile, row from 520px
- option marks: radio for single correct, checkbox for multiple
- Fixed bottom actions on max-width 640px with draft status; hide in-flow panel
- Update СПРИНТЫ_МОБИЛЬНЫЙ_ДИЗАЙН.md and DOC/ШАГИ/ШАГ_2026-04-27_003.md

Made-with: Cursor

frontend/src/styles/cabinet-theme.css

@@ -900,3 +900,161 @@ code,
     box-sizing: border-box;
   }
 }
+
+/* --- Спринт 2: редактор вопроса, прогоны, импорт, фикс. футер --- */
+
+.question-editor-block__header {
+  display: flex;
+  flex-direction: column;
+  align-items: stretch;
+  gap: 0.5rem;
+  margin-bottom: 0.5rem;
+}
+
+.question-editor-block__title {
+  margin-bottom: 0;
+  font-size: 0.95rem;
+}
+
+.question-editor-block__ai-btn {
+  width: 100%;
+  text-align: center;
+  box-sizing: border-box;
+  align-self: stretch;
+}
+
+@media (min-width: 520px) {
+  .question-editor-block__header {
+    flex-direction: row;
+    flex-wrap: wrap;
+    align-items: center;
+    justify-content: space-between;
+  }
+
+  .question-editor-block__ai-btn {
+    width: auto;
+    align-self: center;
+  }
+}
+
+/* Спринт 2.4: radio = один верный, checkbox = несколько (нативная метафора) */
+.question-option-row__mark {
+  width: 1.15rem;
+  height: 1.15rem;
+  flex-shrink: 0;
+  margin-top: 0.1rem;
+  cursor: pointer;
+  accent-color: var(--primary);
+}
+
+/* Список прогонов: карточки */
+.attempts-card-list {
+  list-style: none;
+  margin: 0;
+  padding: 0;
+  display: flex;
+  flex-direction: column;
+  gap: 0.5rem;
+}
+
+.attempts-card-list__item {
+  margin: 0;
+}
+
+.attempts-card-list__row {
+  display: flex;
+  flex-wrap: wrap;
+  align-items: flex-start;
+  justify-content: space-between;
+  gap: 0.75rem;
+}
+
+.attempts-card-list__main {
+  flex: 1 1 12rem;
+  min-width: 0;
+}
+
+.attempts-card-list__action {
+  flex: 0 0 auto;
+}
+
+@media (max-width: 520px) {
+  .attempts-card-list__row {
+    flex-direction: column;
+  }
+
+  .attempts-card-list__action {
+    width: 100%;
+    text-align: center;
+  }
+}
+
+/* Импорт: скрытый input + кнопка-стиль */
+.import-file-input {
+  position: absolute;
+  width: 1px;
+  height: 1px;
+  padding: 0;
+  margin: -1px;
+  overflow: hidden;
+  clip: rect(0, 0, 0, 0);
+  white-space: nowrap;
+  border: 0;
+}
+
+.import-file-row {
+  position: relative;
+  display: flex;
+  flex-wrap: wrap;
+  align-items: center;
+  gap: 0.5rem;
+}
+
+.import-file-label {
+  margin: 0;
+  cursor: pointer;
+  width: auto;
+  display: inline-block;
+  box-sizing: border-box;
+}
+
+/* Мобилка: закреплённый футер с «Сохранить» (дубль панели скрыт) */
+.test-detail-fixed-actions {
+  display: none;
+}
+
+@media (max-width: 640px) {
+  .test-detail-page--with-fixed-actions {
+    padding-bottom: calc(6.5rem + env(safe-area-inset-bottom, 0px));
+  }
+
+  .test-detail-page--with-fixed-actions .editor-actions-flow {
+    display: none;
+  }
+
+  .test-detail-fixed-actions {
+    display: block;
+    position: fixed;
+    left: 0;
+    right: 0;
+    bottom: 0;
+    z-index: 30;
+    padding: 0.65rem 1.25rem calc(0.65rem + env(safe-area-inset-bottom, 0px));
+    background: color-mix(in srgb, var(--surface) 96%, #fff);
+    border-top: 1px solid color-mix(in srgb, var(--outline-variant) 45%, transparent);
+    box-shadow: 0 -4px 24px rgba(0, 0, 0, 0.08);
+  }
+
+  .test-detail-fixed-actions__inner {
+    max-width: var(--max-content);
+    margin: 0 auto;
+  }
+
+  .test-detail-fixed-actions__status {
+    margin: 0 0 0.45rem;
+    font-size: 0.8rem;
+    line-height: 1.3;
+    max-height: 3.2rem;
+    overflow: auto;
+  }
+}