fix(voice): add per-lesson failure recovery

pages/feedback/index.wxss

@@ -386,6 +386,10 @@
   font-size: 22rpx;
 }
 
+.voice-record-status-failed {
+  color: #b8322d;
+}
+
 .voice-record-transcript,
 .voice-record-empty {
   margin-top: 12rpx;
@@ -434,6 +438,61 @@
   opacity: 1;
 }
 
+.voice-record-failure-actions {
+  display: flex;
+  width: 100%;
+  min-width: 0;
+  gap: 12rpx;
+  margin-top: 14rpx;
+}
+
+.voice-record-retry-button,
+.voice-record-delete-button {
+  display: flex;
+  flex: 1 1 0;
+  align-items: center;
+  justify-content: center;
+  width: 0;
+  min-width: 0;
+  max-width: none;
+  height: 62rpx;
+  margin: 0;
+  padding: 0;
+  border: 0;
+  border-radius: 10rpx;
+  font-size: 22rpx;
+  font-weight: 600;
+  line-height: 1;
+  transition: transform 100ms ease-out, background-color 100ms ease-out;
+}
+
+.voice-record-retry-button {
+  background: #eaf3ff;
+  color: #007aff;
+}
+
+.voice-record-delete-button {
+  background: #fff2f2;
+  color: #b8322d;
+}
+
+.voice-record-retry-button::after,
+.voice-record-delete-button::after {
+  border: 0;
+}
+
+.voice-record-retry-button:active,
+.voice-record-delete-button:active {
+  transform: scale(0.97);
+}
+
+.voice-record-retry-button[disabled],
+.voice-record-delete-button[disabled] {
+  background: #f1f3f6;
+  color: #aeaeb2;
+  opacity: 1;
+}
+
 .voice-summary-controls {
   padding: 18rpx 0;
   border-top: 1rpx solid #e5e5ea;
@@ -589,6 +648,8 @@
   .voice-button,
   .voice-state-actionable,
   .voice-state-arrow,
+  .voice-record-retry-button,
+  .voice-record-delete-button,
   .feedback-error-copy,
   .feedback-error-retry,
   .feedback-error-close {
@@ -597,6 +658,8 @@
 
   .voice-button:active,
   .voice-state-actionable:active,
+  .voice-record-retry-button:active,
+  .voice-record-delete-button:active,
   .feedback-error-copy:active,
   .feedback-error-retry:active,
   .feedback-error-close:active {