feat(ext/popup): trash view — list trashed items with restore/purge

Shows trashed items sorted newest-first with restore buttons.
Empty trash button purges all items + orphan blobs. Header shows
count and days until oldest auto-purges.

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

extension/src/popup/styles.css

@@ -998,3 +998,65 @@ textarea {
   padding: 0 6px;
   cursor: pointer;
 }
+
+/* --- Trash view --- */
+
+.trash-header {
+  display: flex;
+  align-items: center;
+  gap: 12px;
+  margin-bottom: 8px;
+}
+
+.trash-row {
+  display: flex;
+  align-items: center;
+  gap: 8px;
+  padding: 8px;
+  border-radius: 4px;
+  background: #161b22;
+  margin-bottom: 6px;
+}
+
+.trash-row__icon {
+  font-size: 16px;
+  flex-shrink: 0;
+}
+
+.trash-row__info {
+  flex: 1;
+  min-width: 0;
+}
+
+.trash-row__title {
+  display: block;
+  font-size: 13px;
+  color: #c9d1d9;
+  white-space: nowrap;
+  overflow: hidden;
+  text-overflow: ellipsis;
+}
+
+.trash-row__meta {
+  font-size: 11px;
+  color: #8b949e;
+}
+
+.trash-row__restore {
+  font-size: 11px;
+  padding: 4px 8px;
+  background: #238636;
+  color: #fff;
+  border: none;
+  border-radius: 4px;
+  cursor: pointer;
+}
+
+.trash-row__restore:hover {
+  background: #2ea043;
+}
+
+.trash-row__restore:disabled {
+  opacity: 0.5;
+  cursor: default;
+}