Add release date and episode # columns to admin lesson list with inline date editing; use local time for release dates; v2.8.2

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

src/App.css

@@ -6428,6 +6428,14 @@
 }
 .study-lesson-drag:active { cursor: grabbing; }
 
+.study-lesson-ep {
+  width: 44px;
+  flex-shrink: 0;
+  font-size: 0.82rem;
+  color: var(--admin-muted);
+  font-variant-numeric: tabular-nums;
+}
+
 .study-lesson-ref {
   width: 80px;
   flex-shrink: 0;
@@ -6436,6 +6444,19 @@
   font-variant-numeric: tabular-nums;
 }
 
+.study-lesson-release {
+  width: 190px;
+  flex-shrink: 0;
+  font-size: 0.8rem;
+  font-family: inherit;
+  color: var(--admin-text);
+  background: transparent;
+  border: 1px solid var(--admin-card-border);
+  border-radius: 4px;
+  padding: 0.2rem 0.4rem;
+  color-scheme: dark;
+}
+
 .study-lesson-title {
   flex: 1;
   font-size: 0.88rem;