merge #130: drag-release bounce, session-delete terminal cleanup, silent resize (chalei1122-cell)

# Conflicts:
#	src/client/Sidebar.tsx

src/client/sidebar.module.css

@@ -182,7 +182,7 @@
 }
 
 .panelResizeActive {
-  background: var(--dsw-alias-interactive-bg-hover-accent);
+  /* Drag feedback disabled by local preference: no highlight while resizing. */
 }
 
 .panelBody {
@@ -267,7 +267,7 @@ body[data-dsh-sidebar-dragging] .bottomPanel {
 }
 
 .bottomResizeActive {
-  background: var(--dsw-alias-interactive-bg-hover-accent);
+  /* Drag feedback disabled by local preference: no highlight while resizing. */
 }
 
 /* The bottom panel's close control: the app's icon-button pattern (28px
@@ -504,8 +504,8 @@ body[data-dsh-sidebar-dragging] .bottomPanel {
   touch-action: none;
 }
 
-.cornerHandle:hover,
-.cornerHandle[data-dragging] {
+.cornerHandle:hover {
+  /* Only hover feedback stays; dragging highlight disabled by local preference. */
   background: var(--dsw-alias-interactive-bg-hover-accent);
 }