Refactor filter panels and enhance sidebar functionality

- Updated filter panel toggle icons from chevron-up to chevron-down across multiple pages for consistency.
- Added 'collapsed' class to filter content divs to manage visibility state.
- Enhanced library page button for tidying up media items, replacing the trash icon with a custom SVG broom icon.
- Improved CSS styles for sidebar and page header to ensure visibility and proper layout when the sidebar is collapsed.
- Introduced JavaScript functionality to manage sidebar width and state, including theme toggle for light/dark mode.
- Created a new notification drawer template that adapts based on the compact view state.

custom/otssignange/css/override-dark.css

@@ -270,6 +270,26 @@ hr {
   padding: 0;
 }
 
+/* Dark-mode repair overrides: ensure sidebar doesn't draw a vertical divider */
+#sidebar-wrapper,
+.ots-sidebar {
+  border-right: none !important;
+  box-shadow: none !important;
+}
+
+/* Hide pseudo-elements that might draw a divider */
+.ots-sidebar::before,
+.ots-sidebar::after,
+#sidebar-wrapper::before,
+#sidebar-wrapper::after,
+#page-wrapper::before,
+#page-wrapper::after {
+  content: none !important;
+  display: none !important;
+  background: transparent !important;
+  box-shadow: none !important;
+}
+
 /* Sidebar Main Item */
 .ots-sidebar li.sidebar-main > a {
   display: flex;
@@ -740,7 +760,9 @@ textarea:focus {
 
 .modal-content {
   border-radius: var(--ots-radius-lg);
-  background-color: var(--ots-surface-2) !important;
+  background-color: var(--color-surface) !important;
+  color: var(--color-text-primary) !important;
+  border: 1px solid var(--color-border) !important;
 }
 
 .modal,
@@ -748,6 +770,7 @@ textarea:focus {
 .modal-body,
 .modal-footer {
   background-color: transparent !important;
+  color: var(--color-text-primary) !important;
 }
 
 .modal-backdrop,
@@ -759,7 +782,7 @@ textarea:focus {
 }
 
 .modal-footer {
-  border-top: 1px solid var(--ots-border);
+  border-top: 1px solid var(--color-border) !important;
 }
 
 /* =============================================================================