feat: multi-material overlays, presentation guides, and release prebuilds

Align control/presentation with presentation screen rect and darkness z-order; sync window titles and session window cleanup. Pack Win/Mac/Linux with npmRebuild disabled and release-native-prep for classic-level and sharp.

Co-authored-by: Cursor <cursoragent@cursor.com>

app/renderer/editor/MaterialsModals.module.css

@@ -33,6 +33,28 @@
 .browserToolbarRow > * {
   width: 100%;
   min-width: 0;
+  display: flex;
+  flex: 1 1 0;
+}
+
+.browserToolbarRow > * > button {
+  flex: 1 1 auto;
+  width: 100%;
+  min-width: 0;
+}
+
+.browserToolbarZoomRow {
+  display: flex;
+  flex-wrap: wrap;
+  gap: 8px;
+}
+
+.browserToolbarFullBtn {
+  width: 100%;
+}
+
+.browserToolbarFullBtn > button {
+  width: 100%;
 }
 
 .browserToolbarHint {