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/control/ControlApp.module.css

@@ -271,6 +271,7 @@
 
 .historyTitle {
   font-weight: 800;
+  min-width: 0;
 }
 
 .emptyStory {
@@ -356,7 +357,7 @@
 
 .branchGrid {
   display: grid;
-  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
+  grid-template-columns: repeat(3, minmax(0, 1fr));
   gap: 12px;
 }
 
@@ -367,6 +368,8 @@
   padding: 12px;
   display: grid;
   gap: 10px;
+  min-width: 0;
+  max-width: 100%;
 }
 
 .branchCardHeader {
@@ -383,6 +386,7 @@
 
 .branchName {
   font-weight: 900;
+  min-width: 0;
 }
 
 .branchCardReturn {