fix(workspace): single scroll area, drag cleanup, thin note titles with bundled Inter

- the workspace fills the window; only the note scrolls (also on phones, where the
  sideways scroll area used to scroll on its own)
- clear drag state on dragend, calmer sidebar toggle when collapsed
- ship Inter as variable font, light and larger note titles; header shows the
  title only after the big title scrolled away and stays one row on phones
- main builds show the package version without -dev

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

frontend/src/features/workspace/WorkspaceView.tsx

@@ -408,6 +408,17 @@ export const WorkspaceView: React.FC<WorkspaceViewProps> = ({
   }, []);
   const [draggingFolderPath, setDraggingFolderPath] = useState<string | null>(null);
   const [dragOverFolder, setDragOverFolder] = useState<string | null>(null);
+  // A drag that ends without a drop (released elsewhere, Escape) fires only dragend: clear every drag state
+  useEffect(() => {
+    const clear = () => {
+      setDraggingDocId(null);
+      setDraggingFolderPath(null);
+      setDragOverFolder(null);
+      setMergeHoverId(null);
+    };
+    document.addEventListener('dragend', clear);
+    return () => document.removeEventListener('dragend', clear);
+  }, []);
 
   // Rollup drilldown & View Mode
   const [todoFolderDrilldown, setTodoFolderDrilldown] = useState<string | null>(null);
@@ -1218,7 +1229,7 @@ export const WorkspaceView: React.FC<WorkspaceViewProps> = ({
   }, [tagsSummary, tagSearchQuery, tagSortBy]);
 
   return (
-    <div className="w-full space-y-3">
+    <div className="w-full h-full min-h-0 flex flex-col gap-3">
       {/* Top Header: Workspace Tabs & Actions */}
       <div className="flex flex-wrap items-center justify-between gap-2 border-b border-border pb-2">
         {/* Workspace selector tabs & left sidebar toggle; on phones the three tabs share the full width */}
@@ -1231,8 +1242,8 @@ export const WorkspaceView: React.FC<WorkspaceViewProps> = ({
               subView !== 'editor'
                 ? 'opacity-35 bg-canvas border-border text-faint cursor-not-allowed pointer-events-none'
                 : isSidebarCollapsed
-                ? 'bg-panel border-accent text-accent cursor-pointer'
-                : 'bg-canvas border-border text-muted hover:text-main cursor-pointer'
+                ? 'bg-canvas border-border text-accent hover:bg-panel cursor-pointer'
+                : 'bg-canvas border-border text-muted hover:text-main hover:bg-panel cursor-pointer'
             }`}
             title={
               subView !== 'editor'
@@ -1436,7 +1447,7 @@ export const WorkspaceView: React.FC<WorkspaceViewProps> = ({
       </div>
 
       {/* Main Workspace Split Pane */}
-      <div className="flex h-[calc(100vh-7.5rem)] bg-editor rounded-card border border-border overflow-hidden">
+      <div className="flex flex-1 min-h-0 bg-editor rounded-card border border-border overflow-hidden">
         {/* LEFT MASTER SIDEBAR */}
         <aside
           className={`${