improve note select

frontend/src/lib/components/graph/FlowGraphV2.svelte

@@ -480,10 +480,7 @@
 	// Keyboard event handling
 	function handleKeyDown(event: KeyboardEvent) {
 		selectionManager.handleKeyDown(event, nodes)
-	}
-
-	function handleKeyUp(_event: KeyboardEvent) {
-		// Keep for potential future use
+		noteManager.handleKeyDown(event)
 	}
 
 	async function updateStores() {
@@ -666,16 +663,10 @@
 			}
 		}
 
-		function globalKeyUpHandler(event: KeyboardEvent) {
-			handleKeyUp(event)
-		}
-
 		document.addEventListener('keydown', globalKeyDownHandler)
-		document.addEventListener('keyup', globalKeyUpHandler)
 
 		return () => {
 			document.removeEventListener('keydown', globalKeyDownHandler)
-			document.removeEventListener('keyup', globalKeyUpHandler)
 		}
 	})
 

frontend/src/lib/components/graph/noteManager.svelte.ts

@@ -334,4 +334,12 @@ export class NoteManager {
 	isNoteSelected(noteId: string): boolean {
 		return this.selectedNoteId === noteId
 	}
+
+	// Handle keyboard shortcuts
+	handleKeyDown(event: KeyboardEvent) {
+		if (event.key === 'Escape') {
+			// Escape key clears selection regardless of mode
+			this.clearNoteSelection()
+		}
+	}
 }