fix: prevent keypress events from bubbling in decision tree drawer (#5993)

Fixes #5991

- Add keydown event handlers with stopPropagation() to prevent SvelteFlow 
  from receiving keypress events from text inputs in decision tree config
- Applied at individual input level (summary field) and container level 
  (configuration panel) to catch all input types
- Prevents accidental node deletion when typing in configuration inputs

Co-authored-by: claude[bot] <209825114+claude[bot]@users.noreply.github.com>
Co-authored-by: Ruben Fiszel <rubenfiszel@users.noreply.github.com>

frontend/src/lib/components/apps/editor/settingsPanel/DecisionTreeGraphEditor.svelte

@@ -57,7 +57,13 @@
 				</div>
 			</Pane>
 			<Pane size={40}>
-				<div class="h-full w-full bg-surface p-4 flex flex-col gap-6">
+				<div 
+					class="h-full w-full bg-surface p-4 flex flex-col gap-6"
+					on:keydown={(e) => {
+						// Prevent keyboard events from bubbling to SvelteFlow
+						e.stopPropagation()
+					}}
+				>
 					{#if selectedNode}
 						<Section label="Conditions" class="w-full flex flex-col gap-2">
 							<svelte:fragment slot="action">
@@ -92,6 +98,10 @@
 											renderCount++
 										}, 300)()
 									}}
+									on:keydown={(e) => {
+										// Prevent keyboard events from bubbling to SvelteFlow
+										e.stopPropagation()
+									}}
 								/>
 							</Label>