fix: make splitter state key position-aware to prevent shared widths between left and right panels

When sidebar location is set to right, left-side panels (e.g. Workflow
overview) and right-side panels (e.g. Job History) were sharing the same
PrimeVue Splitter state key, causing them to apply each other's widths.

Include sidebarLocation and offside panel visibility in the state key so
each layout configuration persists its own panel sizes independently.

Fixes #9440

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/components/LiteGraphCanvasSplitterOverlay.vue

@@ -167,13 +167,19 @@ const sidebarPanelVisible = computed(
   () => activeSidebarTab.value !== null && !isBuilderMode.value
 )
 
-const sidebarStateKey = computed(() => {
+const sidebarTabKey = computed(() => {
   return unifiedWidth.value
     ? 'unified-sidebar'
     : // When no tab is active, use a default key to maintain state
       (activeSidebarTabId.value ?? 'default-sidebar')
 })
 
+const sidebarStateKey = computed(() => {
+  const base = sidebarTabKey.value
+  const suffix = showOffsideSplitter.value ? '-with-offside' : ''
+  return `${base}-${sidebarLocation.value}${suffix}`
+})
+
 /**
  * Avoid triggering default behaviors during drag-and-drop, such as text selection.
  */