fix(journey): preview graph nodes on hover

packages/client/src/views/hermes/JourneyView.vue

@@ -50,6 +50,7 @@ const canvasRef = ref<HTMLCanvasElement | null>(null)
 const canvasWrapRef = ref<HTMLElement | null>(null)
 const selectedId = ref('')
 const hoverId = ref('')
+const hoverPosition = ref({ x: 0, y: 0 })
 const hoverCategory = ref('')
 const playing = ref(false)
 const playbackIndex = ref(-1)
@@ -77,6 +78,15 @@ const activePointers = new Map<number, { x: number; y: number }>()
 const nodes = computed(() => data.value?.graph.nodes || [])
 const edges = computed(() => data.value?.graph.edges || [])
 const selectedNode = computed(() => nodes.value.find(node => node.id === selectedId.value) || null)
+const hoverNode = computed(() => visibleSceneNodes.value.find(node => node.id === hoverId.value) || null)
+const hoverPreviewStyle = computed(() => {
+  const wrap = canvasWrapRef.value
+  const maxWidth = Math.min(300, Math.max(0, (wrap?.clientWidth || 0) - 16))
+  return {
+    left: `${Math.max(8, Math.min(hoverPosition.value.x + 16, (wrap?.clientWidth || 0) - maxWidth - 8))}px`,
+    top: `${Math.max(8, Math.min(hoverPosition.value.y + 16, (wrap?.clientHeight || 0) - 168))}px`,
+  }
+})
 const playbackNodes = computed(() =>
   nodes.value
     .map((node, index) => ({ node, index }))
@@ -467,6 +477,7 @@ function pointerPosition(event: MouseEvent | PointerEvent | WheelEvent): { x: nu
 }
 
 function handlePointerDown(event: PointerEvent) {
+  hoverId.value = ''
   activePointers.set(event.pointerId, { x: event.clientX, y: event.clientY })
   if (activePointers.size === 2) {
     const pointers = [...activePointers.values()]
@@ -485,9 +496,13 @@ function handlePointerMove(event: PointerEvent) {
   if (activePointers.has(event.pointerId)) {
     activePointers.set(event.pointerId, { x: event.clientX, y: event.clientY })
   }
-  const pos = pointerPosition(event)
-  const hit = hitTest(pos.x, pos.y)
-  hoverId.value = hit?.id || ''
+  if (!dragging && activePointers.size === 0 && event.pointerType !== 'touch') {
+    const pos = pointerPosition(event)
+    hoverId.value = hitTest(pos.x, pos.y)?.id || ''
+    hoverPosition.value = pos
+  } else {
+    hoverId.value = ''
+  }
 
   if (activePointers.size >= 2) {
     const pointers = [...activePointers.values()]
@@ -536,6 +551,7 @@ function handleClick(event: MouseEvent) {
 
 function handleWheel(event: WheelEvent) {
   event.preventDefault()
+  hoverId.value = ''
   zoom = Math.max(MIN_ZOOM, Math.min(MAX_ZOOM, zoom + (event.deltaY > 0 ? -0.08 : 0.08)))
 }
 
@@ -674,9 +690,14 @@ watch(sceneNodes, () => {
             @pointermove="handlePointerMove"
             @pointerup="handlePointerUp"
             @pointercancel="handlePointerUp"
+            @pointerleave="hoverId = ''"
             @click="handleClick"
             @wheel="handleWheel"
           />
+          <div v-if="hoverNode" class="node-preview" :style="hoverPreviewStyle" role="tooltip">
+            <strong>{{ detailTitle(hoverNode) }}</strong>
+            <p v-if="isMemoryNode(hoverNode) && memoryText(hoverNode)">{{ memoryText(hoverNode) }}</p>
+          </div>
           <div class="galaxy-hud">
             <span>{{ data?.profile || '-' }}</span>
             <span>{{ visibleSceneNodes.length }} {{ t('journey.nodes') }}</span>
@@ -828,6 +849,35 @@ watch(sceneNodes, () => {
   }
 }
 
+.node-preview {
+  position: absolute;
+  z-index: 3;
+  box-sizing: border-box;
+  width: min(300px, calc(100% - 16px));
+  max-height: 152px;
+  overflow: hidden;
+  padding: 10px 12px;
+  border: 1px solid $border-color;
+  border-radius: $radius-md;
+  background: $bg-secondary;
+  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.28);
+  color: $text-primary;
+  font-size: 12px;
+  line-height: 1.5;
+  overflow-wrap: anywhere;
+  pointer-events: none;
+
+  strong { display: block; }
+  p {
+    margin: 4px 0 0;
+    white-space: pre-wrap;
+    display: -webkit-box;
+    -webkit-line-clamp: 5;
+    -webkit-box-orient: vertical;
+    overflow: hidden;
+  }
+}
+
 .galaxy-hud {
   position: absolute;
   left: 16px;