fix: 调整节点视图自动适配行为

修改 VueFlow 初始适配视图为 false，改为手动控制适配
优化根节点添加时的视图适配，增加缩放效果
调整子节点适配逻辑，包含所有子节点并允许更大缩放

src/App.vue

@@ -156,7 +156,7 @@ const fitToView = () => {
         <div class="flex-grow relative">
             <VueFlow
                 :default-edge-options="{ type: config.edgeType }"
-                :fit-view-on-init="true"
+                :fit-view-on-init="false"
                 class="bg-white"
                 :class="{ 'space-pressed': isSpacePressed }"
                 :pan-on-drag="panOnDrag"

src/composables/useThinkFlow.ts

@@ -920,6 +920,11 @@ export function useThinkFlow({ t, locale }: { t: Translate; locale: Ref<string>
                 targetPosition: Position.Left
             })
 
+            // 初始添加根节点时进行一次较大的缩放，突出根节点
+            setTimeout(() => {
+                fitView({ nodes: [rootId], padding: 0.4, duration: 600, maxZoom: 1.2 })
+            }, 50)
+
             ideaInput.value = ''
         } else {
             const node = flowNodes.value.find(n => n.id === parentNode.id)
@@ -990,12 +995,13 @@ export function useThinkFlow({ t, locale }: { t: Translate; locale: Ref<string>
                     const childEdges = flowEdges.value.filter(e => e.source === currentParentId)
                     const childIds = childEdges.map(e => e.target)
 
-                    const nodesToFit = [currentParentId, ...childIds.slice(0, 3)]
+                    const nodesToFit = [currentParentId, ...childIds]
 
                     fitView({
                         nodes: nodesToFit,
-                        padding: 0.25,
-                        duration: 1000
+                        padding: 0.15, // 极小边距，使内容充满屏幕
+                        duration: 1000,
+                        maxZoom: 1.2 // 允许更大的缩放
                     })
                 }, 100)
             }