fix: 视频流程树节点放大并修复分支线与节点的对齐错位

将 branch-tap 改为 flex:1 布局自动对齐行中心，
放大节点尺寸和间距使流程图在画布中更易阅读。

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

src/styles/pages/ecommerce-video.css

@@ -179,9 +179,9 @@
   min-height: 0;
   overflow: auto;
   background: #101318;
-  padding: 26px;
+  padding: 32px 40px;
   display: flex;
-  align-items: center;
+  align-items: stretch;
   justify-content: center;
 }
 
@@ -735,10 +735,10 @@
 
 .ecom-video-tree {
   display: flex;
-  align-items: center;
+  align-items: stretch;
   gap: 0;
   width: 100%;
-  min-height: 0;
+  min-height: 100%;
 }
 
 /* ── Source node ── */
@@ -746,9 +746,9 @@
   display: flex;
   flex-direction: column;
   align-items: center;
+  justify-content: center;
   gap: 10px;
   flex-shrink: 0;
-  align-self: center;
 }
 
 .ecom-video-tree-node {
@@ -762,8 +762,8 @@
 }
 
 .ecom-video-tree-node--source {
-  width: 150px;
-  height: 190px;
+  width: 180px;
+  height: 230px;
   flex-shrink: 0;
   border-color: #1c4d3a;
   background: #162820;
@@ -785,9 +785,9 @@
 
 /* ── Text node (分镜文本) ── */
 .ecom-video-tree-node--text {
-  min-width: 120px;
-  max-width: 150px;
-  padding: 14px 12px;
+  min-width: 140px;
+  max-width: 170px;
+  padding: 16px 14px;
   cursor: default;
   border-color: #2a3d30;
   background: #131d1a;
@@ -824,8 +824,8 @@
 /* ── Image node (分镜图) ── */
 .ecom-video-tree-node--image,
 .ecom-video-tree-node--video {
-  width: 150px;
-  height: 120px;
+  width: 170px;
+  height: 136px;
   flex-shrink: 0;
 }
 
@@ -919,7 +919,7 @@
 /* ── Trunk connector (分支连接线) ── */
 .ecom-video-tree__trunk {
   position: relative;
-  width: 48px;
+  width: 56px;
   flex-shrink: 0;
   align-self: stretch;
 }
@@ -928,7 +928,7 @@
   position: absolute;
   left: 0;
   top: 50%;
-  width: 24px;
+  width: 28px;
   height: 2px;
   background: #3a4550;
   transform: translateY(-50%);
@@ -948,10 +948,15 @@
 
 .ecom-video-tree__branches-line {
   position: absolute;
-  left: 24px;
+  left: 28px;
   top: 0;
   bottom: 0;
-  width: 24px;
+  width: 28px;
+  display: flex;
+  flex-direction: column;
+  justify-content: space-between;
+  align-items: stretch;
+  padding: 0;
 }
 
 .ecom-video-tree__branches-line::before {
@@ -965,24 +970,28 @@
 }
 
 .ecom-video-tree__branch-tap {
-  position: absolute;
-  left: 0;
+  position: relative;
+  flex: 1;
+  display: flex;
+  align-items: center;
+}
+
+.ecom-video-tree__branch-tap::before {
+  content: "";
+  display: block;
   width: 100%;
   height: 2px;
   background: #3a4550;
 }
 
-.ecom-video-tree__branch-tap:nth-child(1) { top: 0; }
-.ecom-video-tree__branch-tap:nth-child(2) { top: 50%; transform: translateY(-50%); }
-.ecom-video-tree__branch-tap:nth-child(3) { bottom: 0; }
-
 .ecom-video-tree__branch-tap::after {
   content: "";
   position: absolute;
   left: 0;
-  top: 0;
+  top: 50%;
+  transform: translateY(-50%);
   width: 100%;
-  height: 100%;
+  height: 2px;
   background: linear-gradient(90deg, transparent, #00ff88, transparent);
   animation: ecom-tree-branch-flow 2.4s ease-in-out infinite;
 }
@@ -1016,18 +1025,19 @@
 .ecom-video-tree__rows {
   display: flex;
   flex-direction: column;
-  justify-content: space-between;
-  gap: 20px;
+  gap: 0;
   flex: 1;
   min-width: 0;
-  align-self: center;
-  padding: 8px 0;
+  align-self: stretch;
+  padding: 0;
 }
 
 .ecom-video-tree__row {
   display: flex;
   align-items: center;
-  gap: 8px;
+  justify-content: flex-start;
+  flex: 1;
+  gap: 12px;
   animation: ecom-tree-row-in 480ms var(--ease-out-expo, cubic-bezier(0.16, 1, 0.3, 1)) both;
 }