style: optimize gen2D deck layout, animations, and visual hierarchy

- style-keys.md: add v-clicks to 3x2 grid for staggered animation
- eino-graph.md: two-column layout (code left, Items right)
- eino-deep-dive.md: two-column layout for both slides, code+Items side-by-side
- async-deep-dive.md: two-column layout for both slides, SVG integrated
- harness.md: two-column layout for slide 1 (code left, Items right)
- request-journey.md: two-column layout for journey steps
- data-model.md: add v-clicks to grid items, increase diagram height
- architecture/pipeline/prompt-agent: increase SVG max-height for better visibility

decks/gen2D/pages/eino-deep-dive.md

@@ -2,7 +2,9 @@
 
 有向图构建与本地状态管理
 
-<div class="mt-2">
+<div class="grid grid-cols-2 gap-4 mt-2">
+
+<div>
 
 ```go {1-5|7-11|all}
 g := compose.NewGraph[PipelineInput, PipelineOutput](
@@ -19,6 +21,8 @@ g.AddLambdaNode(nodePromptOptimizer, &compose.Lambda{
 
 </div>
 
+<div class="flex flex-col justify-center">
+
 <v-clicks>
 
 <Item title="WithGenLocalState — 隔离的执行上下文">
@@ -31,13 +35,19 @@ PreHandler 从全局 State 提取当前节点所需字段；PostHandler 将节
 
 </v-clicks>
 
+</div>
+
+</div>
+
 ---
 
 # Eino Graph 深入 — 分支路由与重试
 
 QualitySupervisor 驱动的条件分支
 
-<div class="mt-2">
+<div class="grid grid-cols-2 gap-4 mt-2">
+
+<div>
 
 ```go {1-10|all}
 g.AddBranch(nodeQualitySupervisor, compose.NewGraphBranch(
@@ -59,6 +69,8 @@ g.AddBranch(nodeQualitySupervisor, compose.NewGraphBranch(
 
 </div>
 
+<div class="flex flex-col justify-center">
+
 <v-clicks>
 
 <Item title="路由逻辑">
@@ -72,5 +84,9 @@ g.AddBranch(nodeQualitySupervisor, compose.NewGraphBranch(
 </v-clicks>
 
 <div class="flex justify-center mt-2">
-  <img src="../public/pipeline-detail.svg" class="w-full max-h-[200px] object-contain" />
+  <img src="../public/pipeline-detail.svg" class="w-full max-h-[160px] object-contain" />
+</div>
+
+</div>
+
 </div>