style: update border-radius and padding values across components

- standardize border-radius from 8px to 6px for consistent styling
- adjust padding values from 1rem to 0.75rem for better visual hierarchy
- remove redundant overflow-y properties for cleaner code

docs/.vitepress/theme/components/appendix/component-state-management/ComponentHierarchyDemo.vue

@@ -194,12 +194,12 @@ const selectNode = (nodeId) => {
 <style scoped>
 .component-hierarchy-demo {
   border: 1px solid var(--vp-c-divider);
-  border-radius: 8px;
+  border-radius: 6px;
   background: var(--vp-c-bg-soft);
-  padding: 1rem;
-  margin: 1rem 0;
-  max-height: 600px;
-  overflow-y: auto;
+  padding: 0.75rem;
+  margin: 0.5rem 0;
+  
+  
 }
 
 .demo-header {
@@ -242,7 +242,7 @@ const selectNode = (nodeId) => {
 .demo-content {
   background: var(--vp-c-bg);
   border-radius: 6px;
-  padding: 1rem;
+  padding: 0.75rem;
   margin-bottom: 0.75rem;
 }
 
@@ -290,7 +290,7 @@ const selectNode = (nodeId) => {
   padding: 0.75rem 1rem;
   background: var(--vp-c-bg-soft);
   border: 2px solid var(--vp-c-divider);
-  border-radius: 8px;
+  border-radius: 6px;
   cursor: pointer;
   transition: all 0.2s ease;
   min-width: 180px;
@@ -346,7 +346,7 @@ const selectNode = (nodeId) => {
 
 .node-details {
   margin-top: 1rem;
-  padding: 1rem;
+  padding: 0.75rem;
   background: var(--vp-c-bg-soft);
   border-radius: 6px;
   border: 1px solid var(--vp-c-divider);