From 82070924a8cd8bc49494b912dbb60af0cf86bcdd Mon Sep 17 00:00:00 2001
From: Yif <877193178@qq.com>
Date: Tue, 4 Aug 2026 14:20:48 +0800
Subject: [PATCH] =?UTF-8?q?polish(web):=20=E4=BE=A7=E8=BE=B9=E6=A0=8F?=
 =?UTF-8?q?=E6=BB=9A=E5=8A=A8=E7=BB=86=E8=8A=82?=
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1. 会话列表底部留白 12→48px，滚动到底时最后一项不再被底部渐变遮住。
2. 侧边栏滚动条默认隐藏，仅在指针悬停侧边栏区域时显示（通过主题滚动条变量绑透明实现，Firefox/WebKit 两条渲染路径同时生效）。
---
 .../ui-sidebar/src/client/SidebarRoot.module.css       | 10 ++++++++++
 .../src/client/WorkspaceBrowser.module.css             |  4 +++-
 2 files changed, 13 insertions(+), 1 deletion(-)

diff --git a/packages/client/ui-sidebar/src/client/SidebarRoot.module.css b/packages/client/ui-sidebar/src/client/SidebarRoot.module.css
index ebb47467af..3013570d16 100644
--- a/packages/client/ui-sidebar/src/client/SidebarRoot.module.css
+++ b/packages/client/ui-sidebar/src/client/SidebarRoot.module.css
@@ -15,6 +15,16 @@
   background: var(--dsw-specific-sidebar-fill);
   color: var(--dsw-alias-label-primary);
   font-size: 14px;
+  /* Scrollbar hides until the pointer is over the sidebar: rebind the
+     ui-theme scrollbar indirection (styles/scrollbar.css) to transparent;
+     the session list's scrollbar-gutter keeps layout stable either way. */
+  --dsh-scrollbar-thumb: transparent;
+  --dsh-scrollbar-thumb-hover: transparent;
+}
+
+.root:hover {
+  --dsh-scrollbar-thumb: var(--dsw-alias-scrollbar-bg-l1);
+  --dsh-scrollbar-thumb-hover: var(--dsw-alias-scrollbar-hover-l1);
 }
 
 /* Rail geometry (figma rail spec): 36x36 control boxes centered in the 56px
diff --git a/packages/client/ui-workspace/src/client/WorkspaceBrowser.module.css b/packages/client/ui-workspace/src/client/WorkspaceBrowser.module.css
index 970fc64e8b..f4238b0360 100644
--- a/packages/client/ui-workspace/src/client/WorkspaceBrowser.module.css
+++ b/packages/client/ui-workspace/src/client/WorkspaceBrowser.module.css
@@ -207,7 +207,9 @@
   flex: 1;
   min-height: 0;
   overflow-y: auto;
-  padding-bottom: 12px;
+  /* Clears the 72px bottom fade overlay: at scroll end the last row sits
+     above the gradient instead of under it. */
+  padding-bottom: 48px;
   /* Row trailing content (the relative time, and the hover action buttons
      that replace it) sits flush against the row's 8px right padding, so an
      overlaid scrollbar covers it. Reserving the gutter keeps the bar beside