styles：美化样式 #207

Merged

cfy777 merged 4 commits from feat/styles into main

2026-06-22 19:32:47 +08:00

Author	SHA1	Message	Date
cfy666	79d321c78a	fix: 自建情景在聊天面板与系统消息中正确显示图标和名称	2026-06-22 16:02:02 +08:00
cfy666	f1b9e4fcc1	fix: 系统消息最大宽度限制与居中对齐	2026-06-22 15:08:26 +08:00
cfy666	18aa5f1949	refactor: 场景配置与弹窗样式改用 CSS 变量，适配白色主题	2026-06-22 15:03:58 +08:00
cfy666	140a178993	fix: 侧栏收起时使用 visibility 隐藏避免闪烁	2026-06-22 14:43:04 +08:00