fix(frontend): preserve ansi colors in terminal effects

Limit stroke and shadow effects to default-foreground terminal text so
ANSI-colored output keeps its intended visual meaning.

Also enable terminal text stroke and shadow by default in frontend and
backend fallbacks, and align the dark preset and default xterm theme
with the new green night palette.

.helloagents/archive/_index.md

@@ -10,6 +10,7 @@
 | 202603250317 | ghcr-docker-publish | implementation | workspace-root | ghcr-docker-publish#D001 | ✅完成 |
 | 202603250532 | quickcommands-theme-alignment | implementation | frontend | - | ✅完成 |
 | 202603250547 | terminal-tab-scroll-restore | implementation | frontend | - | ✅完成 |
+| 202603250603 | dark-green-night-theme | implementation | frontend, backend | - | ✅完成 |
 | 202603251200 | workspace-workbench-monitor | implementation | frontend, backend | workspace-workbench-monitor#D001 | ✅完成 |
 
 ## 按月归档
@@ -18,6 +19,7 @@
 - [202603250317_ghcr-docker-publish](./2026-03/202603250317_ghcr-docker-publish/) - 新增 GHCR 镜像发布 workflow 并切换 compose 镜像来源
 - [202603250532_quickcommands-theme-alignment](./2026-03/202603250532_quickcommands-theme-alignment/) - 统一快捷指令视图按钮主题适配，移除残留硬编码 hover 色值
 - [202603250547_terminal-tab-scroll-restore](./2026-03/202603250547_terminal-tab-scroll-restore/) - 修复终端标签切换后的贴底/历史滚动恢复逻辑
+- [202603250603_dark-green-night-theme](./2026-03/202603250603_dark-green-night-theme/) - 将黑暗模式预设与终端默认主题统一调整为黑绿夜间风格
 - [202603251200_workspace-workbench-monitor](./2026-03/202603251200_workspace-workbench-monitor/) - `/workspace` 改为三栏 Workbench 布局，并新增开机累计流量监控
 
 ## 结果状态说明