fix: 修正 logo 中 N 和 G 字母造型

N 添加对角线笔画（█▄ █），G 添加内横杠（█ ▀█），
避免与 O 字母造型雷同。同步更新 ui.ts 中的硬编码 wordmark。

.opencode/command/rmslop.md

@@ -0,0 +1,15 @@
+---
+description: Remove AI code slop
+---
+
+Check the diff against dev, and remove all AI generated slop introduced in this branch.
+
+This includes:
+
+- Extra comments that a human wouldn't add or is inconsistent with the rest of the file
+- Extra defensive checks or try/catch blocks that are abnormal for that area of the codebase (especially if called by trusted / validated codepaths)
+- Casts to any to get around type issues
+- Any other style that is inconsistent with the file
+- Unnecessary emoji usage
+
+Report at the end with only a 1-3 sentence summary of what you changed