Update side toolbar menu (#4946)

Side toolbar menu UI updates

## Summary

- Currently the template modal is very hidden. Many users do not find it
- The current icons are quite aleatory 

## Changes

 **What**: 
- Add templates shortcut button
- Add item label in normal size
- Use custom icon

Critical design decisions or edge cases that need attention:
- Sidebar tabs registered using custom icons will have their associated
command registed with an undefined icon (currently only string icons are
accepted, not components). I couldn't see anywhere directly using this
icon, but we should consider autogenerating an icon font so we can use
classes for our custom icons (or locating and updating locations to
support both icon types)

## Screenshots (if applicable)
Normal mode:
<img width="621" height="1034" alt="image"
src="https://github.com/user-attachments/assets/c1d1cee2-004e-4ff8-b3fa-197329b0d2ae"
/>

Small mode:
<img width="176" height="325" alt="image"
src="https://github.com/user-attachments/assets/3824b8f6-bc96-4e62-aece-f0265113d2e3"
/>

┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-4946-Update-side-toolbar-menu-24d6d73d365081c5b2bdc0ee8b61dc50)
by [Unito](https://www.unito.io)

---------

Co-authored-by: github-actions <github-actions@github.com>

src/locales/ko/main.json

@@ -1197,6 +1197,13 @@
     "browseTemplates": "예제 템플릿 탐색",
     "downloads": "다운로드",
     "helpCenter": "도움말 센터",
+    "labels": {
+      "models": "모델",
+      "nodes": "노드",
+      "queue": "대기열",
+      "templates": "템플릿",
+      "workflows": "워크플로우"
+    },
     "logout": "로그아웃",
     "modelLibrary": "모델 라이브러리",
     "newBlankWorkflow": "새 빈 워크플로 만들기",
@@ -1234,6 +1241,7 @@
       },
       "showFlatList": "평면 목록 표시"
     },
+    "templates": "템플릿",
     "workflowTab": {
       "confirmDelete": "정말로 이 워크플로를 삭제하시겠습니까?",
       "confirmDeleteTitle": "워크플로 삭제",