feat(nav): add collapsible sidebar and nested navigation groups

Refactor sidebar to support nested navigation groups for related entities.
Implement collapsible desktop sidebar with icon tooltips.

system-wordings.ts

@@ -43,6 +43,11 @@ export const systemWordingMessages = {
     },
     nav: {
       home: 'Home',
+      pokedex: 'Pokedex',
+      habitatDex: 'Habitat Dex',
+      collections: 'Collections',
+      mainGame: 'Main Game',
+      event: 'Event',
       pokemon: 'Pokemon',
       eventPokemon: 'Event Pokemon',
       habitats: 'Habitats',
@@ -63,6 +68,8 @@ export const systemWordingMessages = {
       main: 'Main navigation',
       openMenu: 'Open navigation',
       closeMenu: 'Close navigation',
+      collapseSidebar: 'Collapse sidebar',
+      expandSidebar: 'Expand sidebar',
       language: 'Language',
       profile: 'Profile',
       login: 'Log in',
@@ -1288,6 +1295,11 @@ export const systemWordingMessages = {
     },
     nav: {
       home: '首页',
+      pokedex: 'Pokedex',
+      habitatDex: 'Habitat Dex',
+      collections: 'Collections',
+      mainGame: 'Main Game',
+      event: 'Event',
       pokemon: 'Pokemon',
       eventPokemon: 'Event Pokemon',
       habitats: '栖息地',
@@ -1308,6 +1320,8 @@ export const systemWordingMessages = {
       main: '主导航',
       openMenu: '打开导航',
       closeMenu: '关闭导航',
+      collapseSidebar: '收起侧边栏',
+      expandSidebar: '展开侧边栏',
       language: '语言',
       profile: '个人资料',
       login: '登录',