Migrate all remaining components to App Router navigation

- Add 'use client' directives to all remaining components
- Update imports from next/router to next/navigation
- Replace router.locale with getCookie('NEXT_LOCALE')
- Update LanguageSwitch to use router.refresh()
- Replace router.asPath with usePathname()

Components migrated:
- Common: SelectWithInput, Editor
- Layout: Header, Layout, MentionList, ElementToggle
- Misc: UpdateToast, SearchModal, RaidCombobox, FilterModal
- Misc: ChangelogUnit, HovercardHeader, LanguageSwitch
- Extra: GuidebookUnit, GuidebookResult
- Reps: GridRep, CharacterRep, WeaponRep, SummonRep

Added migration PRD documentation to track progress.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

components/ElementToggle/index.tsx

@@ -1,5 +1,6 @@
+'use client'
 import React, { useEffect, useState } from 'react'
-import { useRouter } from 'next/router'
+import { getCookie } from 'cookies-next'
 import { useTranslation } from 'next-i18next'
 import classNames from 'classnames'
 
@@ -12,10 +13,8 @@ interface Props {
 }
 
 const ElementToggle = ({ currentElement, sendValue, ...props }: Props) => {
-  // Router and localization
-  const router = useRouter()
-  const locale =
-    router.locale && ['en', 'ja'].includes(router.locale) ? router.locale : 'en'
+  // Localization
+  const locale = (getCookie('NEXT_LOCALE') as string) || 'en'
 
   const { t } = useTranslation('common')
 

components/Header/index.tsx

@@ -1,6 +1,6 @@
+'use client'
 import React, { useState } from 'react'
-import { deleteCookie } from 'cookies-next'
-import { useRouter } from 'next/router'
+import { deleteCookie, getCookie } from 'cookies-next'
 import { useTranslation } from 'next-i18next'
 import classNames from 'classnames'
 import clonedeep from 'lodash.clonedeep'
@@ -37,10 +37,8 @@ const Header = () => {
   // Localization
   const { t } = useTranslation('common')
 
-  // Router
-  const router = useRouter()
-  const locale =
-    router.locale && ['en', 'ja'].includes(router.locale) ? router.locale : 'en'
+  // Locale
+  const locale = (getCookie('NEXT_LOCALE') as string) || 'en'
 
   // State management
   const [alertOpen, setAlertOpen] = useState(false)

components/HovercardHeader/index.tsx

@@ -1,4 +1,5 @@
-import { useRouter } from 'next/router'
+'use client'
+import { getCookie } from 'cookies-next'
 
 import UncapIndicator from '~components/uncap/UncapIndicator'
 import WeaponLabelIcon from '~components/weapon/WeaponLabelIcon'
@@ -28,9 +29,7 @@ const Proficiency = [
 ]
 
 const HovercardHeader = ({ gridObject, object, type, ...props }: Props) => {
-  const router = useRouter()
-  const locale =
-    router.locale && ['en', 'ja'].includes(router.locale) ? router.locale : 'en'
+  const locale = (getCookie('NEXT_LOCALE') as string) || 'en'
 
   const overlay = () => {
     if (type === 'character') {

components/LanguageSwitch/index.tsx

@@ -1,5 +1,7 @@
+'use client'
 import React, { PropsWithChildren, useEffect, useState } from 'react'
-import { useRouter } from 'next/router'
+import { useRouter } from 'next/navigation'
+import { usePathname } from 'next/navigation'
 import { setCookie } from 'cookies-next'
 import { retrieveLocaleCookies } from '~utils/retrieveCookies'
 import * as SwitchPrimitive from '@radix-ui/react-switch'
@@ -14,6 +16,7 @@ export const LanguageSwitch = React.forwardRef<HTMLButtonElement, Props>(
   ) {
     // Router and locale data
     const router = useRouter()
+    const pathname = usePathname()
     const localeData = retrieveLocaleCookies()
 
     // State
@@ -30,7 +33,7 @@ export const LanguageSwitch = React.forwardRef<HTMLButtonElement, Props>(
       expiresAt.setDate(expiresAt.getDate() + 120)
 
       setCookie('NEXT_LOCALE', language, { path: '/', expires: expiresAt })
-      router.push(router.asPath, undefined, { locale: language })
+      router.refresh()
     }
 
     return (

components/Layout/index.tsx

@@ -1,5 +1,6 @@
+'use client'
 import { PropsWithChildren, useEffect, useState } from 'react'
-import { useRouter } from 'next/router'
+import { usePathname } from 'next/navigation'
 import { add, format } from 'date-fns'
 import { getCookie } from 'cookies-next'
 
@@ -11,7 +12,7 @@ import UpdateToast from '~components/toasts/UpdateToast'
 interface Props {}
 
 const Layout = ({ children }: PropsWithChildren<Props>) => {
-  const router = useRouter()
+  const pathname = usePathname()
   const [updateToastOpen, setUpdateToastOpen] = useState(false)
 
   useEffect(() => {
@@ -48,7 +49,7 @@ const Layout = ({ children }: PropsWithChildren<Props>) => {
   }
 
   const updateToast = () => {
-    const path = router.asPath.replaceAll('/', '')
+    const path = pathname.replaceAll('/', '')
 
     return (
       !['about', 'updates', 'roadmap'].includes(path) &&

components/MentionList/index.tsx

@@ -1,3 +1,4 @@
+'use client'
 import React, {
   forwardRef,
   useEffect,
@@ -5,7 +6,7 @@ import React, {
   useState,
 } from 'react'
 import { useTranslation } from 'next-i18next'
-import { useRouter } from 'next/router'
+import { getCookie } from 'cookies-next'
 import { SuggestionProps } from '@tiptap/suggestion'
 import classNames from 'classnames'
 
@@ -34,8 +35,7 @@ interface MentionProps extends SuggestionProps {
 
 export const MentionList = forwardRef<MentionRef, Props>(
   ({ items, ...props }: Props, forwardedRef) => {
-    const router = useRouter()
-    const locale = router.locale || 'en'
+    const locale = (getCookie('NEXT_LOCALE') as string) || 'en'
 
     const { t } = useTranslation('common')
 

components/about/ChangelogUnit/index.tsx

@@ -1,5 +1,6 @@
-import { useRouter } from 'next/router'
+'use client'
 import React, { useEffect, useState } from 'react'
+import { getCookie } from 'cookies-next'
 import api from '~utils/api'
 
 import styles from './index.module.scss'
@@ -19,10 +20,8 @@ const defaultProps = {
 }
 
 const ChangelogUnit = ({ id, type, image }: Props) => {
-  // Router
-  const router = useRouter()
-  const locale =
-    router.locale && ['en', 'ja'].includes(router.locale) ? router.locale : 'en'
+  // Locale
+  const locale = (getCookie('NEXT_LOCALE') as string) || 'en'
 
   // State
   const [item, setItem] = useState<Character | Weapon | Summon>()

components/common/Editor/index.tsx

@@ -1,6 +1,7 @@
+'use client'
 import { ComponentProps, useCallback, useEffect } from 'react'
 import { useEditor, EditorContent } from '@tiptap/react'
-import { useRouter } from 'next/router'
+import { getCookie } from 'cookies-next'
 import { useTranslation } from 'next-i18next'
 
 import StarterKit from '@tiptap/starter-kit'
@@ -44,9 +45,8 @@ const Editor = ({
   onUpdate,
   ...props
 }: Props) => {
-  // Hooks: Router
-  const router = useRouter()
-  const locale = router.locale || 'en'
+  // Hooks: Locale
+  const locale = (getCookie('NEXT_LOCALE') as string) || 'en'
 
   const { t } = useTranslation('common')
 

components/common/SelectWithInput/index.tsx

@@ -1,6 +1,7 @@
+'use client'
 // Core dependencies
 import React, { useEffect, useState } from 'react'
-import { useRouter } from 'next/router'
+import { getCookie } from 'cookies-next'
 import { useTranslation } from 'next-i18next'
 import classNames from 'classnames'
 
@@ -39,9 +40,7 @@ const SelectWithInput = ({
   sendValidity,
   sendValues,
 }: Props) => {
-  const router = useRouter()
-  const locale =
-    router.locale && ['en', 'ja'].includes(router.locale) ? router.locale : 'en'
+  const locale = (getCookie('NEXT_LOCALE') as string) || 'en'
   const { t } = useTranslation('common')
 
   // UI state

components/extra/GuidebookResult/index.tsx

@@ -1,5 +1,6 @@
+'use client'
 import React from 'react'
-import { useRouter } from 'next/router'
+import { getCookie } from 'cookies-next'
 
 import styles from './index.module.scss'
 
@@ -9,9 +10,7 @@ interface Props {
 }
 
 const GuidebookResult = (props: Props) => {
-  const router = useRouter()
-  const locale =
-    router.locale && ['en', 'ja'].includes(router.locale) ? router.locale : 'en'
+  const locale = (getCookie('NEXT_LOCALE') as string) || 'en'
 
   const guidebook = props.data
 

components/extra/GuidebookUnit/index.tsx

@@ -1,5 +1,6 @@
+'use client'
 import React, { useEffect, useState } from 'react'
-import { useRouter } from 'next/router'
+import { getCookie } from 'cookies-next'
 import { Trans, useTranslation } from 'next-i18next'
 import classNames from 'classnames'
 
@@ -36,9 +37,7 @@ const GuidebookUnit = ({
 }: Props) => {
   // Translations and locale
   const { t } = useTranslation('common')
-  const router = useRouter()
-  const locale =
-    router.locale && ['en', 'ja'].includes(router.locale) ? router.locale : 'en'
+  const locale = (getCookie('NEXT_LOCALE') as string) || 'en'
 
   // State: UI
   const [searchModalOpen, setSearchModalOpen] = useState(false)

components/filters/FilterModal/index.tsx

@@ -1,6 +1,6 @@
+'use client'
 import React, { useEffect, useRef, useState } from 'react'
 import { getCookie, setCookie } from 'cookies-next'
-import { useRouter } from 'next/router'
 import { Trans, useTranslation } from 'react-i18next'
 
 import { Dialog, DialogTrigger } from '~components/common/Dialog'
@@ -33,9 +33,8 @@ const MAX_WEAPONS = 13
 const MAX_SUMMONS = 8
 
 const FilterModal = (props: Props) => {
-  // Set up router
-  const router = useRouter()
-  const locale = router.locale
+  // Set up locale
+  const locale = (getCookie('NEXT_LOCALE') as string) || 'en'
 
   // Set up translation
   const { t } = useTranslation('common')

components/raids/RaidCombobox/index.tsx

@@ -1,5 +1,6 @@
+'use client'
 import { createRef, useCallback, useEffect, useState } from 'react'
-import { useRouter } from 'next/router'
+import { getCookie } from 'cookies-next'
 import { useTranslation } from 'react-i18next'
 import classNames from 'classnames'
 
@@ -66,9 +67,8 @@ interface Props {
 }
 
 const RaidCombobox = (props: Props) => {
-  // Set up router for locale
-  const router = useRouter()
-  const locale = router.locale || 'en'
+  // Set up locale from cookie
+  const locale = (getCookie('NEXT_LOCALE') as string) || 'en'
 
   // Set up translations
   const { t } = useTranslation('common')

components/reps/CharacterRep/index.tsx

@@ -1,5 +1,6 @@
+'use client'
 import React, { useEffect, useState } from 'react'
-import { useRouter } from 'next/router'
+import { getCookie } from 'cookies-next'
 import { useTranslation } from 'next-i18next'
 import 'fix-date'
 
@@ -17,10 +18,8 @@ const CHARACTERS_COUNT = 3
 
 const CharacterRep = (props: Props) => {
   // Localization for alt tags
-  const router = useRouter()
   const { t } = useTranslation('common')
-  const locale =
-    router.locale && ['en', 'ja'].includes(router.locale) ? router.locale : 'en'
+  const locale = (getCookie('NEXT_LOCALE') as string) || 'en'
 
   // Component state
   const [characters, setCharacters] = useState<GridArray<Character>>({})

components/reps/GridRep/index.tsx

@@ -1,8 +1,9 @@
+'use client'
 import React, { useEffect, useState } from 'react'
 import Link from 'next/link'
-import { useRouter } from 'next/router'
 import { useSnapshot } from 'valtio'
 import { useTranslation } from 'next-i18next'
+import { getCookie } from 'cookies-next'
 import classNames from 'classnames'
 import 'fix-date'
 
@@ -31,10 +32,8 @@ const GridRep = ({ party, loading, onClick, onSave }: Props) => {
 
   const { account } = useSnapshot(accountState)
 
-  const router = useRouter()
   const { t } = useTranslation('common')
-  const locale =
-    router.locale && ['en', 'ja'].includes(router.locale) ? router.locale : 'en'
+  const locale = (getCookie('NEXT_LOCALE') as string) || 'en'
 
   const [visible, setVisible] = useState(false)
   const [currentView, setCurrentView] = useState<

components/reps/SummonRep/index.tsx

@@ -1,5 +1,6 @@
+'use client'
 import React, { useEffect, useState } from 'react'
-import { useRouter } from 'next/router'
+import { getCookie } from 'cookies-next'
 
 import styles from './index.module.scss'
 
@@ -15,9 +16,7 @@ const SUMMONS_COUNT = 4
 
 const SummonRep = (props: Props) => {
   // Localization for alt tags
-  const router = useRouter()
-  const locale =
-    router.locale && ['en', 'ja'].includes(router.locale) ? router.locale : 'en'
+  const locale = (getCookie('NEXT_LOCALE') as string) || 'en'
 
   // Component state
   const [mainSummon, setMainSummon] = useState<GridSummon>()

components/reps/WeaponRep/index.tsx

@@ -1,5 +1,6 @@
+'use client'
 import React, { useEffect, useState } from 'react'
-import { useRouter } from 'next/router'
+import { getCookie } from 'cookies-next'
 
 import styles from './index.module.scss'
 import classNames from 'classnames'
@@ -15,9 +16,7 @@ const WEAPONS_COUNT = 9
 
 const WeaponRep = (props: Props) => {
   // Localization for alt tags
-  const router = useRouter()
-  const locale =
-    router.locale && ['en', 'ja'].includes(router.locale) ? router.locale : 'en'
+  const locale = (getCookie('NEXT_LOCALE') as string) || 'en'
 
   // Component state
   const [mainhand, setMainhand] = useState<GridWeapon>()

components/search/SearchModal/index.tsx

@@ -1,6 +1,6 @@
+'use client'
 import React, { useEffect, useState } from 'react'
 import { getCookie, setCookie } from 'cookies-next'
-import { useRouter } from 'next/router'
 import { useTranslation } from 'react-i18next'
 import InfiniteScroll from 'react-infinite-scroll-component'
 import cloneDeep from 'lodash.clonedeep'
@@ -38,9 +38,8 @@ interface Props extends DialogProps {
 }
 
 const SearchModal = (props: Props) => {
-  // Set up router
-  const router = useRouter()
-  const locale = router.locale
+  // Set up locale from cookie
+  const locale = (getCookie('NEXT_LOCALE') as string) || 'en'
 
   // Set up translation
   const { t } = useTranslation('common')

components/toasts/UpdateToast/index.tsx

@@ -1,5 +1,5 @@
+'use client'
 import React from 'react'
-import { useRouter } from 'next/router'
 import { setCookie } from 'cookies-next'
 import { add, format } from 'date-fns'
 import classNames from 'classnames'

prd/app-router-migration.md

@@ -0,0 +1,209 @@
+# App Router Migration PRD
+
+## Overview
+Complete migration from Next.js Pages Router to App Router by updating all components to use `next/navigation` instead of `next/router`.
+
+## Migration Requirements
+
+### Router API Changes
+- `useRouter()` from `next/router` → `useRouter()` from `next/navigation`
+- `router.query` → `useSearchParams()` hook
+- `router.pathname` → `usePathname()` hook  
+- `router.asPath` → combination of `usePathname()` + `useSearchParams()`
+- `router.push()` → stays the same
+- `router.replace()` → stays the same
+- `router.back()` → stays the same
+- `router.reload()` → `router.refresh()`
+- `router.prefetch()` → stays the same
+- `router.beforePopState()` → not available in App Router (needs alternative)
+- `router.events` → not available in App Router (needs alternative)
+
+### Import Updates Required
+All imports need to change from:
+```tsx
+import { useRouter } from 'next/router'
+```
+To:
+```tsx
+import { useRouter, usePathname, useSearchParams } from 'next/navigation'
+```
+
+## Files to Migrate
+
+### App Directory Files (Already using next/navigation - 6 files)
+These files already use `next/navigation` but should be verified:
+- [ ] `/app/teams/TeamsPageClient.tsx`
+- [ ] `/app/saved/SavedPageClient.tsx`
+- [ ] `/app/p/[party]/PartyPageClient.tsx`
+- [ ] `/app/new/NewPartyClient.tsx`
+- [ ] `/app/components/Header.tsx`
+- [ ] `/app/[username]/ProfilePageClient.tsx`
+
+### Pages Directory Files (1 file)
+- [ ] `/pages/about.tsx` - Needs migration to app router or update imports
+
+### Component Files - Auth (3 files)
+- [x] `/components/auth/LoginModal/index.tsx`
+- [x] `/components/auth/SignupModal/index.tsx`
+- [x] `/components/auth/AccountModal/index.tsx`
+
+### Component Files - Character (5 files)
+- [x] `/components/character/CharacterUnit/index.tsx`
+- [x] `/components/character/CharacterModal/index.tsx`
+- [x] `/components/character/CharacterHovercard/index.tsx`
+- [x] `/components/character/CharacterConflictModal/index.tsx`
+- [x] `/components/character/CharacterResult/index.tsx`
+
+### Component Files - Weapon (7 files)
+- [x] `/components/weapon/WeaponUnit/index.tsx`
+- [x] `/components/weapon/WeaponModal/index.tsx`
+- [x] `/components/weapon/WeaponKeySelect/index.tsx`
+- [x] `/components/weapon/WeaponHovercard/index.tsx`
+- [x] `/components/weapon/WeaponConflictModal/index.tsx`
+- [x] `/components/weapon/WeaponResult/index.tsx`
+- [x] `/components/weapon/WeaponLabelIcon/index.tsx`
+
+### Component Files - Summon (3 files)
+- [x] `/components/summon/SummonUnit/index.tsx`
+- [x] `/components/summon/SummonHovercard/index.tsx`
+- [x] `/components/summon/SummonResult/index.tsx`
+
+### Component Files - Party (5 files)
+- [x] `/components/party/PartyHeader/index.tsx`
+- [x] `/components/party/PartyHead/index.tsx`
+- [x] `/components/party/PartyFooter/index.tsx`
+- [x] `/components/party/PartyDropdown/index.tsx`
+- [x] `/components/party/Party/index.tsx`
+
+### Component Files - Job (7 files)
+- [x] `/components/job/JobSkillItem/index.tsx`
+- [x] `/components/job/JobSection/index.tsx`
+- [x] `/components/job/JobDropdown/index.tsx`
+- [x] `/components/job/JobAccessoryPopover/index.tsx`
+- [x] `/components/job/JobAccessoryItem/index.tsx`
+- [x] `/components/job/JobSkillResult/index.tsx`
+- [x] `/components/job/JobImage/index.tsx`
+
+### Component Files - Mastery (3 files)
+- [x] `/components/mastery/ExtendedMasterySelect/index.tsx`
+- [x] `/components/mastery/AxSelect/index.tsx`
+- [x] `/components/mastery/AwakeningSelectWithInput/index.tsx`
+
+### Component Files - Reps (4 files)
+- [x] `/components/reps/GridRep/index.tsx`
+- [x] `/components/reps/CharacterRep/index.tsx`
+- [x] `/components/reps/WeaponRep/index.tsx`
+- [x] `/components/reps/SummonRep/index.tsx`
+
+### Component Files - Common (2 files)
+- [x] `/components/common/SelectWithInput/index.tsx`
+- [x] `/components/common/Editor/index.tsx`
+
+### Component Files - Extra (2 files)
+- [x] `/components/extra/GuidebookUnit/index.tsx`
+- [x] `/components/extra/GuidebookResult/index.tsx`
+
+### Component Files - Other (11 files)
+- [x] `/components/toasts/UpdateToast/index.tsx`
+- [x] `/components/search/SearchModal/index.tsx`
+- [x] `/components/raids/RaidCombobox/index.tsx`
+- [x] `/components/filters/FilterModal/index.tsx`
+- [x] `/components/MentionList/index.tsx`
+- [x] `/components/Layout/index.tsx`
+- [x] `/components/LanguageSwitch/index.tsx`
+- [x] `/components/Header/index.tsx`
+- [x] `/components/ElementToggle/index.tsx`
+- [x] `/components/about/ChangelogUnit/index.tsx`
+- [x] `/components/HovercardHeader/index.tsx`
+
+### Utility Files (1 file)
+- [x] `/utils/changeLanguage.tsx`
+
+## Total Files to Migrate: 59
+
+## Migration Steps for Each File
+
+1. **Analyze current usage**
+   - Check how `router` is being used
+   - Identify which properties/methods are accessed
+   - Note any router.events listeners
+
+2. **Update imports**
+   - Change from `next/router` to `next/navigation`
+   - Add additional hooks if needed (`usePathname`, `useSearchParams`)
+
+3. **Update router usage**
+   - Replace `router.query` with `useSearchParams()`
+   - Replace `router.pathname` with `usePathname()`
+   - Update any other router property access
+
+4. **Handle edge cases**
+   - Router events (need alternative approach)
+   - beforePopState (need alternative approach)
+   - Dynamic route params (use `useParams()`)
+
+5. **Test the component**
+   - Ensure navigation still works
+   - Check query parameter handling
+   - Verify dynamic routes
+
+## Special Considerations
+
+### Router Events
+Files using `router.events` will need special handling as this is not available in App Router. Common patterns:
+- Route change start/complete events → Use loading.tsx or Suspense
+- Route change error → Use error boundaries
+
+### Query Parameters
+When migrating `router.query`:
+```tsx
+// Old (Pages Router)
+const { id, filter } = router.query
+
+// New (App Router)
+const searchParams = useSearchParams()
+const id = searchParams.get('id')
+const filter = searchParams.get('filter')
+```
+
+### Dynamic Route Parameters
+For dynamic segments like `[id]`:
+```tsx
+// Old (Pages Router)
+const { id } = router.query
+
+// New (App Router)
+import { useParams } from 'next/navigation'
+const params = useParams()
+const id = params.id
+```
+
+### Programmatic Navigation
+```tsx
+// Both routers (mostly the same)
+router.push('/path')
+router.replace('/path')
+router.back()
+
+// Refresh (different)
+// Old: router.reload()
+// New: router.refresh()
+```
+
+## Post-Migration Cleanup
+
+After all files are migrated:
+1. [ ] Remove `/pages` directory (except `/pages/api` if still needed)
+2. [ ] Remove Pages Router specific configuration
+3. [ ] Update `_app.tsx` dependencies if any remain
+4. [ ] Test all routes thoroughly
+5. [ ] Update any documentation
+
+## Success Criteria
+
+- [x] All components use `next/navigation` imports
+- [x] No references to `next/router` remain in components (only in pages/about.tsx which still needs migration)
+- [x] All navigation functionality works as before
+- [x] No console errors about "NextRouter was not mounted"
+- [x] App runs successfully with `npm run dev`
+- [ ] Build completes with `npm run build` (to be tested)