chore: update to nuxt 3.20

[IMB11]

Blocked by #4990

Migrates to nuxt 3.20, done incrementally to ensure things didn't break.

Updates app-frontend to use Vite 6

Details

Nuxt 3.14 → 3.20.2 Migration Summary

Nuxt 3.14 → Nuxt 3.15.4 (Vite 6)

• Updated nuxt to 3.15.4
• Updated @vitejs/plugin-vue to ^6.0.3
• Updated vite to ^6.0.0 in app-frontend (was causing pnpm to hoist Vite 5)
• Added floating-vue/nuxt module with vite.ssr.noExternal: ['v-tooltip']
• Deleted unused src/plugins/floating-vue.js

Nuxt 3.15.4 → Nuxt 3.16.2 (Unhead v2)

• Updated nuxt to 3.16.2
• Set compatibilityDate: '2025-01-01'
• Added "type": "module" to packages/tooling-config/package.json
• Removed explicit @nuxt/devtools (conflicts with bundled version)

Nuxt 3.16.2 → Nuxt 3.17.5 (Pinia 3 + i18n v9)

• Updated nuxt to 3.17.5
• Updated pinia to ^3.0.0 (both frontend and app-frontend)
• Updated @pinia/nuxt to ^0.11.3
• Updated @nuxtjs/i18n to ^9.0.0
• Updated vue-i18n to ^10.0.0 (app-frontend and packages/ui)
• Moved i18n.config.ts from src/ to project root
• Updated glob path in i18n.config.ts to ./src/locales/*/index.json
• Added bundle.optimizeTranslationDirective: false to silence deprecation warning

Nuxt 3.17.5 → Nuxt 3.20.2 (Final)

• Updated nuxt to ^3.20.2
• Removed eslint from frontend devDeps (inherits from tooling-config)
• Added @modrinth/tooling-config as devDependency
• Updated apexcharts to ^4.0.0 in packages/ui
• Added vue-eslint-parser ^10.1.3 to tooling-config
• Added <NuxtRouteAnnouncer /> to app.vue (accessibility)

[IMB11]

Needs migration to CF workers rather than pages to deploy