diff --git a/apps/frontend/nuxt.config.ts b/apps/frontend/nuxt.config.ts
index 0f9147e55f..8a865bebf5 100644
--- a/apps/frontend/nuxt.config.ts
+++ b/apps/frontend/nuxt.config.ts
@@ -222,7 +222,13 @@ export default defineNuxtConfig({
 			},
 		},
 	},
-	modules: ['@nuxtjs/i18n', '@pinia/nuxt', 'floating-vue/nuxt', '@sentry/nuxt/module'],
+	modules: [
+		'@nuxtjs/i18n',
+		'@pinia/nuxt',
+		'floating-vue/nuxt',
+		// Sentry causes rollup-plugin-inject errors in dev, only enable in production
+		...(isProduction() ? ['@sentry/nuxt/module'] : []),
+	],
 	floatingVue: {
 		themes: {
 			'ribbit-popout': {
@@ -314,7 +320,7 @@ export default defineNuxtConfig({
 	compatibilityDate: '2025-01-01',
 	telemetry: false,
 	experimental: {
-		asyncContext: isProduction(),
+		asyncContext: false,
 	},
 	sourcemap: { client: 'hidden' },
 	sentry: {
diff --git a/apps/frontend/src/utils/analytics.js b/apps/frontend/src/utils/analytics.js
index cf933a6952..cfa73703db 100644
--- a/apps/frontend/src/utils/analytics.js
+++ b/apps/frontend/src/utils/analytics.js
@@ -1,6 +1,5 @@
 import dayjs from 'dayjs'
 import { computed, ref, watch } from 'vue'
-import { useI18n } from 'vue-i18n'
 
 // note: build step can miss unix import for some reason, so
 // we have to import it like this
@@ -8,7 +7,8 @@ import { useI18n } from 'vue-i18n'
 const { unix } = dayjs
 
 export function useCountryNames(style = 'long') {
-	const { locale } = useI18n()
+	const { $i18n } = useNuxtApp()
+	const locale = $i18n.locale
 	const displayNames = computed(
 		() => new Intl.DisplayNames([locale.value], { type: 'region', style }),
 	)
diff --git a/apps/frontend/wrangler.jsonc b/apps/frontend/wrangler.jsonc
index 340b5c6baa..dc240cdf94 100644
--- a/apps/frontend/wrangler.jsonc
+++ b/apps/frontend/wrangler.jsonc
@@ -31,6 +31,7 @@
 	},
 	"vars": {
 		"ENVIRONMENT": "production",
+		"SENTRY_ENVIRONMENT": "production",
 		"BASE_URL": "https://api.modrinth.com/v2/",
 		"BROWSER_BASE_URL": "https://api.modrinth.com/v2/",
 		"PYRO_BASE_URL": "https://archon.modrinth.com/",
@@ -45,6 +46,7 @@
 			"routes": ["staging.modrinth.com/*"],
 			"vars": {
 				"ENVIRONMENT": "staging",
+				"SENTRY_ENVIRONMENT": "staging",
 				"BASE_URL": "https://staging-api.modrinth.com/v2/",
 				"BROWSER_BASE_URL": "https://staging-api.modrinth.com/v2/",
 				"PYRO_BASE_URL": "https://staging-archon.modrinth.com/",
diff --git a/packages/ui/src/components/base/IntlFormatted.vue b/packages/ui/src/components/base/IntlFormatted.vue
index 755cc59b82..5fe6b97e0b 100644
--- a/packages/ui/src/components/base/IntlFormatted.vue
+++ b/packages/ui/src/components/base/IntlFormatted.vue
@@ -1,9 +1,8 @@
 <script setup lang="ts">
 import IntlMessageFormat, { type FormatXMLElementFn, type PrimitiveType } from 'intl-messageformat'
 import { computed, useSlots, type VNode } from 'vue'
-import { useI18n } from 'vue-i18n'
 
-import type { MessageDescriptor } from '../../composables/i18n'
+import { getSafeI18n, type MessageDescriptor } from '../../composables/i18n'
 
 const props = defineProps<{
 	messageId: MessageDescriptor
@@ -11,7 +10,7 @@ const props = defineProps<{
 }>()
 
 const slots = useSlots()
-const { t, locale } = useI18n()
+const { t, locale } = getSafeI18n()
 
 const formattedParts = computed(() => {
 	const key = props.messageId.id
diff --git a/packages/ui/src/composables/how-ago.ts b/packages/ui/src/composables/how-ago.ts
index 489a4494a6..1290ccfdef 100644
--- a/packages/ui/src/composables/how-ago.ts
+++ b/packages/ui/src/composables/how-ago.ts
@@ -1,5 +1,6 @@
 import { computed, type ComputedRef } from 'vue'
-import { useI18n } from 'vue-i18n'
+
+import { getSafeI18n } from './i18n'
 
 export type Formatter = (value: Date | number, options?: FormatOptions) => string
 
@@ -10,7 +11,7 @@ export interface FormatOptions {
 const formatters = new Map<string, ComputedRef<Intl.RelativeTimeFormat>>()
 
 export function useRelativeTime(): Formatter {
-	const { locale } = useI18n()
+	const { locale } = getSafeI18n()
 
 	const formatterRef = computed(
 		() =>
diff --git a/packages/ui/src/composables/i18n.ts b/packages/ui/src/composables/i18n.ts
index a85c386de0..4a816fc749 100644
--- a/packages/ui/src/composables/i18n.ts
+++ b/packages/ui/src/composables/i18n.ts
@@ -1,8 +1,28 @@
 import IntlMessageFormat from 'intl-messageformat'
 import type { Ref } from 'vue'
-import type { CompileError, MessageCompiler, MessageContext } from 'vue-i18n'
+import type { CompileError, Composer, MessageCompiler, MessageContext } from 'vue-i18n'
 import { useI18n } from 'vue-i18n'
 
+/**
+ * Get i18n instance, preferring Nuxt's $i18n to avoid vue-i18n's
+ * getCurrentInstance() issues on edge runtimes with concurrent SSR requests.
+ */
+export function getSafeI18n(): Pick<Composer, 't' | 'locale'> {
+	// Try Nuxt's $i18n first (avoids Error 27 on Cloudflare Workers)
+	if (typeof useNuxtApp !== 'undefined') {
+		try {
+			const { $i18n } = useNuxtApp()
+			if ($i18n) {
+				return { t: $i18n.t, locale: $i18n.locale }
+			}
+		} catch {
+			// Not in Nuxt context, fall through
+		}
+	}
+	// Fallback to vue-i18n's useI18n
+	return useI18n()
+}
+
 export interface MessageDescriptor {
 	id: string
 	defaultMessage?: string
@@ -174,7 +194,7 @@ export interface VIntlFormatters {
  * Uses vue-i18n's useI18n() under the hood.
  */
 export function useVIntl(): VIntlFormatters & { locale: Ref<string> } {
-	const { t, locale } = useI18n()
+	const { t, locale } = getSafeI18n()
 
 	function formatMessage(descriptor: MessageDescriptor, values?: Record<string, unknown>): string {
 		const key = descriptor.id