diff --git a/package-lock.json b/package-lock.json
index 78b44785c..c73d08aa5 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,21 +1,18 @@
 {
 	"name": "openscreen",
-	"version": "1.6.0",
+	"version": "1.8.0-rc.3",
 	"lockfileVersion": 3,
 	"requires": true,
 	"packages": {
 		"": {
 			"name": "openscreen",
-			"version": "1.6.0",
+			"version": "1.8.0-rc.3",
 			"dependencies": {
 				"@fix-webm-duration/fix": "^1.0.1",
 				"@langchain/anthropic": "^1.3.26",
 				"@langchain/core": "^1.1.44",
-				"@langchain/langgraph": "^1.2.7",
-				"@langchain/langgraph-checkpoint": "^1.0.2",
 				"@langchain/mistralai": "^1.0.8",
 				"@langchain/openai": "^1.4.2",
-				"@pixi/filter-drop-shadow": "^5.2.0",
 				"@radix-ui/react-accordion": "^1.2.12",
 				"@radix-ui/react-dialog": "^1.1.15",
 				"@radix-ui/react-dropdown-menu": "^2.1.16",
@@ -38,12 +35,9 @@
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 				"clsx": "^2.1.1",
 				"deepagents": "^1.10.5",
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-				"fix-webm-duration": "^1.0.6",
 				"gif.js": "^0.2.0",
-				"gsap": "^3.15.0",
+				"i18next": "^23.16.0",
 				"langchain": "^1.2.39",
-				"langsmith": "^0.7.1",
 				"lucide-react": "^0.545.0",
 				"mediabunny": "^1.40.1",
 				"motion": "^12.38.0",
@@ -58,7 +52,6 @@
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 				"tailwind-merge": "^3.5.0",
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 				"web-demuxer": "^4.0.0",
 				"zod": "^4.1.12",
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@@ -2363,132 +2356,12 @@
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-			"license": "MIT",
-			"peer": true,
-			"dependencies": {
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-			}
-		},
 		"node_modules/@pixi/colord": {
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 			"resolved": "https://registry.npmjs.org/@pixi/colord/-/colord-2.9.6.tgz",
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 			"license": "MIT"
 		},
-		"node_modules/@pixi/constants": {
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-			"resolved": "https://registry.npmjs.org/@pixi/constants/-/constants-7.4.3.tgz",
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-			"resolved": "https://registry.npmjs.org/@pixi/core/-/core-7.4.3.tgz",
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-				"url": "https://opencollective.com/pixijs"
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-			"resolved": "https://registry.npmjs.org/@pixi/ticker/-/ticker-7.4.3.tgz",
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-				"@pixi/settings": "7.4.3",
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-			"resolved": "https://registry.npmjs.org/@pixi/utils/-/utils-7.4.3.tgz",
-			"integrity": "sha512-NO3Y9HAn2UKS1YdxffqsPp+kDpVm8XWvkZcS/E+rBzY9VTLnNOI7cawSRm+dacdET3a8Jad3aDKEDZ0HmAqAFA==",
-			"license": "MIT",
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 		"node_modules/@playwright/test": {
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@@ -4576,13 +4449,6 @@
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-			"license": "MIT",
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 		"node_modules/@types/debug": {
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 			"license": "MIT"
 		},
-		"node_modules/@types/earcut": {
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-			"resolved": "https://registry.npmjs.org/@types/earcut/-/earcut-2.1.4.tgz",
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-			"license": "MIT",
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 		"node_modules/@types/estree": {
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 			"resolved": "https://registry.npmjs.org/@types/estree/-/estree-1.0.8.tgz",
@@ -5910,6 +5769,7 @@
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+			"dev": true,
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@@ -5919,23 +5779,6 @@
 				"node": ">= 0.4"
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-			"resolved": "https://registry.npmjs.org/call-bound/-/call-bound-1.0.4.tgz",
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-			"funding": {
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+			"dev": true,
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@@ -6725,13 +6569,6 @@
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-			"license": "ISC",
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@@ -6961,21 +6798,6 @@
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-		"node_modules/emoji-picker-react": {
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-			"resolved": "https://registry.npmjs.org/emoji-picker-react/-/emoji-picker-react-4.18.0.tgz",
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-			"peerDependencies": {
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+			"dev": true,
 			"license": "MIT",
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@@ -7396,18 +7220,6 @@
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@@ -7782,12 +7597,6 @@
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-			"license": "Standard 'no charge' license: https://gsap.com/standard-license."
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@@ -7963,6 +7773,29 @@
 				"url": "https://github.com/sponsors/typicode"
 			}
 		},
+		"node_modules/i18next": {
+			"version": "23.16.8",
+			"resolved": "https://registry.npmjs.org/i18next/-/i18next-23.16.8.tgz",
+			"integrity": "sha512-06r/TitrM88Mg5FdUXAKL96dJMzgqLE5dv3ryBAra4KCwD9mJ4ndOTS95ZuymIGoE+2hzfdaMak2X11/es7ZWg==",
+			"funding": [
+				{
+					"type": "individual",
+					"url": "https://locize.com"
+				},
+				{
+					"type": "individual",
+					"url": "https://locize.com/i18next.html"
+				},
+				{
+					"type": "individual",
+					"url": "https://www.i18next.com/how-to/faq#i18next-is-awesome.-how-can-i-support-the-project"
+				}
+			],
+			"license": "MIT",
+			"dependencies": {
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+			}
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@@ -9229,19 +9063,6 @@
 				"node": ">= 6"
 			}
 		},
-		"node_modules/object-inspect": {
-			"version": "1.13.4",
-			"resolved": "https://registry.npmjs.org/object-inspect/-/object-inspect-1.13.4.tgz",
-			"integrity": "sha512-W67iLl4J2EXEGTbfeHCffrjDfitvLANg0UlX3wFUUSTx92KXRFegMHUVgSqE+wvhAbi4WqjGg9czysTV2Epbew==",
-			"license": "MIT",
-			"peer": true,
-			"engines": {
-				"node": ">= 0.4"
-			},
-			"funding": {
-				"url": "https://github.com/sponsors/ljharb"
-			}
-		},
 		"node_modules/object-keys": {
 			"version": "1.1.1",
 			"resolved": "https://registry.npmjs.org/object-keys/-/object-keys-1.1.1.tgz",
@@ -10083,22 +9904,6 @@
 			],
 			"license": "MIT"
 		},
-		"node_modules/qs": {
-			"version": "6.15.1",
-			"resolved": "https://registry.npmjs.org/qs/-/qs-6.15.1.tgz",
-			"integrity": "sha512-6YHEFRL9mfgcAvql/XhwTvf5jKcOiiupt2FiJxHkiX1z4j7WL8J/jRHYLluORvc1XxB5rV20KoeK00gVJamspg==",
-			"license": "BSD-3-Clause",
-			"peer": true,
-			"dependencies": {
-				"side-channel": "^1.1.0"
-			},
-			"engines": {
-				"node": ">=0.6"
-			},
-			"funding": {
-				"url": "https://github.com/sponsors/ljharb"
-			}
-		},
 		"node_modules/queue-microtask": {
 			"version": "1.2.3",
 			"resolved": "https://registry.npmjs.org/queue-microtask/-/queue-microtask-1.2.3.tgz",
@@ -10719,82 +10524,6 @@
 				"node": ">=8"
 			}
 		},
-		"node_modules/side-channel": {
-			"version": "1.1.0",
-			"resolved": "https://registry.npmjs.org/side-channel/-/side-channel-1.1.0.tgz",
-			"integrity": "sha512-ZX99e6tRweoUXqR+VBrslhda51Nh5MTQwou5tnUDgbtyM0dBgmhEDtWGP/xbKn6hqfPRHujUNwz5fy/wbbhnpw==",
-			"license": "MIT",
-			"peer": true,
-			"dependencies": {
-				"es-errors": "^1.3.0",
-				"object-inspect": "^1.13.3",
-				"side-channel-list": "^1.0.0",
-				"side-channel-map": "^1.0.1",
-				"side-channel-weakmap": "^1.0.2"
-			},
-			"engines": {
-				"node": ">= 0.4"
-			},
-			"funding": {
-				"url": "https://github.com/sponsors/ljharb"
-			}
-		},
-		"node_modules/side-channel-list": {
-			"version": "1.0.1",
-			"resolved": "https://registry.npmjs.org/side-channel-list/-/side-channel-list-1.0.1.tgz",
-			"integrity": "sha512-mjn/0bi/oUURjc5Xl7IaWi/OJJJumuoJFQJfDDyO46+hBWsfaVM65TBHq2eoZBhzl9EchxOijpkbRC8SVBQU0w==",
-			"license": "MIT",
-			"peer": true,
-			"dependencies": {
-				"es-errors": "^1.3.0",
-				"object-inspect": "^1.13.4"
-			},
-			"engines": {
-				"node": ">= 0.4"
-			},
-			"funding": {
-				"url": "https://github.com/sponsors/ljharb"
-			}
-		},
-		"node_modules/side-channel-map": {
-			"version": "1.0.1",
-			"resolved": "https://registry.npmjs.org/side-channel-map/-/side-channel-map-1.0.1.tgz",
-			"integrity": "sha512-VCjCNfgMsby3tTdo02nbjtM/ewra6jPHmpThenkTYh8pG9ucZ/1P8So4u4FGBek/BjpOVsDCMoLA/iuBKIFXRA==",
-			"license": "MIT",
-			"peer": true,
-			"dependencies": {
-				"call-bound": "^1.0.2",
-				"es-errors": "^1.3.0",
-				"get-intrinsic": "^1.2.5",
-				"object-inspect": "^1.13.3"
-			},
-			"engines": {
-				"node": ">= 0.4"
-			},
-			"funding": {
-				"url": "https://github.com/sponsors/ljharb"
-			}
-		},
-		"node_modules/side-channel-weakmap": {
-			"version": "1.0.2",
-			"resolved": "https://registry.npmjs.org/side-channel-weakmap/-/side-channel-weakmap-1.0.2.tgz",
-			"integrity": "sha512-WPS/HvHQTYnHisLo9McqBHOJk2FkHO/tlpvldyrnem4aeQp4hai3gythswg6p01oSoTl58rcpiFAjF2br2Ak2A==",
-			"license": "MIT",
-			"peer": true,
-			"dependencies": {
-				"call-bound": "^1.0.2",
-				"es-errors": "^1.3.0",
-				"get-intrinsic": "^1.2.5",
-				"object-inspect": "^1.13.3",
-				"side-channel-map": "^1.0.1"
-			},
-			"engines": {
-				"node": ">= 0.4"
-			},
-			"funding": {
-				"url": "https://github.com/sponsors/ljharb"
-			}
-		},
 		"node_modules/siginfo": {
 			"version": "2.0.0",
 			"resolved": "https://registry.npmjs.org/siginfo/-/siginfo-2.0.0.tgz",
@@ -11620,27 +11349,6 @@
 				"punycode": "^2.1.0"
 			}
 		},
-		"node_modules/url": {
-			"version": "0.11.4",
-			"resolved": "https://registry.npmjs.org/url/-/url-0.11.4.tgz",
-			"integrity": "sha512-oCwdVC7mTuWiPyjLUz/COz5TLk6wgp0RCsN+wHZ2Ekneac9w8uuV0njcbbie2ME+Vs+d6duwmYuR3HgQXs1fOg==",
-			"license": "MIT",
-			"peer": true,
-			"dependencies": {
-				"punycode": "^1.4.1",
-				"qs": "^6.12.3"
-			},
-			"engines": {
-				"node": ">= 0.4"
-			}
-		},
-		"node_modules/url/node_modules/punycode": {
-			"version": "1.4.1",
-			"resolved": "https://registry.npmjs.org/punycode/-/punycode-1.4.1.tgz",
-			"integrity": "sha512-jmYNElW7yvO7TV33CjSmvSiE2yco3bV2czu/OzDKdMNVZQWfxCblURLhf+47syQRBntjfLdd/H0egrzIG+oaFQ==",
-			"license": "MIT",
-			"peer": true
-		},
 		"node_modules/use-callback-ref": {
 			"version": "1.3.3",
 			"resolved": "https://registry.npmjs.org/use-callback-ref/-/use-callback-ref-1.3.3.tgz",
@@ -11706,19 +11414,6 @@
 			"integrity": "sha512-EPD5q1uXyFxJpCrLnCc1nHnq3gOa6DZBocAIiI2TaSCA7VCJ1UJDMagCzIkXNsUYfD1daK//LTEQ8xiIbrHtcw==",
 			"license": "MIT"
 		},
-		"node_modules/uuid": {
-			"version": "13.0.0",
-			"resolved": "https://registry.npmjs.org/uuid/-/uuid-13.0.0.tgz",
-			"integrity": "sha512-XQegIaBTVUjSHliKqcnFqYypAd4S+WCYt5NIeRs6w/UAry7z8Y9j5ZwRRL4kzq9U3sD6v+85er9FvkEaBpji2w==",
-			"funding": [
-				"https://github.com/sponsors/broofa",
-				"https://github.com/sponsors/ctavan"
-			],
-			"license": "MIT",
-			"bin": {
-				"uuid": "dist-node/bin/uuid"
-			}
-		},
 		"node_modules/verror": {
 			"version": "1.10.1",
 			"resolved": "https://registry.npmjs.org/verror/-/verror-1.10.1.tgz",
diff --git a/package.json b/package.json
index b818ffc4c..46210df76 100644
--- a/package.json
+++ b/package.json
@@ -86,6 +86,7 @@
 		"clsx": "^2.1.1",
 		"deepagents": "^1.10.5",
 		"gif.js": "^0.2.0",
+		"i18next": "^23.16.0",
 		"langchain": "^1.2.39",
 		"lucide-react": "^0.545.0",
 		"mediabunny": "^1.40.1",
diff --git a/src/i18n/loader.ts b/src/i18n/loader.ts
index 36d8eb651..e5ebbb560 100644
--- a/src/i18n/loader.ts
+++ b/src/i18n/loader.ts
@@ -1,111 +1,72 @@
+import i18next, { type Resource } from "i18next";
 import { DEFAULT_LOCALE, I18N_NAMESPACES, type I18nNamespace, type Locale } from "./config";
 
-type MessageMap = Record<string, unknown>;
-type LocaleValidationError = {
-	locale: string;
-	missingNamespaces: I18nNamespace[];
-};
-
-const modules = import.meta.glob("./locales/**/*.json", { eager: true }) as Record<
-	string,
-	{ default: MessageMap }
->;
-
-const messages: Record<string, Record<string, MessageMap>> = {};
+const modules = import.meta.glob("./locales/**/*.json", {
+	eager: true,
+	import: "default",
+}) as Record<string, unknown>;
 
+const byLocale: Record<string, Record<string, unknown>> = {};
 for (const [path, mod] of Object.entries(modules)) {
-	// path looks like "./locales/en/common.json"
-	const parts = path.replace("./locales/", "").replace(".json", "").split("/");
-	const locale = parts[0];
-	const namespace = parts[1];
-	if (!messages[locale]) messages[locale] = {};
-	messages[locale][namespace] = mod.default;
+	const [locale, namespace] = path.replace("./locales/", "").replace(".json", "").split("/");
+	if (!byLocale[locale]) byLocale[locale] = {};
+	byLocale[locale][namespace] = mod;
 }
 
-const REQUIRED_NAMESPACES = new Set<string>(I18N_NAMESPACES);
-
-const localeValidationErrors: LocaleValidationError[] = Object.keys(messages)
-	.map((locale) => {
-		const localeMessages = messages[locale] ?? {};
-		const missingNamespaces = I18N_NAMESPACES.filter((namespace) => !localeMessages[namespace]);
-		return {
-			locale,
-			missingNamespaces,
-		};
-	})
-	.filter((entry) => entry.missingNamespaces.length > 0);
-
-const invalidLocales = new Set(localeValidationErrors.map((entry) => entry.locale));
-
-const availableLocales = Object.keys(messages)
-	.filter((locale) => REQUIRED_NAMESPACES.size > 0 && hasRequiredNamespaces(messages[locale]))
-	.filter((locale) => !invalidLocales.has(locale))
-	.sort((a, b) => {
-		if (a === DEFAULT_LOCALE) return -1;
-		if (b === DEFAULT_LOCALE) return 1;
-		return a.localeCompare(b);
-	});
+const isComplete = (locale: string) => I18N_NAMESPACES.every((ns) => byLocale[locale]?.[ns]);
 
-if (localeValidationErrors.length > 0) {
-	console.error("[i18n] Incomplete locale folders were excluded:");
-	for (const entry of localeValidationErrors) {
-		console.error(
-			`[i18n] ${entry.locale}: missing ${entry.missingNamespaces.map((ns) => `${ns}.json`).join(", ")}`,
-		);
-	}
+const incomplete = Object.keys(byLocale).filter((locale) => !isComplete(locale));
+if (incomplete.length > 0) {
+	console.error("[i18n] Incomplete locale folders were excluded:", incomplete.join(", "));
 }
 
-function hasRequiredNamespaces(localeMessages: Record<string, MessageMap> | undefined): boolean {
-	if (!localeMessages) return false;
-	for (const namespace of REQUIRED_NAMESPACES) {
-		if (!localeMessages[namespace]) return false;
-	}
-	return true;
-}
-
-function isAvailableLocale(locale: string): locale is Locale {
-	return availableLocales.includes(locale);
+const availableLocales = Object.keys(byLocale)
+	.filter(isComplete)
+	.sort((a, b) => (a === DEFAULT_LOCALE ? -1 : b === DEFAULT_LOCALE ? 1 : a.localeCompare(b)));
+
+const resources = Object.fromEntries(
+	availableLocales.map((locale) => [locale, byLocale[locale] as Resource[string]]),
+) as Resource;
+
+// `lng` is inert here: every lookup below passes an explicit `lng`, so the init
+// language never reaches the output. Reading localStorage at module scope would
+// add a failure mode for no gain — it can throw SecurityError, and at module
+// scope that takes down the whole graph rather than one component. The user's
+// stored preference is applied by I18nContext, which guards its access.
+await i18next.init({
+	lng: DEFAULT_LOCALE,
+	fallbackLng: DEFAULT_LOCALE,
+	defaultNS: "common",
+	resources,
+	interpolation: { escapeValue: false },
+	// A non-leaf key would otherwise render i18next's English developer message
+	// ("key 'x' returned an object instead of string") straight into the UI.
+	// Returning undefined keeps the old loader's behaviour: fall through to the
+	// `namespace.key` marker.
+	returnedObjectHandler: () => undefined,
+});
+
+function tAt(
+	lng: Locale,
+	ns: I18nNamespace,
+	key: string,
+	vars?: Record<string, string | number>,
+): string | undefined {
+	if (!i18next.exists(key, { lng, ns })) return undefined;
+	const result = i18next.t(key, { lng, ns, ...vars });
+	return typeof result === "string" ? result : undefined;
 }
 
 export function getAvailableLocales(): Locale[] {
-	if (availableLocales.length === 0) {
-		return [DEFAULT_LOCALE];
-	}
-	return availableLocales;
-}
-
-export function getLocaleValidationErrors(): LocaleValidationError[] {
-	return localeValidationErrors;
-}
-
-function getMessageValue(obj: unknown, dotPath: string): string | undefined {
-	const keys = dotPath.split(".");
-	let current: unknown = obj;
-	for (const key of keys) {
-		if (current == null || typeof current !== "object") return undefined;
-		current = (current as Record<string, unknown>)[key];
-	}
-	return typeof current === "string" ? current : undefined;
-}
-
-function interpolate(str: string, vars?: Record<string, string | number>): string {
-	if (!vars) return str;
-	return str.replace(/\{\{(\w+)\}\}/g, (_, key: string) => String(vars[key] ?? `{{${key}}}`));
-}
-
-export function getMessages(locale: Locale, namespace: I18nNamespace): MessageMap {
-	const resolvedLocale = isAvailableLocale(locale) ? locale : DEFAULT_LOCALE;
-	return messages[resolvedLocale]?.[namespace] ?? {};
+	return availableLocales.length > 0 ? availableLocales : [DEFAULT_LOCALE];
 }
 
 export function getLocaleName(locale: Locale): string {
-	const resolvedLocale = isAvailableLocale(locale) ? locale : DEFAULT_LOCALE;
-	return getMessageValue(messages[resolvedLocale]?.common, "locale.name") ?? locale;
+	return tAt(locale, "common", "locale.name") ?? locale;
 }
 
 export function getLocaleShort(locale: Locale): string {
-	const resolvedLocale = isAvailableLocale(locale) ? locale : DEFAULT_LOCALE;
-	return getMessageValue(messages[resolvedLocale]?.common, "locale.short") ?? locale;
+	return tAt(locale, "common", "locale.short") ?? locale;
 }
 
 export function translate(
@@ -114,12 +75,5 @@ export function translate(
 	key: string,
 	vars?: Record<string, string | number>,
 ): string {
-	const value =
-		getMessageValue(
-			messages[isAvailableLocale(locale) ? locale : DEFAULT_LOCALE]?.[namespace],
-			key,
-		) ?? getMessageValue(messages[DEFAULT_LOCALE]?.[namespace], key);
-
-	if (value == null) return `${namespace}.${key}`;
-	return interpolate(value, vars);
+	return tAt(locale, namespace, key, vars) ?? `${namespace}.${key}`;
 }