CRAFT-2029- Migrate from react-intl to compile-time message parsing

[valoriecarli]

This PR migrates Nimbus from runtime react-intl to compile-time message parsing using @internationalized/string.

Before: Components used react-intl's useIntl() hook at runtime to format messages:

import { useIntl } from "react-intl";
import { messages } from "./alert.i18n";

const intl = useIntl();
const label = intl.formatMessage(messages.dismiss);

After: Components use useLocalizedStringFormatter() hook with pre-compiled message dictionaries

import { useLocalizedStringFormatter } from "@/hooks";
import { alertMessagesStrings } from "./alert.messages";

const msg = useLocalizedStringFormatter(alertMessagesStrings);
const label = msg.format("dismiss");

Key Changes:

1.) New build pipeline, 3-step compilation process (packages/i18n/scripts/)

• split-by-component: Transforms Tx format → ICU format, groups by component
• compile-component-messages: Compiles ICU messages → TS fns using @internationalized/string-compiler
• generate-dictionaries: Generates *.messages.ts dictionary files for components

2. New Hook (packages/nimbus/src/hooks/use-localized-string-formatter)
   Replaces useIntl() from react-intl

• Uses LocalizedStringDictionary from @internationalized/string
• Automatically handles locale normalization (e.g., de-DE → de)

3.) All components migrated over
4.) Storybook updated
5.) Documentation updated

[changeset-bot]

🦋 Changeset detected

Latest commit: 289b7d5

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 3 packages

Name	Type
@commercetools/nimbus	Major
@commercetools/nimbus-tokens	Major
@commercetools/nimbus-icons	Major

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Project	Deployment	Review	Updated (UTC)
nimbus-documentation	Ready	Preview, Comment	Jan 16, 2026 3:51pm
nimbus-storybook	Ready	Preview, Comment	Jan 16, 2026 3:51pm