Core localization

[mzaintariq]

Describe your changes

Added localization support to core example:

• locale selector in header
• pdp details + currency according to selected locale/lang
• currency support in cart + checkout
• empty cart on switching locale/lang
• updated links / redirects to support locale/lang

Issue ticket number and link

Checklist before requesting a review

• I have performed a self-review of my code
• If it is a core feature, I have added thorough tests.
• I've added a Changeset for my changes - Click here to learn what changesets are, and how to add one

[changeset-bot]

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Latest commit: 06e3e5f

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

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Project	Deployment	Preview	Comments	Updated (UTC)
commerce-essentials	Error			Dec 5, 2025 10:01am
composable-frontend-core	Ready	Preview	Comment	Dec 5, 2025 10:01am
composable-frontend-simple	Error			Dec 5, 2025 10:01am

2 Skipped Deployments

Project	Deployment	Preview	Comments	Updated (UTC)
composable-frontend-algolia	Ignored			Dec 5, 2025 10:01am
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