[Feature] Add intercepts target capability support

[henryStelle]

Why

UI extension target configurations did not recognize intercepts, so the capability could be removed while parsing extension configuration. The UI extensions server kit also omitted target capabilities from its extension point type.

What

• Adds an intercepts target capability schema with a string event, boolean blocking, and optional string-array applies_to.
• Preserves the existing allow_direct_linking target capability validation.
• Exposes opaque target capabilities on the server kit's ExtensionPoint, separately from extension-level capabilities.
• Adds parsing, transformation, and schema validation coverage.

Testing

• pnpm vitest run packages/app/src/cli/models/extensions/schemas.test.ts packages/app/src/cli/models/extensions/specifications/ui_extension.test.ts
• pnpm nx lint app
• pnpm nx type-check app
• pnpm --filter @shopify/ui-extensions-server-kit vitest run
• pnpm nx lint ui-extensions-server-kit
• pnpm nx build ui-extensions-server-kit
• pnpm exec prettier --check packages/app/src/cli/models/extensions/schemas.ts packages/app/src/cli/models/extensions/schemas.test.ts packages/app/src/cli/models/extensions/specifications/ui_extension.test.ts
• git diff --check

[Copilot]

Pull request overview

Adds support for the intercepts target capability in UI extension configuration parsing, and surfaces target-level capabilities through the UI extensions server kit types so the data survives parse/transform and can be consumed downstream.

Changes:

• Extends the CLI config schema to accept an optional intercepts field under target capabilities.
• Updates the server kit ExtensionPoint type to expose target-level capabilities as opaque JSON (Record<string, unknown>).
• Adds/updates tests to verify nested intercepts payloads are retained through parsing and transformation, and includes changeset entries for the impacted packages.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 1 comment.

File	Description
packages/ui-extensions-server-kit/src/types.ts	Adds optional capabilities to ExtensionPoint to expose target-level capabilities as opaque JSON.
packages/app/src/cli/models/extensions/specifications/ui_extension.test.ts	Adds coverage asserting nested intercepts configuration is preserved through parsing/transform.
packages/app/src/cli/models/extensions/schemas.ts	Updates target capabilities schema to accept intercepts.
.changeset/add-intercepts-capability.md	Declares minor bumps for @shopify/app and @shopify/ui-extensions-server-kit for the new capability support.

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[vctrchu]

Looks good thanks!

[vividviolet]

Why is this unknown - can we get the right types?

[henryStelle]

yes we can. to keep the types in sync I updated the tsconfg to pull the declared types from @shopify/ui-extensions-server-kit but didn't declare it a devDependancy of the app package as there was president and the types were not being re-exported. However, I recognize this might be considered not worth it or maybe it should be a formal dependancy?