fix(mobile): align Live Activity target name for EAS signing

[AprilNEA]

Summary

• make the Live Activity Xcode target name match the EAS signing target exactly
• preserve the user-facing LinkCode Agent Activity display name
• keep the Live Activity target and signing configuration intact

Root cause

@bacons/apple-targets sanitized LinkCode Agent Activity to the EAS target name LinkCodeAgentActivity, while Expo provisioning looked up PBXNativeTarget.name by exact equality. The generated Xcode target retained spaces, so the production iOS build failed during Configure Xcode project.

Impact

Production EAS builds can assign the existing widget provisioning profile to the generated Live Activity target.

Validation

• clean iOS Expo prebuild
• Expo config introspection confirms EAS targetName: LinkCodeAgentActivity
• Expo's exact findNativeTargetByName lookup succeeds against the generated project
• pnpm check:ci
• pnpm test — 2,439 passed, 1 skipped
• pnpm -F @linkcode/mobile smoke:export — Android and iOS passed

Linear: CODE-534

[linear-code]

CODE-534