Add relative path prefix support to routeFor utilities

[Alex-Tideman]

Summary

• Adds a routePrefix mechanism via CoreProvider that allows consuming projects (e.g., Temporal Cloud) to inject a path prefix into all UI route functions
• Introduces a withPrefix helper that inserts the prefix between the SvelteKit base path and the route path across the 12 root resolve() calls — leaf functions inherit the prefix automatically through existing string concatenation
• Auth routes (routeForAuthentication, routeForLoginPage) are explicitly excluded to avoid breaking SSO flows
• Moves getRoutePrefix to CoreProvider so the prefix is available globally and configured at initialization

Changes

• core-provider.ts: Added getRoutePrefix to the CoreProvider type and InitOptions, with a default no-op returning ''
• route-for.ts: Added withPrefix() helper wrapping all root route functions; auth routes left unwrapped
• hooks.client.ts: OSS init passes getRoutePrefix: () => '' to maintain current behavior
• route-for.test.ts: Added test suite verifying prefix propagation through root, namespace, workflow, nexus, and schedule routes, plus exclusion from auth routes
• route-for-base-path.test.ts: Added comprehensive parameterized tests covering all routeFor functions with prefix enabled, ensuring base + prefix appears exactly once and auth routes remain prefix-free

Test plan

• pnpm test -- --run passes all new and existing route-for tests
• Verify OSS app behavior is unchanged (prefix defaults to empty string)
• Verify consuming project can set a prefix and all navigation routes include it
• Verify auth/login routes do not include the prefix

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Project	Deployment	Actions	Updated (UTC)
holocene	Ready	Preview, Comment	Apr 10, 2026 5:13pm