test: cover template page hydration

[taherdhanera]

/claim #71

Fixes #71.

Summary

• Add focused Vitest coverage for the interface template page entrypoint.
• Cover the no-root guard so the module does not hydrate when #root[data-client="template"] is absent.
• Cover the positive hydration path and assert hydrateRoot receives the server root.
• Add a non-overlapping interface primitive coverage slice for Avatar fallback/image states, Card anchor/div variants, Label required validation messaging, Loader sizing, Toggle size/selected classes, and Input prefix/suffix, invalid state, sizing, and custom class handling.
• Add public package entrypoint coverage for the root runtime API (StarbaseDB, StarbaseDBDurableObject) and documented plugin barrel exports.

Validation

• pnpm exec vitest --run src/public-entrypoints.test.ts plugins/interface/pages/template/index.test.tsx plugins/interface/components/primitives.test.tsx -> 10 tests passed
• pnpm exec prettier --check src/public-entrypoints.test.ts plugins/interface/pages/template/index.test.tsx plugins/interface/components/primitives.test.tsx -> passed
• git diff --check -> passed

Note: I also ran the current full coverage command, pnpm exec vitest --run --coverage.enabled true --coverage.reporter=text; the baseline currently fails in existing src/rls/index.test.ts assertions before this change. This PR's focused tests pass locally.

[taherdhanera]

Pushed follow-up commit ede6342 with a second non-overlapping interface coverage slice.

Additional coverage now includes Avatar fallback/image states, Card anchor/div variants, Label required validation messaging, Loader sizing/classes, and Toggle size/selected classes. This stays separate from the existing Button/Select and InterfacePlugin route-registration coverage work.

Focused validation passes:

• pnpm exec vitest --run plugins/interface/pages/template/index.test.tsx plugins/interface/components/primitives.test.tsx -> 2 files passed, 7 tests passed
• pnpm exec prettier --check plugins/interface/pages/template/index.test.tsx plugins/interface/components/primitives.test.tsx
• git diff --check

[taherdhanera]

Pushed one more focused coverage commit (a85df98) adding Input primitive assertions for prefix/suffix rendering, invalid state styling, sizing, and custom classes.

Verification rerun:

• pnpm exec vitest --run plugins/interface/pages/template/index.test.tsx plugins/interface/components/primitives.test.tsx -> 8 tests passed
• pnpm exec prettier --check plugins/interface/pages/template/index.test.tsx plugins/interface/components/primitives.test.tsx -> passed
• git diff --check -> passed

[taherdhanera]

Pushed another focused coverage commit (8496c2f) adding public package entrypoint tests:

• root runtime API exports: StarbaseDB, StarbaseDBDurableObject
• plugin barrel exports: Studio, WebSocket, SQL macros, Stripe, CDC, Query Log, Resend, and Clerk plugins

Verification rerun:

• pnpm exec vitest --run src/public-entrypoints.test.ts plugins/interface/pages/template/index.test.tsx plugins/interface/components/primitives.test.tsx -> 10 tests passed
• pnpm exec prettier --check src/public-entrypoints.test.ts plugins/interface/pages/template/index.test.tsx plugins/interface/components/primitives.test.tsx -> passed
• git diff --check -> passed