chore: scaffold apps/basic from with-lingui

Made-with: Cursor

apps/basic/.github/instructions/testing.instructions.md

@@ -0,0 +1,30 @@
+---
+
+## applyTo: "tests/**/\*.ts,tests/**/_.tsx,src/mocks/\*\*/_.ts,playwright.config.ts"
+
+description: "Use when adding or editing tests, Playwright cases, MSW handlers, mock data, or test configuration. Keywords: test, e2e, playwright, mock, msw, coverage."
+
+# Testing Instructions
+
+## Purpose
+
+Keep tests fast, deterministic, and aligned with core business flows.
+
+## Do
+
+- Prioritize core flows first (auth, users CRUD, permission gates).
+- Keep assertions user-visible and behavior-focused.
+- Reuse existing helper patterns in tests before adding new helpers.
+- Keep mock handlers and mock data synchronized with API schemas.
+- Prefer focused test runs over full-suite runs during iteration.
+
+## Do Not
+
+- Do not add brittle selectors tied to unstable DOM internals.
+- Do not expand fixture data without a clear scenario need.
+- Do not duplicate scenarios already covered by existing tests.
+
+## Validation
+
+- Run focused tests first, then broader checks if needed.
+- Run: `vp check --no-fmt`