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Donkie d9fd44eab9 Add Playwright frontend integration tests; fix broken SPA static serving
Add a browser-driven integration suite (tests_frontend/) that runs against
the real production image + PostgreSQL and drives the UI with Playwright:
a smoke test that navigates every page via the sidebar with no console
errors, and a CRUD test that creates a vendor -> filament -> spool entirely
through the UI. Wired up as `poe itest-frontend` and a new `test-frontend`
CI job (reusing the image built for the backend tests, gating releases).

Navigation goes through real UI buttons (language-independent link targets)
and the app language is forced to English so label matchers are stable
regardless of the runner's browser locale.

This immediately caught a real regression: Starlette 1.3.1 (pulled by a
recent dep bump) removed the `method` kwarg from FileResponse, so
SinglePageApplication 500'd on every static asset and the whole UI was dead.
Drop the removed kwarg — Starlette now derives HEAD handling from the scope.

Claude-Session: https://claude.ai/code/session_01BQjJiwEbu6bHbeDjPPDm3V
2026-07-07 09:12:42 +02:00
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