Wire vitest 4 + jsdom + @testing-library/{react,jest-dom,user-event}
+ @vitest/coverage-v8 through vite.config.ts (defineConfig from
vitest/config). src/test/setup.ts registers jest-dom matchers and
RTL cleanup. tsconfig.app.json picks up vitest/globals types.
Seed suite Orchestrator.test.tsx covers the three regressions
called out in DEBT-043: empty-state render, kind-filter toggling
triggers a scoped refetch, mocked stream callback prepends a row.
Adds asciinema-player dependency, SessionDrawer.tsx that pages the
transcripts API (500 events per request) and rebuilds a v2 .cast blob
for playback, and a Session Transcripts section in AttackerDetail that
deep-links into the drawer. Truncation banner surfaces the 10 MB
per-session cap when it's been hit.
