feat: SSE client + hello page + CSS palette + component test (#22, #23)#59
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#22, #23) Bundles two tickets that share the same frontend touch surface: #22 — typed SSE client primitive (frontend/src/lib/api/client.ts) - Port frontend/src/lib/api/client.js from Teller, rewritten as TS: generic over the parsed event shape (`SseEvent` interface), POST + body + AbortSignal supported, CRLF normalisation, malformed-chunk recovery (warns, doesn't throw). - Add typed SseError with optional status; createSession() and sendMessage<TEvent>(...) exports. - SseError uses an explicit field declaration instead of a parameter property — tsconfig's `erasableSyntaxOnly: true` rejects the latter. #23 — hello page + CSS palette + sample component test - Replace the Vite welcome screen with a real App.tsx that fetches /api/v1/health and renders `loading | ok | error` states with semantic ARIA roles + data-testids. - Port the Teller CSS-variable palette to frontend/src/styles/palette.css (light + dark via [data-theme='dark']); index.css imports it; App.css consumes the tokens (no raw hex). - Drop the Vite welcome assets (react.svg, vite.svg, hero.png, public/icons.svg). - frontend/src/App.test.tsx (Vitest + jsdom + Testing Library): mock fetch for the happy path (renders the ok badge with version) and the 500 path (renders the error message). Both PRs in one commit since the App page consumes the styles and lib shape; landing them separately would mean a half-shipped page in between. Closes #22 Closes #23 Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
This was referenced Apr 27, 2026
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Closes #22 + #23. Typed POST+ReadableStream SSE client primitive, hello page with /api/v1/health probe, CSS-variable palette (light + dark), 2-test Vitest suite.