Extract reusable drasi-react components from the Trading example

[Copilot]

The Trading example's QueryTable and the shared SSE muxer were entangled with app-specific logic. This extracts them into a distinct, reusable, documented drasi-react package and rewires the app to consume it as an independent dependency, with no change to runtime behavior.

New package: examples/trading/drasi-react/ (@drasi/react)

Application-agnostic React library — all queries, reaction config, and routing are injected by the host:

• DrasiSSEClient — single shared EventSource multiplexing every query; trading content-routing replaced by an optional routeUnidentified(rows, deliver) callback.
• DrasiClient — query/reaction lifecycle, REST seeding, connection management via constructor options.
• DrasiProvider + hooks: useDrasiQuery (generic accumulation via getKey/transform/postProcess), useDrasiConnectionStatus, useDrasiServerUiUrl, useDrasiQueryDefinition.
• QueryTable — sortable/animated/full-screen table with code viewer; app Tailwind tokens replaced with neutral values, fully themeable via className props.
• Ships index.ts, styles.css, package.json, tsconfig.json, .gitignore, and a full README.md (API + build instructions). Builds independently (npm install && npm run build).

App integration (examples/trading/app/)

• Domain logic relocated to src/drasi/config.ts (query list, SSE reaction, content router) and src/drasi/queryOptions.ts (per-query key/transform/sort), replicating prior behavior exactly.
• Consumed as source via Vite alias + tsconfig path + Tailwind glob; React/clsx deduped to the app's single copy, so the demo needs no separate build step.
• main.tsx wraps the tree in <DrasiProvider>; all consumers import from @drasi/react.
• Removed the now-duplicated/dead files (services/DrasiClient.ts, hooks/useDrasi.ts, services/grpc/*, components/QueryTable.tsx, hooks/useRowAnimation.ts, shared/CodeViewerDialog.tsx), which also clears a latent tsc break (createdReaction unused).

Docs

• README.md / CONTRIBUTING.md updated for the new layout and shared components; stale file references corrected.

// main.tsx — app supplies all domain config; components stay generic
<DrasiProvider
  serverUrl="http://localhost:8280"
  queries={TRADING_QUERIES}
  reaction={TRADING_REACTION}
  routeUnidentified={routeTradingData}
>
  <App />
</DrasiProvider>

// A table is now just a binding + render description
<QueryTable
  queryId="watchlist-query"
  queryOptions={tradingQueryOptions('watchlist-query')}
  rowKey={(r) => r.symbol}
  columns={columns}
  animateOnChange="price"
/>

Note: the live end-to-end demo (Docker/Postgres/Drasi Server) was not run in this environment; verification was limited to tsc/vite build and dev-server module resolution.