Long-poll the desktop OAuth await endpoint

[RhysSullivan]

Desktop OAuth connects in the system browser waited on a fixed 1s poll of GET /api/oauth/await/:sessionId. The completed result was already in the in-memory store the moment the provider redirect landed, so the spinner sat on a ready answer for ~500ms average, up to 1s.

Before: the server answered each poll synchronously from the store; the client sampled on a 1s setInterval.
After: the server holds the await request open (25s per hold) and resolves it the instant the completion listener publishes for that session; deadline or client disconnect answers null (still pending). The client now runs one request at a time and reconnects 1s after each settles, so held requests never stack. Single-consumer semantics are unchanged, and waiters that time out or disconnect are removed.

Mixed versions work in both directions: an old client gets its answer within one poll of a new server; a new client against an old server behaves exactly as today.

Testing

• New unit tests for the store long-poll: resolve-on-publish mid-wait, deadline returns pending, waiter cleanup on abort and timeout, one publish reaches exactly one of several waiters.
• New HTTP tests in serve.test.ts: held request answers on publish, pre-published result answers immediately, disconnect drops the waiter without consuming a later result.
• New client tests: no overlapping requests against a holding server, reconnect after a pending answer, teardown aborts the in-flight request.
• bun run test in apps/local (94 passed) and packages/react (425 passed); repo typecheck, lint, format:check all green.

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