Fix HTTP client database path encoding

[rileytomasek]

Fixes a bug where the HTTP client fails against databases/branches whose names contain / (such as preview/pr-662 or dev/riley) because the database identifier is interpolated directly into /db/${database}/... URLs without encoding, causing the server to interpret / as path separators and return 404.

Changes

• In packages/gel/src/utils.ts#getAuthenticatedFetch, percent-encode the database/branch identifier before constructing the /db/... URL:
  • Build baseUrl from protocol and address as before.
  • Compute encodedDatabase = encodeURIComponent(database).
  • Build databaseUrl using encodedDatabase for the /db/${encodedDatabase}/... path segment.
• Add a regression test to packages/gel/test/client.test.ts (under the existing binary-over-http feature gate) that:
  • Stubs globalThis.fetch.
  • Calls getAuthenticatedFetch with database: "preview/pr-662" and valid connection options.
  • Invokes the returned authenticatedFetch.
  • Asserts that the request URL pathname is /db/preview%2Fpr-662/.
  • Restores the original globalThis.fetch.

Rationale

• Aligns the HTTP client behavior with the CLI/binary clients, which support any valid branch/database name including those containing /.
• Prevents subtle 404s when applications use per-branch names like dev/<user> or preview/pr-<number> with the HTTP client.
• Does not change the public API surface; only fixes URL construction.

Testing

Locally (against the rileytomasek/gel-js fork):

• yarn install --frozen-lockfile
• yarn turbo run typecheck --filter=gel (pass)
• yarn turbo run lint --filter=gel (pass)
• yarn turbo run test --filter=gel
  • Fails in this environment at Jest globalSetup because the Gel/EdgeDB server binary (GEL_SERVER_BIN / edgedb-server) is not available.
  • In CI or a dev environment where the Gel server binary is configured, the updated test suite should run and cover the new regression test.

Fixes #1320.

[gel-data-cla]

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