Add pending wallet selection flow

[tolgahan-arikan]

Summary

• add session-bound PendingWalletSelection manual auth flow for email and OIDC redirect auth; the result carries walletType, filtered wallets, credential, selectWallet, and createAndSelectWallet
• bind pending wallet selection to the signer/auth session and guard stale, reused, and concurrent selection actions before wallet API requests
• make pending selection behavior match the requested wallet type: filter wallets locally, validate selected wallet membership before UseWallet, and create wallets with the auth-requested type
• require public wallet.useWallet and wallet.createWallet to start from an active wallet session; manual auth must complete through PendingWalletSelection
• expose wallet.getIdToken as the public wrapper around generated GetIDToken, with docs, type tests, unit coverage, and a React example entry under Other operations
• harden email auth completion so the same attempt is single-flight/idempotent, stale attempts cannot activate or persist pending state, retryable failures can retry, and consumed commitments clear the active attempt
• tighten SDK internals with typed wallet/indexer operation labels and remove unneeded root exports: defaultGoogleClientId, defaultRelayRedirectUri, SigningAlgorithm, and OmsSdkErrorParams
• update API docs, README, type tests, wallet/OIDC/error coverage, and the React example manual-selection UI/layout

Verification

• pnpm exec vitest run tests/walletSession.test.ts tests/walletErrors.test.ts tests/indexerClient.test.ts
• pnpm exec vitest run tests/walletSigning.test.ts
• pnpm test:types
• pnpm exec tsc --noEmit
• pnpm test
• pnpm build
• pnpm build:example
• pnpm build:node-example
• git diff --check
• React example dev server verified at http://127.0.0.1:5173/

[chatgpt-codex-connector]

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