chore(sdk): enable strict TypeScript and export all public types

[Aboyeji-Isaac]

Summary

• Extracts framework-agnostic wallet logic into sdk/src/core/InvisibleWalletCore.ts so both React and Vue adapters share the same core
• Adds sdk/vue/ — a new @veil/invisible-wallet-vue package exporting useInvisibleWallet as a Vue 3 Composition API composable (reactive refs, onMounted/onUnmounted lifecycle, readonly state)
• Adds a complete runnable Vite + Vue 3 example app at sdk/src/examples/vue/ demonstrating register, login, deploy, and send
• Replaces invented option types (RegisterOptions, SignOptions, SendOptions) with a derived WalletState type that cannot drift from the hook
• Excludes src/examples from the SDK tsconfig so tsc --noEmit passes cleanly under strict: true

Acceptance criteria — #173

• Composable parity with the React hook (register, login, sign, send, and more)
• Reactive state (address, isDeployed, isPending, error) via readonly refs
• Vue example app works in examples/vue/ — includes App.vue, main.ts, tsconfig.json, and .env.example
• Bundle imports only vue and @stellar/stellar-sdk — no React dependency

Acceptance criteria — #179

• tsc --noEmit passes under strict: true
• No any in public API
• WalletState importable via import type { WalletState } from '@veil/invisible-wallet-sdk'

Test plan

• cd sdk/vue && npm install && npm run build — bundle compiles without errors
• cd sdk/src/examples/vue && npm install && npm run dev — dev server starts on port 5173
• Register flow: clicking Register opens a WebAuthn prompt and populates the wallet address
• Login flow: clicking Login restores wallet from localStorage
• Deploy flow: entering a signer secret and clicking Deploy submits an on-chain transaction
• Send flow: filling in recipient, token, and amount and clicking Send submits an approve transaction

Closes #173
Closes #179

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[Miracle656]

Thanks for the PR! Before merging there are a few things to address — the current state would publish types that don't match the SDK's actual API.

1. sdk/tsconfig.json isn't actually modified by this PR

The PR body says "Enabled strict: true in sdk/tsconfig.json" but tsconfig.json isn't in the changed files. Checking main directly, strict: true is already set there (it was tightened during the React Native PR #211). So the strict-mode part of issue #179 is already done — no action needed on your side, just remove that claim from the PR description.

2. The 4 new types in sdk/src/types.ts don't match the real hook API

The hook in sdk/src/useInvisibleWallet.ts exposes these (register, signAuthEntry, deploy) as positional-argument functions, not options-object functions. So:

• RegisterOptions = { username?: string } — register(username?: string) takes a positional string, not an options object. Importing this type wouldn't help anyone call register().
• SignOptions = { signaturePayload: Uint8Array } — same story; signAuthEntry(payload) is positional.
• SendOptions = { signerSecret, publicKeyBytes } — there is no send function. The closest is deploy(signerSecret, publicKeyBytes), also positional. Inventing a name that doesn't exist in the SDK will confuse integrators.
• WalletState is closer to useful, but the hook returns these properties directly on the InvisibleWallet object ({ address, isDeployed, isPending, error, register, deploy, ... }), not as a separate WalletState aggregate.

Because none of these types are referenced inside the SDK, tsc --noEmit of course passes — they're decorative.

3. The actual fix is much simpler

useInvisibleWallet.ts already exports the real public types. Re-exporting these gives integrators exactly what they need:

// sdk/src/index.ts
export type {
  WalletConfig,
  WalletState,           // see below — derive from InvisibleWallet
  StorageAdapter,
  RegisterResult,
  DeployResult,
  AddSignerResult,
  SignerInfo,
  InitiateRecoveryResult,
  WebAuthnSignature,
} from './useInvisibleWallet';

For WalletState specifically, since the hook returns these on its result object, the cleanest export is a Pick<> of the existing InvisibleWallet type:

import type { useInvisibleWallet } from './useInvisibleWallet';

export type WalletState = Pick<
  ReturnType<typeof useInvisibleWallet>,
  'address' | 'isDeployed' | 'isPending' | 'error'
>;

That way WalletState cannot drift from the hook — it's derived.

Suggested revision

1. Delete the invented RegisterOptions, SignOptions, SendOptions from types.ts (or remove the file entirely)
2. In sdk/src/index.ts, re-export the real types as shown above
3. Add WalletState as a derived Pick<> of the hook's return type
4. Remove the "Enabled strict: true" line from the PR description (it's already on)
5. Verify npm pack --dry-run shows the new type re-exports in dist/index.d.ts

Once that's done, this will fully close #179.