Feat/sdk vue adapter

[Aboyeji-Isaac]

Closes #173

• Extracts framework-agnostic wallet logic into sdk/src/core/InvisibleWalletCore.ts
• Adds sdk/vue/ — @veil/invisible-wallet-vue package with useInvisibleWallet Vue 3 composable
• Adds runnable Vite + Vue 3 example app at sdk/src/examples/vue/ (register, login, deploy, send)
• sdk/vue/dist/ is gitignored — build output is not committed

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[Miracle656]

Thanks for the Vue adapter — a framework-agnostic adapter is genuinely wanted, and the sdk/vue/ package + example app look well-structured.

The blocker is sdk/src/core/InvisibleWalletCore.ts — this PR introduces an 882-line parallel reimplementation of the wallet core, including the WebAuthn signAuthEntry / sigVec assembly that feeds the contract's __check_auth. That signing path has six non-obvious correctness requirements (custom-account host-fn invocation, low-S normalization, signature expiration, footprint via re-simulation, sequence handling, and exact sigVec length), and a second implementation that can silently drift from the canonical one in useInvisibleWallet.ts is a real security/maintenance risk.

Could you restructure so the Vue adapter consumes the existing core logic rather than duplicating it? If a framework-agnostic core extraction is the goal, that's a worthwhile change but it should be its own focused PR (factoring useInvisibleWallet into a shared core that both React and Vue import — not a fork of it), so the signing path stays single-sourced and can get a dedicated security review. Happy to review that core-extraction PR separately. Moving this one to changes-requested in the meantime.