fix: TypeScript build errors in metamask/leap-metamask/mock wallets and vue

[pyramation]

Summary

Package build scripts run tsc ... || true, so these packages have been shipping with type errors that never fail pnpm run build/CI. After this PR, the full pnpm run build log has 0 error TS lines (was ~60 across 4 packages). Root causes: imports from @interchainjs/cosmos/types/wallet (that path no longer exists in 1.21.0), and code still written against the old BaseWallet/WalletManager API.

Wallets

• cosmos-extension-metamask: addSuggestChain(chainId) used an undefined chain, so it threw at runtime. It now does const chain = this.getChainById(chainId) and uses getAssetListByChainId(chainId) (before: assetLists[0], which could be the wrong chain). Imports now come from @interchainjs/cosmos and @interchainjs/amino (added as a dep, same version as core).
• leap-cosmos-extension-metamask: addSuggestChain(chainId: string) now matches the base signature. init() no longer catches its own error and writes it to a nonexistent errorMessage; it throws, so the store marks the wallet NotExist when MetaMask is missing, the same way the other extensions behave.
• mock-wallet: brought in line with BaseWallet (connect(chainId: string), addSuggestChain(chainId), getProvider, narrowed the algo type). MockEthereumWallet.getProvider() now returns the current chain's JsonRpcProvider (it used to read an undeclared this.provider). Dropped the unused @keplr-wallet/types dep.

Vue (@interchain-kit/vue): it was still written against the old core WalletManager (getCurrentWallet(), wallet.walletState, one-arg connect(walletName)), none of which exist anymore. Ported it to WalletManagerStore, the same store React uses:

// ChainProvider.vue
const walletManager = shallowRef(new WalletManagerStore(chains, assetLists, wallets, signerOptions, endpointOptions))
walletManager.value.subscribe(() => triggerRef(walletManager))
provide(WALLET_MANAGER_KEY, walletManager)

// composables read state from the store
useAccount(chain, wallet) => computed(() => wm.value.getChainWalletState(wallet, chain)?.account)
connect/disconnect       => wm.value.connect(walletName, chainName)

• Public API changes (pre-launch, so no compatibility aliases): useWalletManager() now returns ShallowRef<WalletManagerStore>. useConfig() now exposes addChains(...) in place of the update* setters, which only reassigned fields and did nothing at runtime. useChain().wallet is a ChainWalletStore.
• The modal now reads walletState, account and the WC QR URI from the store.
• tsconfig: moduleResolution: bundler, so the exports types in @interchain-ui/vue resolve (its types field is an absolute /dist/... path).
• @interchain-kit/store is added as a dep and kept external in vite, like core.
• examples/vue and the README are updated to the new calls. The other example errors were already there (missing deps and stale interchainjs imports) and are left alone.

Verified locally: pnpm install --frozen-lockfile, pnpm run build (0 error TS), vue-tsc --noEmit on packages/vue, pnpm run test all green. The lockfile diff is just the two dep changes.

Link to Devin session: https://app.devin.ai/sessions/a02c84f654b94cbcb50936e98373fba5
Open in Devin Desktop: https://app.devin.ai/desktop/session/a02c84f654b94cbcb50936e98373fba5?variant=devin
Requested by: @pyramation

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