feat(wallet): native Phantom Solana integration

[kostovster]

Summary

• Replaces the Phantom EVM-compat path with native Solana provider integration via window.phantom.solana, mirroring the existing Solflare wiring.
• Removes WalletConnectMechanism.EVM_PHANTOM, the MetaMaskWallet class, and the entire src/networks/evm/ directory — neither path was exposed to users, so no deprecation window is needed.
• Hardens both Solflare and the new Phantom path with strict isSolflare === true / isPhantom === true provider-identity guards.

Closes #154.

Changes

• Native Phantom: connectPhantom.ts rewritten to mirror connectSolflare.ts; constructs SolanaWallet("phantom"), persists SOL_PHANTOM, calls IntercomService.load(addr, "phantom"). New authenticatePhantom factory in WalletFactory.ts paralleling authenticateSolFlare.
• SolanaWallet parameterized: constructor takes a required provider: "solflare" | "phantom" argument. getProvider() reads window.solflare or window.phantom?.solana and validates the identity flag — defends against wallet-aggregator placeholder injection.
• Enum rename (atomic): WalletConnectMechanism.EVM_PHANTOM → SOL_PHANTOM = "sol_phantom". WalletActions.CONNECT_EVM_PHANTOM → CONNECT_SOL_PHANTOM = "CONNECT_SOL_PHANTOM" (member name AND string value).
• EVM stack removed: src/networks/evm/{wallet,wallet.test,sign,sign.test,index}.ts deleted along with the corresponding per-file coverage thresholds in vitest.config.ts.
• Routing wired: walletProtocolFilter.ts, WalletConnect.ts, WalletInfo.vue, webmcp/tools.ts updated. walletActionMap now exported for the new end-to-end wiring test.
• Defensive comment on NolusWalletOverride.getGasInfo documenting that the pubkey: Pubkey parameter is load-bearing for the Solana Ed25519 path.

Test coverage added

• signDirect throws (pinned).
• Bytes passed to provider.signMessage are byte-equal to SignDoc.encode(signDoc).finish() — locks the wire format.
• Signed AuthInfo.signerInfos[0].publicKey.typeUrl === "/cosmos.crypto.ed25519.PubKey" — locks Ed25519 over secp256k1.
• isPhantom/isSolflare strict-equality guards (placeholder providers throw).
• End-to-end mechanism→action wiring: every WalletConnectMechanism value has a registered, callable Pinia action.
• WebMCP MECHANISM_BY_LABEL / ACTION_BY_MECHANISM map consistency, plus a source-grep that locks the absence of EVM_PHANTOM / CONNECT_EVM_PHANTOM / MetaMaskWallet.

Verification

• npx tsc --noEmit clean.
• npm run lint clean.
• npm run format:check clean.
• npx vitest run — 760/760 passing (down from 782 because 22 EVM-only tests were deleted with the directory).
• npm run build clean.
• grep -rn "EVM_PHANTOM\|evm_phantom\|CONNECT_EVM_PHANTOM\|MetaMaskWallet\|@/networks/evm" src/ vitest.config.ts — only allowed hits are anti-drift assertions inside webmcp/tools.test.ts that verify the strings do NOT appear in tools.ts.

Notes

• localStorage.wallet_connect_mechanism value transitions from "evm_phantom" to "sol_phantom". WalletManager.getWalletConnectMechanism already self-heals unknown values via its Object.values(WalletConnectMechanism).includes(...) validator — testers carrying "evm_phantom" get cleared and reconnect once. Per Migrate Phantom from EVM compat to native Solana provider #154 scope, no migration shim is added.
• ethers ^6.16.0 is now an orphan dependency in package.json (the only consumer was MetaMaskWallet). Tracked as a follow-up; the issue scope excluded package.json cleanup.
• A symmetric isKeplr === true guard for WalletUtils.getKeplrExtension would be a sensible follow-up — same defense the Solana path now has.

Follow-ups (out of scope)

• Drop orphan ethers from package.json.
• Add isKeplr === true guard on the Keplr injection path.
• Devnet broadcast smoke for Phantom and Solflare (deferred to Solana go-live).