feat(wallet): EIP-6963 multi-wallet discovery in the browser bridge

[MuncleUscles]

What

The browser-wallet bridge page grabbed the single injected window.ethereum, which is ambiguous when multiple wallet extensions are installed (they clobber each other on that global). Adopt the standard EIP-6963 discovery mechanism.

On load the page dispatches eip6963:requestProvider and collects each eip6963:announceProvider ({info:{name,icon,rdns,uuid}, provider}) into a list, then routes every provider call — eth_requestAccounts, eth_chainId, wallet_switchEthereumChain, wallet_addEthereumChain, eth_sendTransaction, accountsChanged — through one selected active provider instead of window.ethereum.

Behavior

• 1 wallet announced → auto-select (no picker friction).
• ≥2 wallets → a hand-rolled picker (icon + name), styled to match the existing page.
• 0 announced → fall back to window.ethereum (older wallets that don't speak 6963), else a clear "no wallet detected" message.
• Also subscribes chainChanged (the page only heard accountsChanged) to warn on a mid-session network switch; ensureChain() still corrects it before each tx.

Scope

• Only src/lib/wallet/bridgePage.ts (the inline page) + the Playwright mock. Transport, session daemon, and the /api/* contract are untouched — the active-provider layer only funnels the same calls through a chosen object.
• The Tier-2 mock (e2e/fixtures/mockProvider.ts) now announces via eip6963:announceProvider (and keeps window.ethereum) so the browser-signing lanes discover it.

Test

Local Tier-2 browser-signing suite: 9 passed / 1 skipped (the skip is the nightly Docker deploy lane) — staking (validator-join + session reuse), config-default walletMode, reject (4001) + tab-closed error lanes, and the full wallet-session lifecycle. tsc clean; build inlines the page.

[coderabbitai]

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