Feat/add utxo namespace to wallet connect

[RyukTheCoder]

Summary

Add a UTXO namespace to the WalletConnect hub provider with Bitcoin connect/disconnect/eager-connect support and a transfer signer.

Changes

• New namespaces/utxo with connect, disconnect, and eager-connect actions
• Bitcoin transfer signer (signers/utxo.ts) and BTC entry in provider metadata

Test Plan

• UTXO: connect WalletConnect with BTC namespace selected; verify Bitcoin address is returned
• UTXO: sign a Bitcoin transfer (if applicable in your test flow)

Checklist:

• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have added tests that prove my fix is effective or that my feature works
• Implemented a user interface (UI) change, referencing our Figma design to ensure pixel-perfect precision.

[arlert-armin]

LGTM

[RyukTheCoder]

c40a8b0 — fix(walletconnect-2): share one AppKit modal across namespaces

Bug: a stray back button appeared in the WalletConnect modal header when opening one namespace's modal after the other (e.g. connect EVM, then open BTC).

Root cause: AppKit's controllers (RouterController, ChainController, …) are module-level singletons. The per-namespace modal was rebuilt on every switch, so each rebuild re-ran AppKit init against those same globals and left the previous open's router history behind → an extra router step → the back arrow. There was never really more than one live instance to begin with.

Fix: build the modal once with both networks registered up front ([mainnet, bitcoin]) and pick the active one per connect with switchNetwork. open() then sees a matching active chain and takes its clean, non-switching path — no back button.

Changes:

• modal.ts — single instance; prepareModalForNamespace runs ready() + switchNetwork() before open(). The active chain is now shared mutable state, safe only because connects are serialized by the adapter's #sessionQueue (documented inline).
• modal-cache.ts — build once, no per-namespace rebuild.
• adapter.ts — drop namespace from getModal (one instance now).
• lifecycle.ts — call prepareModalForNamespace before open; reuse WC_NAMESPACE_TO_CAIP for the open namespace instead of sniffing the connect-payload keys.

Note: the earlier ConnectorController filter attempt and the extra @reown/appkit-controllers dependency were reverted — the 530→9/40 wallet count turned out to be a harmless placeholder, not a bug. This commit is back-button-only, no new dependency.

Green: ts-check, lint, build all pass.