fix(ContactBook): clear open menu on add, muxed identicon base address, federation resolution on Enter

[Copilot]

Three behavioral bugs in the Contact Book UI: open context menu not dismissed when add modal opens, muxed address identicons using M-address instead of underlying G-address, and federation addresses not resolved when submitting via Enter without blurring the field.

Changes

• handleAddContact clears open menu — calls setOpenMenuAddress(null) before opening the add modal, consistent with handleEditContact

• Muxed identicon normalization — IdenticonImg now receives getBaseAccount(address) ?? address for muxed contacts instead of the raw M-address:

  publicKey={
    data.resolvedAddress ||
    (isMuxedAccount(address) ? (getBaseAccount(address) ?? address) : address)
  }

• Federation resolution decoupled from blur — removed the hasAddressBlurred/activeField gate in the is-not-federation-failure Yup test. Resolution now triggers whenever the value differs from lastResolvedInput, covering Enter-to-submit without blur. The existing AbortController handles per-keystroke cancellation.

• Test mock updated — added isMuxedAccount and getBaseAccount to the helpers/stellar jest mock in ContactBook.test.tsx

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