fix: make WalletConnectButton connected state interactive

[Sammygee12]

Overview

This PR fixes the dead interactive element in WalletConnectButton's connected state by replacing the no-op <button> with a Radix UI DropdownMenu. The connected wallet display now opens a menu with Copy Address, View on Explorer, and Disconnect actions, and the unused onOpenModal prop has been removed.

Related Issue

Changes

🎛️ Connected-Wallet Dropdown Menu

• [MODIFY] src/components/WalletConnectButton.tsx

  • Replaced the connected-state <button> with a Radix UI DropdownMenu trigger, keeping the truncated-address + green-dot visual and adding a chevron affordance.
  • Added Copy Address — copies the full connected public key to the clipboard with temporary "Copied!" feedback.
  • Added View on Explorer — opens the connected account in a new tab on the Stellar explorer.
  • Added Disconnect — clears the wallet connection and returns the user to ConnectScreen.
  • [REMOVE] Unused onOpenModal optional prop and its no-op onClick handler — no caller in the codebase ever passed it.

• [ADD] src/components/__tests__/WalletConnectButton.test.tsx

  • Coverage for dropdown rendering, copy-address behaviour, explorer link, disconnect flow, and absence of onOpenModal.

Verification Results

npm test -- src/components/__tests__/WalletConnectButton.test.tsx
✅ 4/4 passed

Manual acceptance check:
✅ Clicking connected wallet opens dropdown with 3 visible actions
✅ Copy Address places full public key on clipboard
✅ View on Explorer opens account in new tab
✅ Disconnect clears connection and returns to ConnectScreen
✅ onOpenModal prop removed — zero remaining references

Acceptance Criteria	Status
Clicking the connected wallet display produces a visible, useful result	✅ Dropdown menu opens with Copy Address, View on Explorer, and Disconnect
Connected address can be copied from the header area	✅ Copy Address copies the full public key to the clipboard
Disconnecting from the header area works and returns user to ConnectScreen	✅ Disconnect clears state and routes back to ConnectScreen
onOpenModal is either removed or has at least one caller	✅ Prop removed; no references remain in the codebase

Closes #438

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