feat(react): Phase 3 wallet disconnect, network mismatch warning, and RBAC hooks

[Rhema888]

Overview

This PR implements Phase 3 frontend building blocks in accordance with repository conventions:

• [Phase 3] Implement Wallet Disconnect and Signer Purge ([Phase 3] Implement Wallet Disconnect and Signer Purge #1174): Disconnect action thoroughly wipes cached keys, terminates adapter listeners, unsets signers on client instances, and transitions to disconnected state.
• [Phase 3] Detect Stellar Network Passphrase Mismatch ([Phase 3] Detect Stellar Network Passphrase Mismatch #1175): Enters wrong-network state upon passphrase divergence and displays warning banner with expected vs actual network passphrases in ConnectWallet.
• [Phase 3] Build useRbacRoles Hook for Full Role Mapping ([Phase 3] Build useRbacRoles Hook for Full Role Mapping #1187): Checks hasRole for Admin, SuperAdmin, Minter, and Pauser against target address with refetch and polling capability.
• [Phase 3] Build useRoleAdmins Hook for RBAC Hierarchy ([Phase 3] Build useRoleAdmins Hook for RBAC Hierarchy #1189): Queries role admin authorities and super admin accounts for governance introspection with refetch capability.

Acceptance Criteria & Verification

• Unit tests pass cleanly (16 suites, 176 tests passing).
• Strict TypeScript compliance with noImplicitAny and strict null checks.

Closes #1174
Closes #1175
Closes #1187
Closes #1189

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