feat(react): RBAC roles dashboard with search, grant and revoke modals

[Johnalex-hub]

Implements the Phase 3 RBAC dashboard in react/src/screens.

• Role overview cards with descriptions, permission summaries and per-address status ([Phase 3] Build RolesScreen Dashboard Layout #1224)
• Debounced target address inspection with validation; invalid input clears the role matrix ([Phase 3] Implement Target Address Inspection Search #1225)
• GrantRoleModal: role dropdown, calls grantMinter / grantSuperAdmin ([Phase 3] Build Grant Role Modal Form #1227)
• RevokeRoleModal: impact warning and explicit confirmation, calls revokeMinter / revokeSuperAdmin ([Phase 3] Build Revoke Role Confirmation Modal #1228)
• Privileged actions enabled only for a connected Admin/SuperAdmin wallet

Tests, lint, tsc and builds pass.

Closes #1224
Closes #1225
Closes #1227
Closes #1228

🤖 Generated with Claude Code

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