feat(governance): implement multi-sig signer management and threshold view (#59)

[Victorakinwunmi]

Closes #59

Summary of Changes

• Created src/features/governance/components/SignerManagementView.tsx providing a multi-sig signer management interface.
• Added client-side validation for Stellar public keys (G..., 56 base32 characters).
• Implemented signer addition, removal, and custom weight assignment.
• Implemented low, medium, and high threshold configuration controls.
• Added type definitions in src/types/governance.ts (Signer, ThresholdConfig) and re-exported in src/types/index.ts.
• Structured with responsive Tailwind CSS layouts and Lucide React icons.

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[mergekeeper]

MergeKeeper review

Scope: in scope for linked issue #59.
Verdict: clean

Successfully implemented multi-sig signer management and threshold configuration view along with required types and supporting components.

Reviewed commit: a2885529c2a827ae307dd01020e256ca29ac62d2.
CI and merge eligibility are checked separately.

[mergekeeper]

MergeKeeper merge status

Status: blocked
PR state: open
Mergeability: mergeable
Checked commit: a2885529c2a827ae307dd01020e256ca29ac62d2.

Reason: One or more required CI checks failed.

Failing checks:

• build - view details

Next steps:

1. Open the failing check details above and fix the reported error.
2. Run the same checks locally where possible.
3. Commit and push the fix.
4. MergeKeeper will automatically re-review the updated PR.

[mergekeeper]

Needs changes

The PR introduces unrelated modifications to the transactions page and removes existing table column definitions and components.

• src/app/(dashboard)/transactions/page.tsx:1: Significant refactoring and removal of transaction table columns and query logic in the transactions page is out of scope for issue feat: implement multi-sig signer management and threshold configuration view #59.

Reviewed commit: e460ee0203a299664e06a7a782e875f287fd608a.

[mergekeeper]

Needs changes

The PR introduces unrelated changes in transactions/page.tsx that are outside the scope of issue #59.

• src/app/(dashboard)/transactions/page.tsx:13: Unrelated modification introducing Badge and RiskBadge components in the transactions page, which is out of scope for issue #59.

Reviewed commit: da3aa15da8920a91115e06441a78d771cae66d89.

[mergekeeper]

Needs review

Linked to #59, but the diff does not match the issue scope.

The pull request includes extensive refactoring and unrelated modifications to transactions page and types index which are out of scope for issue #59.

Reviewed commit: b0be7de214f6ab8b47e2779003d16ebaf70ea4d0.

[mergekeeper]

Needs changes

The PR introduces unrelated modifications to the transactions page and removes existing table column definitions and components.

• src/app/(dashboard)/transactions/page.tsx:1: Significant refactoring and removal of transaction table columns and query logic in the transactions page is out of scope for issue #59.

Reviewed commit: e460ee0203a299664e06a7a782e875f287fd608a.