feat: add Stellar asset directory search and trustline creator

[dahmeezy]

Add a searchable asset directory component to the wallet dashboard that allows users to browse verified Stellar assets, see issuer details with copy-to-clipboard, and create trustlines via Freighter wallet integration.

Implements #27:

• Searchable asset table with code, truncated issuer (copy button), and verification/trustline status badges
• "Add Custom Asset" modal with react-hook-form + zod validation for asset code (1-12 alphanumeric) and Stellar issuer public key (G+55)
• "Create Trustline" action with Freighter wallet connection check and visual signing feedback (loading spinner, success/error toasts)
• Preset list of popular Stellar assets (USDC, EURC, yXLM, ARST, etc.)
• All styling uses design tokens from tokens.css (no hardcoded colors)
• Integrated into wallet detail page below existing balances table

Files created:

• src/features/wallet/types.ts — StellarAsset type definitions
• src/features/wallet/mock-data.ts — preset asset list
• src/features/wallet/utils/assetUtils.ts — validation + clipboard helpers
• src/features/wallet/schema.ts — zod schema for add-asset form
• src/features/wallet/components/AssetDirectory.tsx — main component
• src/features/wallet/components/AddAssetDialog.tsx — modal form

Summary

Type of change

• Bug fix
• New feature
• Refactor
• Docs

Checklist

• npm run build passes
• npm run typecheck passes
• npm run lint passes
• No secrets in tracked files

Closes #27

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[mergekeeper]

MergeKeeper review

Scope: in scope for linked issue #27.
Verdict: clean

The pull request correctly implements the Stellar asset directory search and trustline creator component meeting all requirements and acceptance criteria.

Reviewed commit: 85b44f8bb434063c8aff4817438197eb3c9bcfe3.
CI and merge eligibility are checked separately.

[mergekeeper]

MergeKeeper merge status

Status: blocked
PR state: open
Mergeability: mergeable
Checked commit: a22502e2ad69759a88e194afc0761a4c4be554e7.

Reason:
GitHub pull request merge request failed with 405: 3 of 3 required status checks have not succeeded: 2 expected.

Next steps:
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[mergekeeper]

Approved

Pull request implements the Stellar asset directory, modal validation, trustline creator, and utility helpers according to requirements.

[mergekeeper]

Approved

The pull request correctly implements the Stellar asset directory search and trustline creator component meeting all requirements and acceptance criteria.

[mergekeeper]

Merged

Merged with squash.