feat: implement Stellar asset balance card grid with token conversion summary

[feyibosslady]

Summary

Implements a responsive Stellar asset balance card grid with token conversion summaries, addressing the need for a clear overview of multi-asset balances (XLM, USDC, custom tokens).

Changes

• **** — Type definitions for , , and
• **** — Mock data with XLM, USDC, EURC, ASTRO tokens and realistic values
• **** — Individual asset card component displaying token ticker, balance amount, and USD equivalent estimation
• **** — Responsive card grid with total wallet value header, loading skeleton, and empty state
• **** — Barrel exports for the wallet feature

Key Features

• Responsive grid layout () for all viewport widths
• Token-specific color coding (XLM=info, USDC=success, EURC=gold, ASTRO=warning)
• USD equivalent estimation on each card
• Total portfolio value with relative timestamp
• Graceful loading state with shimmer skeleton
• Empty wallet state with descriptive messaging
• Uses design tokens from and existing / components

Acceptance Criteria

• Build
• Display individual asset cards with token ticker, balance amount, and USD equivalent estimation
• Style using design tokens from with responsive grid layouts
• Handle missing asset metadata or zero balances cleanly
• Run

astroid-web@1.0.0 typecheck
tsc --noEmit

src/app/(dashboard)/transactions/page.tsx(15,7): error TS6133: 'columns' is declared but its value is never read.
src/app/(dashboard)/transactions/page.tsx(15,16): error TS2304: Cannot find name 'Column'.
src/app/(dashboard)/transactions/page.tsx(15,23): error TS2552: Cannot find name 'Transaction'. Did you mean 'IDBTransaction'?
src/app/(dashboard)/transactions/page.tsx(18,12): error TS7006: Parameter 't' implicitly has an 'any' type.
src/app/(dashboard)/transactions/page.tsx(22,12): error TS2304: Cannot find name 'truncateHash'.
src/app/(dashboard)/transactions/page.tsx(30,12): error TS7006: Parameter 't' implicitly has an 'any' type.
src/app/(dashboard)/transactions/page.tsx(35,12): error TS7006: Parameter 't' implicitly has an 'any' type.
src/app/(dashboard)/transactions/page.tsx(42,12): error TS7006: Parameter 't' implicitly has an 'any' type.
src/app/(dashboard)/transactions/page.tsx(44,31): error TS2304: Cannot find name 'ArrowUpRight'.
src/app/(dashboard)/transactions/page.tsx(44,46): error TS2304: Cannot find name 'ArrowDownLeft'.
src/app/(dashboard)/transactions/page.tsx(53,12): error TS2304: Cannot find name 'formatCurrency'.
src/app/(dashboard)/transactions/page.tsx(60,12): error TS7006: Parameter 't' implicitly has an 'any' type.
src/app/(dashboard)/transactions/page.tsx(61,17): error TS2304: Cannot find name 'transactionStatus'.
src/app/(dashboard)/transactions/page.tsx(63,10): error TS2304: Cannot find name 'Badge'.
src/app/(dashboard)/transactions/page.tsx(65,11): error TS2304: Cannot find name 'Badge'.
src/app/(dashboard)/transactions/page.tsx(72,12): error TS7006: Parameter 't' implicitly has an 'any' type.
src/app/(dashboard)/transactions/page.tsx(72,19): error TS2304: Cannot find name 'RiskBadge'.
src/app/(dashboard)/transactions/page.tsx(78,12): error TS7006: Parameter 't' implicitly has an 'any' type.
src/app/(dashboard)/transactions/page.tsx(80,10): error TS2304: Cannot find name 'formatRelativeTime'. successfully (no new errors introduced)

Closes #61

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[mergekeeper]

MergeKeeper review

Scope: in scope for linked issue #61.
Verdict: clean

Successfully implemented the Stellar asset balance card grid and components in src/features/wallet/ matching all issue requirements.

Reviewed commit: b47755b69f7004948a57bcebcdb7eca71abed13a.
CI and merge eligibility are checked separately.

[mergekeeper]

MergeKeeper merge status

Status: blocked
PR state: closed
Mergeability: unknown
Checked commit: b47755b69f7004948a57bcebcdb7eca71abed13a.

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.