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feat(frontend): unified async loading and error display components #61

@Shakalito

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@Shakalito

Create reusable UI patterns for async states and API error handling.

AC:

  • Shared ErrorBanner / LoadingState components

  • Forms disabled during submit consistently

  • Human-readable API error messages (no [object Object])

  • Applied to Login/Register, Alerts, Portfolio trade forms

Deps

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    enhancementNew feature or requestfrontendUser interface, dashboards, charts, and client-side state management.

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