Add Storybook stories for sonner toast wrapper

[Johnero542]

Created sonner.stories.tsx with interactive toast triggers for success, error, info, and warning toast types. Includes stories for default state, individual toast types with descriptions, and long-message scenarios. All toasts render with proper icon and theme support through Sonner's theming system.

Add Storybook stories for tabs component

Created tabs.stories.tsx with comprehensive tab interaction patterns: default 3-tab layout (All/Receiving/Sending dashboard tabs), 4-tab extended layout, line variant styling, disabled tab state, and interactive component tracking active tab. Demonstrates keyboard navigation support and tab content switching.

Add Storybook stories for token-amount formatter

Created token-amount.stories.tsx covering amount formatting edge cases: small amounts (0.001 USDC), standard amounts (1 USDC), very large amounts (1,234,567.89 USDC), compact notation for large values (1.2K, 5.4T), different tokens (EUR, WBTC), and customizable fraction digits. Includes side-by-side comparison of normal vs compact formatting.

Add Storybook stories for tx-preview-dialog

Created tx-preview-dialog.stories.tsx with all three simulation states: simulating (spinner, no preview), successful simulation (fee/resource display, confirm enabled), and failed simulation (error message, confirm disabled). Includes pending sign state and interactive dialog with form handling.

Closes #727
Closes #728
Closes #729
Closes #730

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name: Pull request
about: Describe a focused change and how it was verified
title: 'feat: '
labels: enhancement

Issue

Closes #

Summary

Describe the user or maintainer-facing change.

Changes

Test plan

• I added or updated automated tests.
• I ran the relevant test suite.
• I checked the change in the affected environment.

Checklist

• The change is scoped to the linked issue.
• Documentation and configuration were updated where needed.
• No secrets, private keys, or wallet credentials are included.

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