Add Storybook stories for countdown-timer component

[katefominmoore23]

Created comprehensive countdown-timer.stories.tsx with stories for far-future targets (30 days), imminent targets (5 minutes), and expired states (1 hour ago). Includes stories for custom ended labels, very short time remaining (30 seconds), multiple states in one story, custom className variants, and intermediate durations (1 day, 1 hour). Stories demonstrate live countdown updates and state transitions using React's Date.now() for realistic time calculations.

Add Storybook stories for card component layout primitive

Created card.stories.tsx showcasing all Card component compositions: basic card with content only, cards with headers and titles, cards with header descriptions, complete cards with header/content/footer, cards with action slots, default and small size variants, multiple card grids, complex content layouts, interactive hover states, and size comparison. Stories cover all subcomponents (Card, CardHeader, CardTitle, CardDescription, CardContent, CardFooter, CardAction) with realistic examples of common UI patterns.

Add Storybook stories for dialog component

Created dialog.stories.tsx with stories for basic dialog with trigger, dialogs with footer actions, dialogs without close button, long-content scrolling, stream operation (withdrawal) dialog, alert-style dialog with destructive actions, form-based dialog, and complex header structures with multi-section layouts. Stories demonstrate Dialog/DialogTrigger/DialogContent/DialogHeader/DialogTitle/DialogDescription/DialogFooter composition with varied button configurations and content patterns.

Add Storybook stories for dropdown-menu component

Created dropdown-menu.stories.tsx with stories for basic menus, grouped menu items with labels, checkbox-style radio selection (network/theme switching), theme selector with checked indicators, navbar-style dropdowns with icon triggers, large menus with multiple groups, nested menu simulation, destructive action groups, and alignment variations (start/center/end). Stories showcase DropdownMenu/DropdownMenuTrigger/DropdownMenuContent/DropdownMenuGroup/DropdownMenuLabel composition with state management and visual indicators for selected items.

Closes #719
Closes #720
Closes #721
Closes #722

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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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