Add toast notification system with warning variant, queue, and keyboard dismiss

[Chinonso-Peter]

Summary

Adds a comprehensive toast notification system per #613.

Changes

• Toast.tsx (new): Individual toast component with success/error/warning/info variants, Escape key dismissal, role=\status\ and aria-live=\polite\ for accessibility
• useToast.ts: Added warning variant; error toasts persist until manually dismissed (no auto-dismiss); queue capped at 3 visible toasts (oldest non-error removed when full); auto-dismiss timeout changed from 6s to 5s
• ToastContainer.tsx: Refactored to use the new Toast component internally
• index.css: Added --toast-warning-* CSS variables and .toast-warning styles for both dark and light themes
• Updated tests and Storybook stories to cover the warning variant and queue/auto-dismiss behavior

Closes #613

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Review details

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📥 Commits

Reviewing files that changed from the base of the PR and between 10f827c and a61ed43.

📒 Files selected for processing (18)

• frontend/src/components/CampaignDetailPanel.tsx
• frontend/src/components/CampaignTimeline.tsx
• frontend/src/components/CampaignsTable.tsx
• frontend/src/components/ContributorSummary.tsx
• frontend/src/components/CreatorAnalytics.tsx
• frontend/src/components/IssueBacklog.tsx
• frontend/src/components/SkeletonAnalytics.tsx
• frontend/src/components/SkeletonCard.tsx
• frontend/src/components/SkeletonIssueList.tsx
• frontend/src/components/SkeletonTimeline.tsx
• frontend/src/components/Toast.tsx
• frontend/src/components/ToastContainer.a11y.test.tsx
• frontend/src/components/ToastContainer.stories.tsx
• frontend/src/components/ToastContainer.tsx
• frontend/src/hooks/useMinDisplayTime.ts
• frontend/src/hooks/useToast.test.ts
• frontend/src/hooks/useToast.ts
• frontend/src/index.css

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