feat(frontend): add pool management dashboard page for creators

[oncleweynom]

What
Adds a creator-only pool management dashboard at /dashboard.

Why
Pool creators need a central place to monitor their campaigns, track donations, and take actions like withdrawing funds or archiving pools — without navigating away from the app.

Changes
page.tsx
— new page
Behaviour
Wallet gate — unauthenticated users see a connect prompt instead of the dashboard
Summary bar — at-a-glance stats: total pools, active pools, total raised, contributor count
Pool list — each row shows title, description, status badge, progress bar, contributor count, category, and created date
Per-pool actions: Edit (links to /pools/[id]/edit), Withdraw (only enabled when pool is Completed), Archive
Confirmation modal before any destructive action (withdraw or archive)
Bulk selection with select-all checkbox and "Archive selected" action
Loading skeleton while data resolves, empty state with CTA when no pools exist
Mock Data
Real pool data depends on backend/contract endpoints not yet implemented. Pool list uses clearly marked mock data with // TODO: Replace with real API call comments. Maintainers replace these once the dependent work lands.

Build
next build --webpack passes clean ✓
ESLint + Prettier pre-commit hooks pass ✓

closes #428

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