Expand statistics with year-over-year insights and dashboard sparklines

[panteLx]

Summary

• Expands the statistics page: savings rate, average booking size, largest expense, year-over-year deltas on the KPI tiles, a weekday spending-pattern chart, and a this-year-vs-last-year comparison chart.
• Integrates statistics into the dashboard as quiet inline sparklines on the existing KPI tiles (Saldo/Einnahmen/Ausgaben/Buchungen), reusing the statistics page's query key so navigating between the two pages doesn't refetch.
• /api/statistics now also returns previousYear, weekday, topExpense, and per-month transactionCount.
• Adds a StatTileTrend client component so the sparkline (which needs recharts + useId) doesn't force StatTile itself into a client-only component — StatTile is also rendered directly from the server-rendered app/t/[slug]/page.tsx, which passes lucide icon components as props that can't cross the server/client boundary.

Test plan

• npx tsc --noEmit — no errors
• npx eslint on changed files — clean
• npm run build — succeeds, including /t/[slug]
• Manually verified dashboard and statistics pages in the browser (light/dark, desktop/mobile) against the seeded demo account
• Verified /t/[slug] (public tracker page) renders correctly at runtime after the client/server boundary fix

🤖 Generated with Claude Code

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Review details

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: edac9779-c6ba-4dd0-a79c-4082daab7b16

📥 Commits

Reviewing files that changed from the base of the PR and between 89f5d47 and 3e28637.

📒 Files selected for processing (5)

• app/api/statistics/route.ts
• components/dashboard/dashboard-client.tsx
• components/statistics/statistics-client.tsx
• components/ui/stat-tile-trend.tsx
• components/ui/stat-tile.tsx

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