feat: FAQ page with FAQPage schema

[KMKoushik]

What changed

• New public page /faq answering five questions: is it free, limits, offline, currencies, export. It reuses the existing Faq block and faqJsonLd, so the page has FAQPage structured data that matches the visible text.
• /faq is added to sitemap.xml, so the "FAQ page in sitemap" check passes once this is deployed.
• An FAQ link is added to the footer under Resources.

Where the answers come from

• Free: same wording as the landing page. There's no billing code in the repo. I left out ads because they're configured per environment and are off in production right now.
• Limits: MAX_AMOUNT_CENTS (21,474,836.47), FILE_SIZE_LIMIT (5 MB) and quick split's MAX_PEOPLE (20). I found no cap on groups or friends. The Splitwise "4 per day" figure is the same sourced claim the landing page and blog already make.
• Offline: next-pwa makes the app installable, but changes go through tRPC and there's no offline queue, so the page says no. Users can pick a past date when they add an expense.
• Currencies: "more than 100" (119 in currency.ts). Balances are kept per currency, groups have a default currency, there's no exchange-rate conversion, and a quick split uses one currency.
• Export: the CSV export on a friend's page (getExpensesWithFriend includes expenses in shared groups) and the JSON "Download splitpro data" on the Account page (friends, groups, balances). The page says there's no group CSV export yet.

How I checked it

• npx prettier --write, npx tsc --noEmit -p . (clean) and SKIP_ENV_VALIDATION=1 pnpm lint (no new warnings)
• On a local next dev: /faq returns 200 with the FAQPage JSON-LD, and /sitemap.xml lists https://splitpro.app/faq

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📥 Commits

Reviewing files that changed from the base of the PR and between 5946d5a and 59ef6ae.

📒 Files selected for processing: 3

• src/components/Site/SiteLayout.tsx
• src/pages/faq.tsx
• src/pages/sitemap.xml.ts

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