Adds /invoices/upload-receipts as the dedicated explainer for the
mobile scanner PWA: install instructions for iOS/Android, direct
deep-link button, and a walkthrough of the scan -> verify -> save
flow. Sidebar entry replaces the old "Scan receipt" tab so the
desktop side picks up the install steps before sending users to
the mobile-only surface.
Scanner layout moves PWA manifest + apple-* meta tags from inline
JSX into Next.js's metadata/viewport exports so the App Router
doesn't try to render a second <head>, fixing a hydration error
that surfaced as two console warnings on the scan page.
Scanner shell gains a centered Port Nimara logo header so the
standalone PWA looks branded when launched from the home screen
without the dashboard chrome.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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