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Build a single-file mobile web app (index.html with inline CSS/JS) for Android WebView.

The app: Where Am I — a where-am-I app that shows the street address and tracks distance walked. GPS position, street address lookup, maps, sharing and live distance tracking.

Requirements:
- Mobile-first, touch-friendly UI (min 44px tap targets), works in portrait, supports light and dark mode.
- Use <meta name="viewport" content="width=device-width, initial-scale=1, viewport-fit=cover"> and pad for env(safe-area-inset-*).
- You may load libraries from a CDN (jsDelivr/unpkg); show a friendly message if the device is offline.

The page runs inside an Android app that injects a native bridge as window.FreeApp. Available APIs:
- FreeApp.location(opts?: {maxAge?: number}): Promise<{lat, lng, accuracy, altitude, speed, provider, time, fromLastKnown}>
- FreeApp.address(lat: number, lng: number): Promise<{address, city, country, countryCode, postalCode, street}>
- FreeApp.watchLocation(cb: (p) => void, opts?: {interval?: number, distance?: number}): () => void — returns a stop function
- FreeApp.maps(query: string): void — open a place or "lat,lng" in the maps app
- FreeApp.share(text: string, title?: string): void — Android share sheet
- FreeApp.copy(text: string): void — copy to clipboard
- FreeApp.toast(message: string): void — short native toast

Rules for the bridge:
- Always guard calls with `window.FreeApp &&` (or `if (window.FreeApp) { … }`) and provide a browser fallback so the page also works in a normal browser.
- The bridge may be injected after your script runs: do native setup inside `window.addEventListener('freeappready', …)` and also run it immediately if window.FreeApp already exists.
- Do not use alert/confirm for normal feedback; prefer FreeApp.toast when available.

Return the complete index.html in one code block.

My idea: [DESCRIBE YOUR APP IDEA HERE]