v1.3.0

Added

• Favorite share links: each saved favorite now includes a share action that generates a deep link to the exact saved location, suitable for native sharing targets like WhatsApp or copying as a URL.

Changed

• README refresh: updated the project README to match the shipped app behavior, including the crosshair-based favorite flow, favorite sharing, favorites map overlay, GeoJSON backup, and current test coverage.
• Favorite save flow: adding a favorite now enters a map-selection mode with a centered crosshair so the user can pan and zoom before saving the current center point.
• Favorite naming UI: replaced the browser prompt with a compact centered modal shown after location selection, keeping the map interaction and naming steps separate.
• Shared location startup: the map now reads lat, lng, and optional z query parameters on page load and opens directly at the shared location when present.
• Product spec updated (v1.8): favorites sharing, deep-link startup behavior, architecture, component inventory, and test counts now reflect the share URL flow.