In the sidebar, show a list of locations you have "pinned"

[rosslh]

When you click the map pin icon (the share button), the share link of the current location should be saved to a panel in the sidebar so you can revisit it later. Currently it just copies the link to your clipboard.

Here is a low fidelity mockup of what the panel in the sidebar might look like:

Each row should bring you to the share URL for that location when you click it. When you hover one of the rows, it should show a copy button with this icon which lets you copy the URL, and a delete button with this icon that allows you to remove the row.

The array of pinned location data (creation date and share URL) should be persisted to localStorage.