Hey.

I experimented with an approach to add responsiveness to the Map + Path canvas. This PR does a few things:

• Splits map and path drawing into separate functions from drawMap()
• Adds a config.full_width boolean that makes the Map take up the full width of the container card.

Some of the changes when config.full_width is set to true:

• div#lovelaceValetudoCard hard-coded width and height are reset with style.width="auto" and style.height="auto".
• div#lovelaceValetudoCard aspect ratio is set to mapWidth / mapHeight.
• drawnMapCanvas.style.width and pathCanvas.style.width is set to 100% to fill the whole container.
• A ResizeObserver listens to container size changes. Inside the callback:
  • dock/vacuum/goToTarget icon left/top pixel positions are replaced with percentages.
  • dock/vacuum/goToTarget icons are scaled based on the container width.
  • CanvasRenderingContext2D: scale() is used to scale everything inside the canvas.
  • map + path canvas are redrawn.

This is still work-in-progress (I only tested with a static map), but asking for feedback about this approach!