Add features to Canvas

[rcboufleur]

• Upload cluster catalog and member list files - Allow users to upload files containing cluster definitions and their associated member galaxies.
• Display mask map and depth map overlays - Support visualization of mask and depth maps as optional layers on the sky map.
• Toggle visibility of cluster members - Add an enable/disable button to show/hide galaxies identified as cluster members.
• Toggle visibility of cluster center and radius - Add an enable/disable button to show/hide the cluster center marker and its radius overlay. (fix typo: "raio" → "radius")
• Display membership probability per galaxy - Show the probability of cluster membership for each galaxy (e.g., as a tooltip or color scale).
• Redshift distribution plot for cluster members - Show a histogram of the redshift distribution of galaxies belonging to a selected cluster.
• Color–magnitude diagram for cluster members - Render a color–magnitude diagram (CMD) for galaxies in a selected cluster.
• Luminosity function for cluster members - Plot the luminosity function (magnitude × number count, M × N) for cluster members.
• Selected region overlay via Aladin transparency - Highlight the selected sky region using Aladin Lite's transparency/overlay feature.