Enable per-workspace styling by adding the workspace name as a
CSS class to each workspace button. The name is sanitized to a
valid CSS identifier: lowercased, non-alphanumeric characters
collapsed to hyphens, digit-leading names prefixed with "ws-".
Examples: "IDE" → .ide, "special:telegram" → .telegram, "1" → .ws-1
Allows users to style individual workspaces:
#workspaces button.telegram { color: #54a0e0; }