Add display name for Excalidraw component so it doesn't show as anonymous

Editor assessment

The subject states the change and its benefit: a display name added for the Excalidraw component so it no longer shows as anonymous. The fix type suits the debugging affordance, and the absent scope is tolerable. The body restates the subject word for word, contributing nothing about where the name is registered or the tooling that displayed anonymous. The PR reference is well-formed. Hygiene is clean. Understandable and even well-motivated at the headline level, but the verbatim-echo body subtracts value rather than adding it.