Reports showed structure placement could stall if command-line text entry
didn't register (ribbon-invoked commands, dynamic-input/focus interactions).
Make a canvas click ALWAYS place a structure, using whatever values were typed
so far (defaults for the rest) — so dropping an inlet works regardless of typed
entry. If typing works, enter invert/rim/area/C first, then click to place with
those values. Pipes are pick-first: click START then END structure; the pipe
commits on the second click with the current diameter/n.
Drop the early focus_cmd_input() return in the dispatch arms (the normal
dispatch tail already focuses the command line and records last_cmd).
15 module tests green.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
1199895f0e