RFD 1116: Tasks panel, Clear unloads the model, done stays separate
Problem
The Tasks panel carries two controls a rewrite kept conflating: a collapse toggle on the completed-task list, and a Clear action. Clear must unload the viewport model, matching the Worlds panel’s own Clear. A rewrite twice narrowed Clear back down to clearing the task list alone, and once dropped the completed-list collapse control outright.
Decision
The completed-task list collapses through expand-icon-button and task-completed-expand-btn, the same pattern the Bone Structure panel uses. Clear calls clearModel() whenever currentModel is set, unloading the viewport, then calls clearCompletedTasks(), which removes only the completed rows from the list. Task history outside the completed rows survives a viewport Clear.
bash scripts/verify_tasks_panel_ui.sh runs before a merge touching this toolbar.