These control-thread edits preserve project format 15. Session selections,
clipboard and comparison snapshots are not saved in projects. Audio callbacks
continue to consume prepared plans; edits use the existing stop/history workflow.
## Phase 47
Shift-click clips to toggle selection; Ctrl+A in the sequencer or Edit/Select all clips selects every clip. Plain clicking replaces the selection. Selection is session UI state; no marquee selection yet.
Use Left/Right in the sequencer (or Edit/Nudge selection) to move the selected phrase by the current snap step. Ctrl+D duplicates after its complete bounding span; Delete removes selected clips. Edits are atomic and undoable. Mouse dragging remains a single-clip gesture.
