* refactor: adapt BlockWidget to use shared container map
Enable BlockWidget to reuse DOM containers via a shared map
Pass container map into widget decorations to preserve portals across updates
* feat: enable drag-to-select and guard new comments in FilesView
Guard new comment input from opening during drag-to-select actions
Enable drag-based line selection with initial drag state and mobile support
Reset dragging state on mouseup to end the selection
* fix(PlanView): gate new comment input during dragging
Add drag state to disable new comment input during selection drag
Indicate drag mode during mobile tap-extend to avoid unintended actions
Pass drag state to child UI to reflect ongoing drag
Nelson Pires
8d8abdb54b