# Continuum Scratchpad and Window Actions Design

## Purpose

Complete Continuum as a practical GNOME-like window overview: windows can be moved directly between workspaces, closed without first focusing them, and set aside in one global scratchpad shelf.

## Experience

- Every window thumbnail is clickable, draggable, and gains a quiet close button on hover or keyboard focus.
- Dropping a thumbnail on a workspace card moves it there without leaving the overview.
- A global scratchpad shelf sits along the bottom of Continuum. Empty, it is a subtle drop target. Populated, it expands into a horizontal row of live cards.
- Dropping a normal window on the shelf sends it to `special:scratch`. Clicking a shelf card restores it to the selected positive workspace, focuses it, and closes Continuum.
- `Super+X` continues to toggle the global scratchpad and `Super+Shift+X` continues to send the active window there.
- Closing a thumbnail asks Hyprland to close exactly that address and leaves the overview open.
- Drag operations have restrained scale/highlight feedback, never continuous decorative animation.

## Architecture

`WindowThumbnail.qml` owns pointer drag initiation, hover chrome, and close intent. It emits `activated`, `closeRequested`, and `dragStarted/dragFinished` signals with its toplevel; it does not dispatch compositor commands.

`WorkspaceCard.qml` becomes a drop destination and forwards window actions to `OverviewBody.qml`. `OverviewBody.qml` is the sole compositor-command boundary for focus, close, workspace moves, and scratchpad moves, keeping address normalization in one place.

`ScratchpadShelf.qml` renders the special workspace model and provides the global drop target. `ScratchpadCard.qml` reuses the same thumbnail presentation at a compact size.

The shelf reads the Hyprland workspace whose name is `special:scratch`. Positive workspaces remain the only entries in the filmstrip and search model.

## Keyboard and Input

- Left/Right selects workspaces when search is empty.
- Enter opens the selected workspace or focused search result.
- Delete closes the keyboard-selected window.
- Escape closes Continuum.
- Pointer dragging never activates a window on release after a successful drag.

## Failure Handling

- Missing or stale addresses make the command a no-op and trigger a workspace/toplevel refresh.
- If the scratch workspace does not yet exist, the first drop creates it through Hyprland's normal special-workspace move dispatcher.
- Closing or moving a window invalidates captures; Continuum refreshes models and recaptures after the compositor reports the change.

## Verification

- Static contracts confirm all dispatches are address-scoped and the shelf only targets `special:scratch`.
- Live tests create disposable windows, move them across workspaces and into/out of the scratchpad, close only the intended disposable window, and restore the user's prior workspace.
- Visual captures cover the empty shelf, populated shelf, workspace drop target, and hover close control.
- Existing focus and overview-search tests remain green.
