# card_stack


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## Response Builders

Shared helpers that assemble OOB response tuples for card stack
operations.

- **Slots only** — early returns and exit-split-mode (just viewport
  section swaps)
- **Navigation response** — navigation and enter-split-mode (slots +
  progress + focus)

## Navigation Handler

## Enter/Exit Split Mode Handlers

## Update Viewport Handler

Handler for updating the viewport when card count changes. Does a full
viewport swap (outerHTML) since the number of slots changes.

## Save Width Handler

Saves the card stack width to server state for persistence across page
loads.

## Router Initialization

Creates the card stack router with navigation, viewport, and split mode
routes.

------------------------------------------------------------------------

### init_card_stack_router

``` python

def init_card_stack_router(
    state_store:SQLiteWorkflowStateStore, # The workflow state store
    workflow_id:str, # The workflow identifier
    prefix:str, # Route prefix (e.g., "/workflow/seg/card_stack")
    urls:SegmentationUrls, # URL bundle (populated after routes defined)
)->Tuple: # (router, route_dict)

```

*Initialize card stack routes for segmentation.*