Screen: Collection Landing

Route: /c/:slug (legacy /collections/:slug)
Host Component: apps/playground/app/canvas/MarkdownCanvasPage.tsx / CollectionDetailPage
Domain Models: Collection, Page, Note, Note source (rawContent + occurrence map; saved states in BlockRevision)

1. Component & Service Dependencies

SplitCanvasTemplate (apps/playground/app/templates/SplitCanvasTemplate.tsx). Desktop split-pane container.
CanvasProsePanel (apps/playground/app/components/organisms/canvas/CanvasProsePanel.tsx). Renders narrative collection markdown.
CanvasPanelContent (apps/playground/app/canvas/CanvasPanelContent.tsx). Interactive right panel containing CodeMirror editor and timer preview.
CollectionWorkoutsList (apps/playground/app/views/queriable-list/CollectionWorkoutsList.tsx). Searchable list of member workouts.

seedContent (apps/playground/src/services/content/seedContent.ts). Loads collection README.md and workout definitions.
useCanvasRuntime (apps/playground/app/hooks/useCanvasRuntime.ts). Coordinates workout execution directly from canvas cards.

Split Pane Presentation:
- Left Prose Pane (60% width): Narrative description, difficulty badge, category chips, and embedded workouts list with instant search filter.
- Right Interactive Pane (40% width): Sticky interactive CodeMirror preview showing the currently selected workout's raw Whiteboard script.
Header: Sticky collection title bar with "Start Workout" and "Add to Today" buttons.
TOC Rail: Chapter and section links tracking scroll progress through the collection.

Stacked Layout: Split pane collapses to a single vertical scroll stream.
Prose First: Description and README appear at the top, followed by a filterable workout list.
Modal Preview: Tapping a workout opens the interactive preview and runnable controls in a bottom sheet rather than a side pane.
Thumb Dock: Primary FAB launches the featured or first workout in the collection.

Dynamic Content Ownership:
- Clicking any workout item updates the CodeMirror editor pane without full-page navigation.
- The right pane reflects the active workout's live state, while URL updates to reflect the active selection.