feat: mobile Spaces nav and list-based project/workspace views

- Combine Projects and Workspaces into a single 'Spaces' grouped mobile
  nav item that opens a bottom-sheet menu.
- Add SpacesBottomSheet component with Projects/Workspaces options.
- Extend MobileListView with optional renderItem prop for rich rows.
- Redesign mobile ProjectsPage rows to show project description and
  repository chips.
- Replace mobile WorkspacesPage list with compact WorkspaceCard grid,
  matching desktop card content.
- Add mobile-list-* CSS and mobile-workspaces-list spacing.

Quality gates: npm run typecheck, npm run lint clean,
npm test -- --run 87 passed.

apps/web/src/components/features/mobile/.pi-map.index.md

@@ -2,7 +2,7 @@
 dir: apps/web/src/components/features/mobile
 
 ## role
-Provides mobile-optimized UI components for a responsive web application, covering navigation, lists, detail views, forms, modals, and specialized terminal interfaces.
+Provides a complete set of mobile-optimized UI components for core application patterns including navigation, lists, detail views, editing, modals, and specialized terminal interfaces.
 ## parent
 index: apps/web/src/components/features/.pi-map.index.md
 map: apps/web/src/components/features/.pi-map.md
@@ -18,6 +18,7 @@ map: apps/web/src/components/features/.pi-map.md
 - mobile-page-header.tsx
 - mobile-terminal-header.tsx
 - mobile-terminal-wrapper.tsx
+- spaces-bottom-sheet.tsx
 ## links
 index: apps/web/src/components/features/mobile/.pi-map.index.md
 map: apps/web/src/components/features/mobile/.pi-map.md