fix: put Sessions back in the middle of nav on desktop and mobile

- Reorder desktop sidebar so Sessions sits between spaces/tools groups:
  Home, Projects, Workspaces, Sessions, Tool Workshop, Config Profiles, Settings.
- Reorder mobile bottom nav so Sessions is the center item:
  Home, Spaces, Sessions, Tools, Settings.
- Workspace cards already display the owning project name; no extra change needed.

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

apps/.pi-map.md

@@ -4,10 +4,10 @@ dir: apps
 index: apps/.pi-map.index.md
 
 ## role
-Contains the main executable application modules that serve as entry points for the project.
+Container directory for independent application modules or deployable units within the project.
 ## files
 ## arch
-Modular application structure with separate deployable units, likely following microservices or layered architecture patterns with domain-driven design boundaries.
+Monorepo-style organization where each subdirectory represents a self-contained application sharing common infrastructure or libraries.
 ## tags
 -
 ## symbols