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/web/.pi-map.md

@@ -4,7 +4,7 @@ dir: apps/web
 index: apps/web/.pi-map.index.md
 
 ## role
-Frontend web application for the headquarters system, providing a browser-based UI with code editing, terminal, and routing capabilities.
+Frontend web application providing a React-based UI with code editing, terminal, and routing capabilities for the "headquarter" project.
 ## files
 - .env.example | Template file defining example environment variables for frontend API and application URL configuration
 - .eslintrc.cjs | Configures ESLint for a TypeScript browser project with modern ECMAScript module support | dep: @typescript-eslint/parser, @typescript-eslint/eslint-plugin, eslint
@@ -16,7 +16,7 @@ Frontend web application for the headquarters system, providing a browser-based
 - tsconfig.json | TypeScript configuration file for a React project using Vite with modern ES2020 target and bundler module resolution | dep: typescript, react, vite
 - vite.config.ts | Configures Vite build tool for a React project with custom dev server port and Vitest test settings. | dep: vite, @vitejs/plugin-react
 ## arch
-Modern React SPA built with Vite and TypeScript, containerized with multi-stage Docker/nginx deployment, using ES modules with Vitest for testing.
+Modern React SPA built with Vite and TypeScript, containerized via multi-stage Docker with nginx serving, featuring client-side routing and optimized static asset delivery.
 ## tags
 react, eslint, vite, typescript, dom, application, nginx, web
 ## symbols