fix: hide page title on mobile Profile view

The mobile profile form already renders its own header via
ProfileMobileView, so the desktop page title was redundant on small
viewports.

Quality gates: npm run typecheck, npm run lint

Refs: openspec/changes/mobile-tool-profile-ui

apps/web/.pi-map.md

@@ -4,7 +4,7 @@ dir: apps/web
 index: apps/web/.pi-map.index.md
 
 ## role
-Frontend web application providing the user-facing interface for the "headquarter" project, built as a modern React SPA with code editing, terminal, and routing capabilities.
+Frontend web application for a React-based developer workspace with code editing, terminal, and routing capabilities.
 ## 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 providing the user-facing interface for the "headquarte
 - 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 architecture using Vite for build tooling, TypeScript for type safety, nginx for static serving with SPA routing support, and Docker multi-stage builds for containerized deployment with non-root security.
+Modern Vite-based SPA with TypeScript, nginx reverse proxy serving, multi-stage Docker containerization, and client-side routing.
 ## tags
 react, eslint, vite, typescript, dom, application, nginx, web
 ## symbols