[hzwllm]

Functional changes

• Removed the shared top and bottom bars. Moved version information, GitHub, ModelEngine, terms, copyright, and the eligible monitoring link into the sidebar account menu.
• Updated account menu dimensions, spacing, and colors while retaining the existing font family. Added a language submenu with the current language marked; appearance settings were not added.
• Changed the collapsed sidebar to show icons only. Hovering expands it from 64px to 240px, overlaying the content without shifting the page.
• Aligned icons and labels horizontally, including the logo and product name. Long labels are truncated and display their full text on hover.
• Kept the sidebar expanded while account or notification popups are open. Added delayed collapse to prevent accidental closing during interaction.
• Fixed unsolicited /users requests by disabling profile link prefetch and using the localized route. Explicit click navigation remains available.
• Preserved existing permissions, visibility rules, authentication actions, and logout confirmation. No backend changes were made.
  Test coverage
• 35 frontend unit tests passed, covering hover expansion, delayed collapse, re-entry, keyboard focus, popup handling, timer cleanup, account states, link visibility, language switching, logout confirmation, and monitoring access.
• 4 formal D1 tests passed, covering menu permissions, authentication states, routing, and Chinese/English menu ordering.
• Formal D4 browser regression passed, covering actual dimensions, unchanged content position, horizontal alignment, truncation tooltips, popup behavior, language switching, and narrow-screen boundaries.
• Before the fix, the request regression detected 4 unsolicited profile requests. After the fix, three account popup open/close cycles produced 0 profile requests, while clicking the profile link navigated successfully.
• TypeScript checks, scoped ESLint and Prettier checks, formal test asset validation, and the production image build passed.