feat: move sidebar account menu to settings button

[lsave]

Summary:

• move the sidebar account dropdown trigger from the user info block to the settings button while keeping the default footer layout unchanged
• add the account avatar and display name to the dropdown header, keep settings and logout actions in the menu, and use the Hugeicons logout glyph
• add a confirmation dialog before logging out and update the related sidebar copy in zh/en locales

Validation:

• pnpm exec tsc --noEmit --pretty false

[gemini-code-assist]

Code Review

This pull request updates the Sidebar component to enhance the user account and settings interface. Key changes include the introduction of a logout confirmation dialog, a redesigned account section that uses a dropdown menu for settings and logout actions, and updated internationalization strings for English and Chinese locales. I have no feedback to provide as no review comments were present.