Remove accidental login/registration screen and auth code

[hhhthiti]

Motivation

• The project had an unintended login/registration screen and associated user/session logic which blocks direct access to the app UI and added unused complexity.

Description

• Removed the auth UI (#auth-screen) and user/logout UI from index.html so the app opens directly to #app-shell.
• Eliminated admin panel and role-protection markup (removed #admin-panel, promote-user, and role-protected usage) and simplified the MB51 tab to no longer depend on roles in index.html.
• Stripped authentication/session management from app.js by removing USERS_KEY, SESSION_KEY, user loading/saving, session handling, setupAuth/onAuthenticated/setupAdminPanel/applyRoleVisibility and related variables, and replaced startup with a simple initApp() that binds events and renders the app.
• Cleaned up auth-specific CSS in styles.css (removed .auth-* and .user-bar rules) while keeping the app styles intact.
• Files changed: index.html, app.js, styles.css.

Testing

• Ran node --check app.js to verify JavaScript syntax, and it succeeded.

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Codex Task

[vercel]

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Project	Deployment	Actions	Updated (UTC)
expedicao	Ready	Preview, Comment	Apr 22, 2026 9:05pm