[alcounit]

Optional user authentication for browser-ui — #10

browser-ui can now optionally require users to sign in. Authentication is off by default, so nothing changes unless it's turned on.

• Users sign in with a username and password and stay signed in via a session cookie; there's a matching sign-out.
• When authentication is on, the dashboard and its data are protected — you have to be signed in to use them.
• Each user only sees and manages their own browser sessions; other users' sessions are hidden.

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VNC session UX: password handling and clipboard sync — #11

Makes opening password-protected VNC sessions smoother and lets users move text between their machine and the remote browser.

• Remembers VNC passwords and tries them automatically, so a saved session connects without asking again.
• If a password doesn't work, it quietly tries the other known ones before asking, and warns if you re-enter one that already failed.
• After you type a working password, it offers to save it — either for that browser or for that specific version.
• Copy and paste text both ways between your clipboard and the remote browser, with a brief on-screen confirmation.