Participants can join interviews without signing up

• Anonymous access is now the default mode, so participants can jump in without signing up.
• Auto-generated welcome messages greet users at the start of every conversation.
• Share with teammates from the settings sidebar, plus easier public page sharing from list view.

• Major UI refresh for more consistent styling and better accessibility across buttons, inputs, dialogs, and dropdowns.
• Scroll mode is now the default in conversation chat, with smoother animations and a refreshed welcome screen.
• Renamed "Perspectives" to "Home" and simplified the homepage layout.
• Default credit allowance increased to 250 with an updated pricing page.

Resolved conversation assistant scroll positioning, mobile card layouts, confetti in scroll mode, and various hover and toggle button glitches.