Refreshed website and file attachments in research

• New workspace configuration step in the welcome wizard, with team size now optional in account settings.
• Email consent controls in your profile and welcome flow, plus an unsubscribe link in onboarding emails.
• Attachments support in research creation and new analysis sessions.
• Refreshed website with a new pricing page, centered solutions design, blog in the header menu, and gradient hero sections.

• Fade-in outline animation, redesigned highlight cards with repositioned tags, and template badges with dark mode support.
• Mobile menu now keeps the solutions list persistent, and the website footer has a cleaner layout.
• Research pages gained use case badges, a "Watch a Demo" button, and a responsive "Talk to Us" button.

Fixed website rendering issues and signup redirect problems.