Smaller Improvements

A few smaller changes across the platform:

• Unsaved dashboard changes show in a bar that floats at the bottom of the page, with Reset and Save as new always in reach.
• The new dashboard dialog shows a preview of each template's layout before you pick one.
• The main dashboard shows your top cited LinkedIn posts.
• Video cards in Google AI Overviews and AI Mode answers open in the YouTube sheet, at the moment the answer points to.
• The responses export lists each brand mention with its position in the answer, like Acme (1), Globex (2).
• Locked features show a preview with sample data, so you can see what you'd get before you upgrade.
• Bar charts have a new gradient style.
• The pricing page shows annual plans as a monthly price, billed yearly, and the plan you pick carries over into signup and onboarding.