feat: broaden H1 + Google login on pricing + lifetime urgency #4753

Originally written by @ccantynz-alt on GitHub.
Imported from https://github.com/ccantynz-alt/voxlen/pull/48

Summary

• H1 broadened — "Dictate anything. Perfectly." replaces "Voice Dictation Built for Lawyers & Accountants." Subheadline now says "Loved by lawyers, accountants, doctors, and executives" — keeps targeting without blocking everyone else at the door.
• Pricing CTAs require Google sign-in — clicking any paid plan button when not signed in now triggers Google OAuth first. Button label shows "Sign in to Get Started" for unauthenticated visitors.
• Lifetime plan urgency — tagline changed to "Early bird offer — limited time", added "Price increases after launch" feature line.

Test plan

• Landing page H1 reads "Dictate anything. Perfectly."
• Click "Get Pro" without being signed in → Google sign-in popup appears
• Lifetime plan card shows "Early bird offer — limited time" and urgency line
• Signed-in users still proceed to checkout/download as before

https://claude.ai/code/session_011MFNHeFKrhfuSrEYVgrdyr

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