Redesigned _email_wrap(): lowercase wordmark header matching website,
3px blue accent border, preheader text support, HR separators.
_email_button() now full-width block for mobile tap targets.
Rewrote copy: improved subject lines, urgency cues, quick-start links
in welcome, styled project recap in quote verify, heat badges on lead
forward, "what happens next" in lead matched, secondary CTAs.
~30 new/updated translation keys in both EN and DE.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>