polish: configurator visual redesign + copy cleanup

- Redesigned progress bar: numbered circles with connectors, checkmarks on completion,
  line only fills up to current step, centered layout
- Redesigned service cards: horizontal 3-column grid, border-based selection state,
  check badges, staggered entrance animations
- Fixed card border clipping (ring → border)
- Fixed height stability (selection hint stays in DOM)
- Removed all em dashes, replaced with regular dashes
- Removed all Côte d'Azur / Riviera / France location references sitewide
- Philosophy quote attributed to "Matt Ciaccio, Founder"
- Footer: "American-founded. Serving clients worldwide."
- Email template: LetsBe Solutions LLC
- AI prompt: removed Côte d'Azur reference

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/lib/email.ts

@@ -55,7 +55,7 @@ export async function sendBriefToClient({ to, name, brief }: SendBriefEmailOptio
           </p>
         </div>
         <div style="border-top:1px solid #e5e7eb;padding:24px 0;font-size:12px;color:#999;text-align:center">
-          LetsBe. Digital Studio · Côte d'Azur, France
+          LetsBe Solutions LLC
         </div>
       </div>
     `,