Restyle site to match flowautomate.ai design system

Replace Navy (#1B3A5C) / Gold (#C9A94E) with flowautomate.ai's
red (#FF1F1F) / dark neutral (#171717, #262626) theme. Add Inter +
Poppins Google Fonts, update logo, email templates, and CSP headers.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

public/index.html

@@ -129,7 +129,7 @@
       </a>
       <div class="header__right">
         <a href="tel:+14256107779" class="header__phone">
-          <svg xmlns="http://www.w3.org/2000/svg" width="16" height="16" viewBox="0 0 24 24" fill="#C9A94E" style="vertical-align:-3px;margin-right:4px;"><path d="M6.62 10.79a15.05 15.05 0 006.59 6.59l2.2-2.2a1 1 0 011.01-.24c1.12.37 2.33.57 3.58.57a1 1 0 011 1V20a1 1 0 01-1 1A17 17 0 013 4a1 1 0 011-1h3.5a1 1 0 011 1c0 1.25.2 2.46.57 3.58a1 1 0 01-.24 1.01l-2.21 2.2z"/></svg>
+          <svg xmlns="http://www.w3.org/2000/svg" width="16" height="16" viewBox="0 0 24 24" fill="#FF1F1F" style="vertical-align:-3px;margin-right:4px;"><path d="M6.62 10.79a15.05 15.05 0 006.59 6.59l2.2-2.2a1 1 0 011.01-.24c1.12.37 2.33.57 3.58.57a1 1 0 011 1V20a1 1 0 01-1 1A17 17 0 013 4a1 1 0 011-1h3.5a1 1 0 011 1c0 1.25.2 2.46.57 3.58a1 1 0 01-.24 1.01l-2.21 2.2z"/></svg>
           (425) 610-7779
         </a>
         <a href="#lead-form-section" class="btn">Get My Cash Offer</a>
@@ -329,7 +329,7 @@
   </section>
 
   <!-- Situations -->
-  <section class="section section--navy situations">
+  <section class="section section--dark situations">
     <div class="container">
       <h2>Situations We Help With</h2>
       <p>No matter what you're going through, we can offer a fast, fair solution.</p>
@@ -495,7 +495,7 @@
   </section>
 
   <!-- Final CTA -->
-  <section class="section section--navy cta-banner">
+  <section class="section section--dark cta-banner">
     <div class="container">
       <h2>Ready to Get Your Cash Offer?</h2>
       <p>Fill out the form or call us now. No obligation, no pressure.</p>