Radio show website: light mode fix, headshot, motto update

- Fix hero title/tagline/description text invisible in light mode
- Replace ghost button with accent-bordered outline button for contrast
- Add [data-theme="light"] overrides for hero gradients
- Add Mike Swanson headshot (WebP 11KB + JPEG fallback) to about page and home
- Replace SVG placeholders with real photo (circular crop on about, framed on home)
- Update show motto across all locations

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

projects/radio-show/website/src/layouts/BaseLayout.astro

@@ -8,7 +8,7 @@ interface Props {
   image?: string;
 }
 
-const { title, description = 'The Computer Guru Show - Technology: Fun and Simple', image = '/og-image.jpg' } = Astro.props;
+const { title, description = 'The Computer Guru Show - Helping you deal with all of your technology needs while treating you like a person in the process.', image = '/og-image.jpg' } = Astro.props;
 const canonicalURL = new URL(Astro.url.pathname, Astro.site);
 ---
 
@@ -97,7 +97,7 @@ const canonicalURL = new URL(Astro.url.pathname, Astro.site);
       <div class="footer-grid">
         <div class="footer-brand">
           <span class="logo-text">The Computer Guru Show</span>
-          <p>Technology: Fun and Simple</p>
+          <p>Helping you deal with all of your technology needs while treating you like a person in the process.</p>
           <p class="footer-location">Tucson, Arizona</p>
         </div>
         <div class="footer-links">