style: shorten header copy

src/server/request-handler.ts

@@ -781,10 +781,10 @@ function htmlPage(): string {
     <header>
       <div class="brand">
         <h1>mapy-mg</h1>
-        <p>Load photos, read EXIF locally in the browser, and show them on OpenStreetMap.</p>
+        <p>Browser-based photo geolocation on OpenStreetMap.</p>
       </div>
       <div class="header-actions">
-        <div class="meta">Client-side import · no image storage on the server</div>
+        <div class="meta">Client-side processing, no server-side storage</div>
         <button class="secondary theme-toggle" id="theme-toggle" type="button" aria-label="Switch color theme">
           <span class="button-icon" id="theme-toggle-icon" aria-hidden="true">
             <svg viewBox="0 0 16 16" fill="none" xmlns="http://www.w3.org/2000/svg">