docs(marketing): Revise beta flyer feature descriptions for clarity and detail

Updated the feature descriptions to enhance clarity, including separating passwordless login and end-to-end encryption, and specifying GPS track upload with map representation. Added new feature for photo attachments for skipper and crew. Updated the corresponding PDF to reflect these changes.

docs/marketing/beta-flyer.html

@@ -250,9 +250,12 @@
     <section class="features" aria-label="Funktionen">
       <div class="feature"><span class="feature-icon">✦</span><span>Reisetage im nautischen Logbuch-Format (Hafen, Wetter, Besegelung, Crew, Tankstände, etc.)</span></div>
       <div class="feature"><span class="feature-icon">✦</span><span>Offline-fähige PWA — läuft auf jedem Smartphone &amp; Tablet</span></div>
-      <div class="feature"><span class="feature-icon">✦</span><span>Passwortlose Passkey-Anmeldung &amp; Ende-zu-Ende Verschlüsselung</span></div>
+      <div class="feature"><span class="feature-icon">✦</span><span>Einfache passwortlose Passkey-Anmeldung</span></div>
-      <div class="feature"><span class="feature-icon">✦</span><span>GPS-Track Upload (GPX/KML), Karte &amp; Streckenstatistik</span></div>
+      <div class="feature"><span class="feature-icon">✦</span><span>Ende-zu-Ende Verschlüsselung</span></div>
+      <div class="feature"><span class="feature-icon">✦</span><span>GPS-Track Upload (GPX/KML) mit Kartendarstellung</span></div>
+      <div class="feature"><span class="feature-icon">✦</span><span>Streckenstatistik</span></div>
       <div class="feature"><span class="feature-icon">✦</span><span>Foto-Anhänge pro Reisetag</span></div>
+      <div class="feature"><span class="feature-icon">✦</span><span>Foto-Anhänge für Skipper und Crew</span></div>
       <div class="feature"><span class="feature-icon">✦</span><span>Crew einladen — gemeinsam am Logbuch arbeiten</span></div>
       <div class="feature"><span class="feature-icon">✦</span><span>PDF- &amp; CSV-Export</span></div>
       <div class="feature"><span class="feature-icon">✦</span><span>Verschlüsseltes Backup &amp; Wiederherstellung</span></div>