Onboarding: rely on https cookie redirect, remove DietPi mentions

pikit-web/onboarding/index.html

@@ -21,7 +21,7 @@
 
       <div class="badges">
         <span class="badge"><span class="dot"></span> Local-only traffic</span>
-        <span class="badge"><span class="dot"></span> Works for Pi-Kit & DietPi dashboards</span>
+        <span class="badge"><span class="dot"></span> Covers the Pi-Kit dashboard</span>
         <span class="badge"><span class="dot"></span> HTTPS ready once trusted</span>
       </div>
 
@@ -35,7 +35,7 @@
       <section class="steps">
         <h3>Why switch to HTTPS?</h3>
         <ul>
-          <li>Encrypts traffic on your LAN so no one can snoop your Pi-Kit or DietPi dashboards.</li>
+          <li>Encrypts traffic on your LAN so no one can snoop your Pi-Kit dashboard.</li>
           <li>Stops mixed-content / “not secure” browser warnings.</li>
           <li>Needed for some browser features (clipboard, notifications, service workers).</li>
         </ul>
@@ -52,7 +52,7 @@
 
       <section class="steps">
         <h3>Install the Pi-Kit CA (recommended, one-time)</h3>
-        <p>This removes future warnings for both Pi-Kit and DietPi dashboards.</p>
+        <p>This removes future warnings for the Pi-Kit dashboard.</p>
         <details>
           <summary>Windows</summary>
           <p>Run <strong>mmc</strong> → Add/Remove Snap-in → Certificates (Computer) → Trusted Root CAs → Import <em>pikit-ca.crt</em>.</p>
@@ -89,18 +89,7 @@
     <script>
       (function () {
         const target = `https://${location.hostname}`;
-        const log = (m) => console.log("[pikit onboarding]", m);
-
-        async function probe() {
-          try {
-            await fetch(`${target}/api/status`, { mode: "no-cors", cache: "no-store" });
-            log("HTTPS reachable, redirecting");
-            document.cookie = "pikit_https_ok=1; Path=/; Max-Age=2592000; SameSite=Lax";
-            window.location = target;
-          } catch (e) {
-            log("HTTPS probe failed; staying on onboarding page");
-          }
-        }
+        const hasCookie = document.cookie.includes("pikit_https_ok=1");
 
         document.getElementById("continueBtn").addEventListener("click", () => {
           window.location = target;
@@ -144,7 +133,9 @@
           });
         });
 
-        probe();
+        if (hasCookie) {
+          window.location = target;
+        }
       })();
     </script>
   </body>