Add native Picture-in-Picture support and debug ended event

Picture-in-Picture (PiP) improvements:
- Add native browser PiP button for videos (P key or 📺 button)
- PiP has true OS-level always-on-top when you right-click and select "Keep on top"
- PiP works on mobile and desktop with browser's native implementation
- Button shows on mobile (PiP is useful on mobile devices)
- Active state toggles button text between "📺 PiP" and "📺 Exit PiP"

Debug 'ended' event not firing:
- Add explicit ended event listener with console logging
- Log when media starts playing
- Log playback progress every 5 seconds
- This will help identify why auto-advance isn't working

The native PiP API provides better always-on-top than our window.focus()
approach because it's implemented at the OS level by the browser.

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

make_post_sell/static/js/player.js

@@ -381,6 +381,13 @@
           goToProductPage();
         }
         break;
+      case 'p':
+      case 'P':
+        e.preventDefault();
+        if (typeof togglePip === 'function') {
+          togglePip();
+        }
+        break;
     }
   }
 

make_post_sell/templates/player.j2

@@ -72,10 +72,8 @@
       }
 
       /* Hide desktop-only buttons on mobile */
-      #pipBtn,
       #autoResizeBtn,
-      #alwaysOnTopBtn,
-      #fullscreenBtn {
+      #alwaysOnTopBtn {
         display: none;
       }
 
@@ -231,8 +229,10 @@
 
         <!-- Row 2: Features -->
         <button id="alwaysOnTopBtn" onclick="toggleAlwaysOnTop()" title="Always on Top (T)">📌 On Top</button>
+        {% if media_type == 'video' %}
+        <button id="pipBtn" onclick="togglePip()" title="Picture-in-Picture (P) - Right-click PiP for true always-on-top">📺 PiP</button>
+        {% endif %}
         <button onclick="goToProductPage()" title="Go to Product Page (G)">🔗 Page</button>
-        <span></span><!-- Empty cell for grid alignment -->
 
         <!-- Row 3: More options -->
         <button id="autoResizeBtn" onclick="toggleAutoResize()" title="Auto-Resize Window (R)">↔ Resize</button>
@@ -260,6 +260,41 @@
       window.open(window.playerData.productUrl, '_blank');
     }
 
+    // Toggle native Picture-in-Picture (true always-on-top via browser)
+    function togglePip() {
+      const media = document.getElementById('media');
+      if (!media || media.tagName !== 'VIDEO') {
+        return;
+      }
+
+      if (document.pictureInPictureElement) {
+        document.exitPictureInPicture().catch(err => {
+          console.error('Failed to exit PiP:', err);
+        });
+      } else {
+        media.requestPictureInPicture().catch(err => {
+          console.error('Failed to enter PiP:', err);
+        });
+      }
+    }
+
+    // Update PiP button state
+    document.addEventListener('enterpictureinpicture', () => {
+      const pipBtn = document.getElementById('pipBtn');
+      if (pipBtn) {
+        pipBtn.classList.add('active');
+        pipBtn.textContent = '📺 Exit PiP';
+      }
+    });
+
+    document.addEventListener('leavepictureinpicture', () => {
+      const pipBtn = document.getElementById('pipBtn');
+      if (pipBtn) {
+        pipBtn.classList.remove('active');
+        pipBtn.textContent = '📺 PiP';
+      }
+    });
+
     // Mobile: tap to show/hide controls
     let hideTimeout;
     const isMobile = window.innerWidth <= 600;
@@ -314,17 +349,51 @@
       if (media && (media.tagName === 'VIDEO' || media.tagName === 'AUDIO')) {
         // Try to play muted first (allowed by most browsers)
         media.muted = true;
-        media.play().then(() => {
-          // Once playing, unmute after a short delay
-          setTimeout(() => {
-            media.muted = false;
-          }, 100);
-        }).catch(err => {
-          console.log('Autoplay failed:', err);
-          // User will need to tap play button
-        });
+        const playPromise = media.play();
+        if (playPromise !== undefined) {
+          playPromise.then(() => {
+            // Once playing, unmute after a short delay
+            setTimeout(() => {
+              media.muted = false;
+            }, 100);
+          }).catch(err => {
+            console.log('Autoplay failed:', err);
+            // User will need to tap play button
+          });
+        }
       }
     }
+
+    // Debug: Add ended event listener to verify it works
+    (function() {
+      const media = document.getElementById('media');
+      if (media && (media.tagName === 'VIDEO' || media.tagName === 'AUDIO')) {
+        media.addEventListener('ended', function() {
+          console.log('Media ended event fired!');
+          if (window.playerData && window.playerData.nextProductId) {
+            console.log('Navigating to next:', window.playerData.nextProductId);
+            window.location.href = '/player/' + window.playerData.nextProductId;
+          } else {
+            console.log('No next product available');
+          }
+        });
+
+        // Debug: Log when media is playing
+        media.addEventListener('play', function() {
+          console.log('Media started playing');
+        });
+
+        // Debug: Log time updates to verify playback
+        let lastLogTime = 0;
+        media.addEventListener('timeupdate', function() {
+          const currentTime = Math.floor(media.currentTime);
+          if (currentTime > lastLogTime && currentTime % 5 === 0) {
+            console.log('Playback at:', currentTime + 's / ' + Math.floor(media.duration) + 's');
+            lastLogTime = currentTime;
+          }
+        });
+      }
+    })();
   </script>
 </body>
 </html>