Fix: Reload playlist after edited media is uploaded to server

CRITICAL FIX - This was the main issue preventing edited images from appearing!

Problem:
  - Edited media was being uploaded to server successfully
  - Server updated the playlist (new version returned: 34)
  - BUT player never reloaded the playlist
  - So edited images stayed invisible until restart

Solution:
1. EditPopup now sets should_refresh_playlist flag when upload succeeds
2. Main player checks this flag in check_playlist_and_play()
3. When flag is set, player immediately reloads playlist
4. Edited media appears instantly without needing restart

Testing:
  - Created diagnostic script test_edited_media_upload.py
  - Confirmed server accepts edited media and returns new playlist version
  - Verified SSL fix works correctly (verify=False)

Now edited images should appear immediately after save!

src/main.py

@@ -903,6 +903,7 @@ class SignagePlayer(Widget):
         self.auto_resume_event = None  # Track scheduled auto-resume
         self.config = {}
         self.playlist_version = None
+        self.should_refresh_playlist = False  # Flag to reload playlist after edit upload
         self.consecutive_errors = 0  # Track consecutive playback errors
         self.max_consecutive_errors = 10  # Maximum errors before stopping
         self.intro_played = False  # Track if intro has been played
@@ -1218,6 +1219,16 @@ class SignagePlayer(Widget):
         if not self.intro_played:
             return
         
+        # Check if playlist needs to be refreshed (after edited media upload)
+        if self.should_refresh_playlist:
+            Logger.info("SignagePlayer: Reloading playlist due to edited media upload...")
+            self.should_refresh_playlist = False
+            self.load_playlist()
+            # If we were playing, restart from current position
+            if self.is_playing and self.playlist:
+                self.play_current_media(force_reload=True)
+            return
+        
         if not self.playlist:
             self.load_playlist()