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!

media/edited_media/4k1_e_v1_metadata.json

@@ -0,0 +1,8 @@
+{
+  "time_of_modification": "2026-01-17T21:53:55.318456",
+  "original_name": "4k1.jpg",
+  "new_name": "4k1_e_v1.jpg",
+  "original_path": "/home/pi/Desktop/Kiwy-Signage/media/4k1.jpg",
+  "version": 1,
+  "user_card_data": "0007206239"
+}