Improve console suppression for windowed mode on Windows

Refactored console window suppression logic to better handle PyInstaller windowed applications and prevent console flicker. Added creation flags and redirected subprocess streams in multiple modules to ensure hidden console windows when running subprocesses. Introduced a utility function for running subprocesses with hidden console and updated all relevant subprocess calls to use it.

src/core/ytsage_yt_dlp.py

@@ -1,6 +1,7 @@
 import os
 import shutil
 import subprocess
+import sys
 from pathlib import Path
 from typing import Optional
 
@@ -500,10 +501,22 @@ def check_ytdlp_binary() -> Optional[Path]:
         # Use subprocess to check if yt-dlp is available
         if OS_NAME == "Windows":
             # On Windows, use 'where' command and hide console window
-            # Extra logic moved to src\utils\ytsage_constants.py
+            # For windowed applications, use additional flags to prevent console window flicker
+            creation_flags = SUBPROCESS_CREATIONFLAGS
+            if getattr(sys, 'frozen', False):
+                # Running as compiled executable - use additional flags
+                creation_flags |= subprocess.CREATE_NEW_PROCESS_GROUP | subprocess.DETACHED_PROCESS
 
             result = subprocess.run(
-                ["where", "yt-dlp"], capture_output=True, text=True, check=False, creationflags=SUBPROCESS_CREATIONFLAGS
+                ["where", "yt-dlp"], 
+                capture_output=True, 
+                text=True, 
+                check=False, 
+                creationflags=creation_flags,
+                # Additional parameters to suppress console
+                stdin=subprocess.DEVNULL,
+                stdout=subprocess.PIPE,
+                stderr=subprocess.PIPE
             )
             if result.returncode == 0 and result.stdout.strip():
                 yt_dlp_path = result.stdout.strip().split("\n")[0]
@@ -534,9 +547,22 @@ def check_ytdlp_installed() -> bool:
         if ytdlp_path:
             # Try to run yt-dlp --version to verify it's working
             try:
-                # Extra logic moved to src\utils\ytsage_constants.py
+                # For windowed applications, use additional flags to prevent console window flicker
+                creation_flags = SUBPROCESS_CREATIONFLAGS
+                if getattr(sys, 'frozen', False):
+                    # Running as compiled executable - use additional flags
+                    creation_flags |= subprocess.CREATE_NEW_PROCESS_GROUP | subprocess.DETACHED_PROCESS
+
                 result = subprocess.run(
-                    [ytdlp_path, "--version"], capture_output=True, text=True, timeout=5, creationflags=SUBPROCESS_CREATIONFLAGS
+                    [ytdlp_path, "--version"], 
+                    capture_output=True, 
+                    text=True, 
+                    timeout=5, 
+                    creationflags=creation_flags,
+                    # Additional parameters to suppress console
+                    stdin=subprocess.DEVNULL,
+                    stdout=subprocess.PIPE,
+                    stderr=subprocess.PIPE
                 )
                 return result.returncode == 0
             except Exception: