Feat: Add Status Bar with Progress Bar for Load on Save operations

src/teletext/io.py

@@ -1,10 +1,15 @@
 import os
-from typing import List
+from typing import List, Callable, Optional
 from .models import Packet, Page, TeletextService
 
-def load_t42(file_path: str) -> TeletextService:
+def load_t42(file_path: str, progress_callback: Optional[Callable[[int, int], None]] = None) -> TeletextService:
     service = TeletextService()
     
+    total_bytes = os.path.getsize(file_path)
+    # Each packet is 42 bytes
+    total_packets = total_bytes // 42
+    processed_packets = 0
+    
     with open(file_path, 'rb') as f:
         while True:
             chunk = f.read(42)
@@ -13,6 +18,10 @@ def load_t42(file_path: str) -> TeletextService:
             if len(chunk) < 42:
                 # Should not happen in a valid T42 stream, or we just ignore incomplete tail
                 break
+            
+            processed_packets += 1
+            if progress_callback and processed_packets % 100 == 0:
+                progress_callback(processed_packets, total_packets)
                 
             packet = Packet(chunk)
             service.all_packets.append(packet)
@@ -114,9 +123,16 @@ def decode_packet_header(b1, b2):
     row = (d2 << 1) | ((d1 >> 3) & 1)
     return mag, row
 
-def save_t42(file_path: str, service: TeletextService):
+def save_t42(file_path: str, service: TeletextService, progress_callback: Optional[Callable[[int, int], None]] = None):
+    total_packets = len(service.all_packets)
+    processed = 0
+    
     with open(file_path, 'wb') as f:
         for packet in service.all_packets:
+            processed += 1
+            if progress_callback and processed % 100 == 0:
+                progress_callback(processed, total_packets)
+
             # Check if we can reuse the original header (preserving parity/integrity)
             use_original_header = False