Fix decode progress - pass progress_file to library

Worker was writing 25% then calling decode() without progress_file,
so library couldn't update progress. Now passes progress_file through
so library's extraction/RS-decode progress updates work.

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

frontends/web/stego_worker.py

@@ -171,8 +171,7 @@ def decode_operation(params: dict) -> dict:
     # Resolve channel key (v4.0.0)
     resolved_channel_key = _resolve_channel_key(params.get("channel_key", "auto"))
 
-    _write_decode_progress(progress_file, 25, "extracting")
+    # Library handles progress internally via progress_file parameter
-
     # Call decode with correct parameter names
     result = decode(
         stego_image=stego_data,
@@ -183,9 +182,9 @@ def decode_operation(params: dict) -> dict:
         rsa_password=params.get("rsa_password"),
         embed_mode=params.get("embed_mode", "auto"),
         channel_key=resolved_channel_key,  # v4.0.0
+        progress_file=progress_file,  # v4.2.0: pass through for real-time progress
     )
-
+    # Library writes 100% "complete" - no need for worker to write again
-    _write_decode_progress(progress_file, 90, "finalizing")
 
     if result.is_file:
         return {

test_data/phonebooth.pem

@@ -0,0 +1,30 @@
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+mOcTA23IguMFuU/jGYp04cGT+gE4X+7CzA==
+-----END ENCRYPTED PRIVATE KEY-----