fix(installer): stabilize ISCC script and output decoding

- remove fragile preprocessor icon block in .iss

- decode ISCC stdout/stderr with cp1251/cp866 fallbacks for readable diagnostics

build.py

@@ -170,6 +170,19 @@ def _find_iscc():
     return ""
 
 
+def _decode_process_output(raw_bytes):
+    if raw_bytes is None:
+        return ""
+    if isinstance(raw_bytes, str):
+        return raw_bytes
+    for enc in ("utf-8", "cp1251", "cp866"):
+        try:
+            return raw_bytes.decode(enc)
+        except Exception:
+            continue
+    return raw_bytes.decode("utf-8", errors="replace")
+
+
 def build_installer():
     print(f"\n--- 4. Создание установщика {INSTALLER_NAME} ---")
     if os.name != "nt":
@@ -200,15 +213,14 @@ def build_installer():
         completed = subprocess.run(
             command,
             capture_output=True,
-            text=True,
-            encoding="utf-8",
-            errors="replace",
             check=False,
         )
-        if completed.stdout:
-            print(completed.stdout.rstrip())
-        if completed.stderr:
-            print(completed.stderr.rstrip())
+        stdout_text = _decode_process_output(completed.stdout)
+        stderr_text = _decode_process_output(completed.stderr)
+        if stdout_text:
+            print(stdout_text.rstrip())
+        if stderr_text:
+            print(stderr_text.rstrip())
         if completed.returncode != 0:
             raise RuntimeError(f"ISCC exited with code {completed.returncode}")
         installer_path = os.path.join("dist", INSTALLER_NAME)

installer/AnabasisManager.iss

@@ -28,9 +28,7 @@ SolidCompression=yes
 WizardStyle=modern
 ArchitecturesInstallIn64BitMode=x64compatible
 UninstallDisplayIcon={app}\AnabasisManager.exe
-#ifexist MyIconFile
 SetupIconFile={#MyIconFile}
-#endif
 
 [Languages]
 Name: "russian"; MessagesFile: "compiler:Languages\Russian.isl"