feat(filters): upgrade markdown-normalizer to v1.2.7

- Fix Issue #49: resolve greedy regex matching in consecutive emphasis
- Add LaTeX formula protection to prevent corruption of \times, \nu, etc.
- Expand i18n support to 12 languages with strict alignment
- Fix NameError in Request import during testing

plugins/debug/test_latex_fix.py

@@ -0,0 +1,44 @@
+import sys
+import os
+
+# Add plugin dir to path
+current_dir = os.path.dirname(os.path.abspath(__file__))
+plugin_dir = os.path.abspath(os.path.join(current_dir, "..", "filters", "markdown_normalizer"))
+sys.path.append(plugin_dir)
+
+from markdown_normalizer import ContentNormalizer, NormalizerConfig
+
+def test_latex_protection():
+    # Test case 1: The reported issue with \times
+    content_1 = r"Calculation: $C(33, 6) \times C(16, 1)$"
+    
+    config = NormalizerConfig(enable_escape_fix=True)
+    normalizer = ContentNormalizer(config)
+    
+    result_1 = normalizer.normalize(content_1)
+    
+    print("--- Test 1: \times Protection ---")
+    print(f"Input:  {content_1}")
+    print(f"Output: {result_1}")
+    
+    if r"\times" in result_1:
+        print("✅ PASSED")
+    else:
+        print("❌ FAILED")
+
+    # Test case 2: Other potential collisions like \nu (newline) or \theta (tab?)
+    # Using raw strings carefully
+    content_2 = r"Formula: $\theta = \nu + \tau$"
+    result_2 = normalizer.normalize(content_2)
+    
+    print("\n--- Test 2: \theta and \nu Protection ---")
+    print(f"Input:  {content_2}")
+    print(f"Output: {result_2}")
+    
+    if r"\theta" in result_2 and r"\nu" in result_2:
+        print("✅ PASSED")
+    else:
+        print("❌ FAILED")
+
+if __name__ == "__main__":
+    test_latex_protection()