feat: add rich ui for converting

tests/test_cli.py

@@ -205,10 +205,12 @@ class TestCLI:
         """Test convert command with no papers."""
         self.run_paperlib_cmd("init", str(temp_library))
 
-        result = self.run_paperlib_cmd("convert", "--library", str(temp_library))
+        result = self.run_paperlib_cmd(
+            "convert", "--no-ui", "--library", str(temp_library)
+        )
 
         assert result.returncode == 0
-        assert "Complete: 0 successful, 0 failed" in result.stdout
+        assert "Converted pending: 0 successful, 0 failed" in result.stdout
 
     def test_convert_command_with_papers_no_mineru(self, temp_library, sample_pdf):
         """Test convert command with papers when MinerU is not available."""
@@ -218,11 +220,15 @@ class TestCLI:
             "import", "--pdf", str(sample_pdf), "--library", str(temp_library)
         )
 
-        # Convert (will fail because MinerU command may not be properly set up)
-        result = self.run_paperlib_cmd("convert", "--library", str(temp_library))
+        # Convert without UI (will fail because MinerU command may not be properly set up)
+        result = self.run_paperlib_cmd(
+            "convert", "--no-ui", "--library", str(temp_library)
+        )
 
         # Should complete but may have failures due to MinerU setup
-        assert "Complete:" in result.stdout
+        assert ("Converted pending:" in result.stdout) or (
+            "Converting papers" in result.stdout
+        )
 
     def test_invalid_command(self):
         """Test invalid command."""