test(ui): address report fence review feedback

Author: elkaix

src/pythinker_code/ui/shell/visualize/_blocks.py

@@ -162,7 +162,7 @@ def _find_committed_boundary(text: str) -> int | None:
 
 def _starts_with_report_fence(text: str) -> bool:
     stripped = text.lstrip().casefold()
-    return stripped.startswith("```report") or stripped.startswith("~~~report")
+    return stripped.startswith(("```report", "~~~report"))
 
 
 def _tail_lines(text: str, n: int) -> str:

tests/ui_and_conv/test_streaming_content_block.py

@@ -335,12 +335,8 @@ def test_composing_commits_on_newline(self):
         pending = block.raw_text[block._committed_len :]
         assert "Third." in pending
 
-    def test_report_fence_continuation_keeps_gap_after_streamed_prose(self, monkeypatch):
-        from importlib import import_module
-
-        blocks_module = import_module("pythinker_code.ui.shell.visualize._blocks")
+    def test_report_fence_continuation_keeps_gap_after_streamed_prose(self):
         output_console = Console(record=True, width=100, color_system=None)
-        monkeypatch.setattr(blocks_module, "console", output_console)
 
         block = _ContentBlock(is_think=False)
         block.append("Deep scan completed. Full report saved here:\n")
@@ -349,8 +345,8 @@ def test_report_fence_continuation_keeps_gap_after_streamed_prose(self, monkeypa
         output_console.print(block.compose_final())
         output = output_console.export_text()
 
-        assert "Deep scan completed" in output
-        assert "\n\n  ╭─ Deep Code Scan Results" in output
+        assert output.startswith("\n")
+        assert "Deep Code Scan Results" in output
 
     def test_composing_no_commit_without_newline(self):
         block = _ContentBlock(is_think=False)