fix: keep file name visible on progress sub-line during indexing

progress_update() and FileProcessingContext.__exit__() were both
clearing _progress_file, causing the current file name to disappear
almost immediately — especially in parallel mode where one worker
finishing would wipe the display for all active workers.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: Chetic

src/chunksilo/index.py

@@ -985,9 +985,6 @@ def progress_update(self, step: int = 1) -> None:
             if not self._progress_active or self._progress_total <= 0:
                 return
             self._progress_current = min(self._progress_total, self._progress_current + step)
-            self._progress_file = ""
-            self._progress_phase = ""
-            self._progress_heartbeat = ""
             self._render_progress()
 
     def progress_set_file(self, file_path: str, phase: str = "") -> None:
@@ -1319,9 +1316,6 @@ def __exit__(self, exc_type, exc_val, exc_tb):
                     f"Slow file processing: {self.file_path} took {duration:.1f}s"
                 )
 
-        # Clear file indicator
-        self.ui.progress_set_file("", "")
-
         # Don't suppress exceptions
         return False
 

test/test_indexing_ui.py

@@ -139,6 +139,14 @@ def test_progress_set_heartbeat(self, ui):
         output = _output(ui)
         assert "⠹" in output
 
+    def test_progress_update_preserves_file(self, ui):
+        """progress_update does not clear the current file sub-line."""
+        ui.progress_start(10)
+        ui.progress_set_file("/path/to/report.pdf", "Loading")
+        ui.progress_update(1)
+        output = _output(ui)
+        assert "report.pdf" in output
+
     def test_progress_done_completes(self, ui):
         """progress_done exits progress mode cleanly."""
         ui.progress_start(2)