Center native highlight captions by line anchor

src/humeo/cutter.py

@@ -513,19 +513,16 @@ def _format_native_highlight_ass(
         cue_start = cue_windows[0][0] if cue_windows else cue_words[0].start_time
         cue_end = cue_windows[-1][1] if cue_windows else cue_words[-1].end_time
         word_offset = 0
+        line_center_x = play_res_x / 2.0
         for line_idx, line_words in enumerate(lines):
             if not line_words:
                 continue
             line_text = " ".join(word.word for word in line_words)
             line_top = block_top + line_idx * (line_height + line_gap)
-            line_width = _text_width(font, line_text)
-            centered_left = (play_res_x - line_width) / 2.0
-            max_left = play_res_x - safe_margin_x - line_width
-            line_left = max(float(safe_margin_x), min(centered_left, max_left))
             events.append(
                 "Dialogue: 1,"
                 f"{_fmt_ass_time(cue_start)},{_fmt_ass_time(cue_end)},Base,,0,0,0,,"
-                f"{{\\an7\\pos({line_left:.1f},{line_top:.1f})}}{_escape_ass_text(line_text)}"
+                f"{{\\an8\\pos({line_center_x:.1f},{line_top:.1f})}}{_escape_ass_text(line_text)}"
             )
             for word_idx, word in enumerate(line_words):
                 cleaned = _clean_native_highlight_token(word.word)
@@ -535,7 +532,7 @@ def _format_native_highlight_ass(
                 events.append(
                     "Dialogue: 0,"
                     f"{_fmt_ass_time(word_start)},{_fmt_ass_time(word_end)},Invisible,,0,0,0,,"
-                    f"{{\\an7\\pos({line_left:.1f},{line_top:.1f})}}"
+                    f"{{\\an8\\pos({line_center_x:.1f},{line_top:.1f})}}"
                     f"{_native_highlight_overlay_text(line_words, word_idx)}"
                 )
             word_offset += len(line_words)