fix(dasha): measure nakshatra index and progress on one grid

Upstream 3c2dad95, 8643bc9a, and the lon_to_nakshatra part of 9e04f0db. Exact star starts were split across int-division and modulo, so 16 of 27 openings reported a zero balance and skipped the mahadasha. Off-boundary longitudes keep the old modulo. BUG-1381.

Co-Authored-By: Grok (agent loop)
Co-authored-by: Cursor <cursoragent@cursor.com>

scripts/dasha_analyzer.py

@@ -68,12 +68,18 @@ def fuzzy_match_nakshatra(name):
     return None
 
 def lon_to_nakshatra(moon_lon):
-    """月亮黄经（0-360）→ Nakshatra + Pada"""
-    nak_span = 360 / 27
-    pada_span = nak_span / 4
-    idx = int(moon_lon / nak_span)
-    progress = (moon_lon % nak_span) / nak_span
-    pada = int((moon_lon % nak_span) / pada_span) + 1
+    """月亮黄经（0-360）→ Nakshatra + Pada。序号与进度来自同一把尺子。"""
+    try:
+        from nakshatra_advanced import nakshatra_index_and_progress
+    except ImportError:
+        from scripts.nakshatra_advanced import nakshatra_index_and_progress
+    idx, progress = nakshatra_index_and_progress(moon_lon)
+    if progress == 0.0:
+        pada = 1
+    else:
+        nak_span = 360 / 27
+        pada_span = nak_span / 4
+        pada = int((float(moon_lon) % nak_span) / pada_span) + 1
     return NAKSHATRA_LIST[idx], progress, pada
 
 def build_dasha_timeline(birth_date_str, nak_info, nak_progress):