fix(voz): frases desativadas em sequência deixavam fatias sobrando no corte

phrase_review_to_actions() cortava cada frase desativada isoladamente
(start..end da própria frase) — quando várias seguidas estavam desativadas,
a pausa ENTRE elas não pertencia a nenhuma frase e sobrevivia como um
clipe minúsculo (0,1-0,5s) na timeline final. Confirmado no projeto
Mastopexia real: 29 cuts individuais geravam mais de uma dezena de fatias
sub-segundo; agrupar frases desativadas consecutivas num único cut (do
início da primeira ao fim da última) reduziu para 3 cuts e 4 fatias
residuais (menores, provavelmente do padding do remove_media_silence —
registrado como dívida separada em 09_MANUTENCAO.md §2.5).

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

code/tests/test_phrase_review.py

@@ -260,6 +260,42 @@ class TestBackToActions:
         )
         assert result["actions"] == []
 
+    def test_consecutive_inactive_phrases_merge_into_one_cut(self):
+        """Two deactivated phrases in a row must not leave the pause between
+        them (2.0-2.3 here) uncut — a phrase-by-phrase cut would strand it as
+        a tiny surviving sliver clip in the final timeline."""
+        review = build_phrase_review(
+            _timeline([_segment(0, 2), _segment(2.3, 4), _segment(4.5, 6)])
+        )
+        review["phrases"][0]["active"] = False
+        review["phrases"][1]["active"] = False
+        result = phrase_review_to_actions(review)
+        cuts = [(a["start"], a["end"]) for a in result["actions"] if a["kind"] == "cut"]
+        assert cuts == [(0.0, 4.0)]
+
+    def test_inactive_run_at_the_end_still_flushes(self):
+        """A run of deactivated phrases with nothing active after it must
+        still produce its cut — regression for merging logic that only
+        flushed on hitting the next active phrase."""
+        review = build_phrase_review(_timeline([_segment(0, 2), _segment(2.3, 4)]))
+        review["phrases"][0]["active"] = False
+        review["phrases"][1]["active"] = False
+        result = phrase_review_to_actions(review)
+        cuts = [(a["start"], a["end"]) for a in result["actions"] if a["kind"] == "cut"]
+        assert cuts == [(0.0, 4.0)]
+
+    def test_isolated_inactive_phrases_stay_separate_cuts(self):
+        """An active phrase between two inactive ones must not be swallowed —
+        only truly CONSECUTIVE inactive phrases merge."""
+        review = build_phrase_review(
+            _timeline([_segment(0, 2), _segment(2.3, 4), _segment(4.5, 6)])
+        )
+        review["phrases"][0]["active"] = False
+        review["phrases"][2]["active"] = False
+        result = phrase_review_to_actions(review)
+        cuts = [(a["start"], a["end"]) for a in result["actions"] if a["kind"] == "cut"]
+        assert cuts == [(0.0, 2.0), (4.5, 6.0)]
+
 
 class TestManualZooms:
     def test_manual_zoom_becomes_an_action_without_a_scale(self):