feat: Implement unsupported character handling in Supertonic pipeline and add related tests

tests/test_manual_overrides_applied_first.py

@@ -0,0 +1,51 @@
+from abogen.web import conversion_runner
+
+
+class DummyJob:
+    def __init__(self):
+        self.language = "en"
+        self.voice = "M1"
+        self.speakers = None
+        self.manual_overrides = []
+        self.pronunciation_overrides = []
+
+
+def _apply(text: str, job: DummyJob) -> str:
+    merged = conversion_runner._merge_pronunciation_overrides(job)
+    rules = conversion_runner._compile_pronunciation_rules(merged)
+    return conversion_runner._apply_pronunciation_rules(text, rules)
+
+
+def test_manual_override_is_applied_even_if_pronunciation_overrides_stale():
+    job = DummyJob()
+    job.manual_overrides = [
+        {
+            "token": "Unfu*k",
+            "pronunciation": "Unfuck",
+        }
+    ]
+
+    out = _apply("He said Unfu*k loudly.", job)
+    assert "Unfuck" in out
+    assert "Unfu*k" not in out
+
+
+def test_manual_override_takes_precedence_over_existing_pronunciation_override():
+    job = DummyJob()
+    job.pronunciation_overrides = [
+        {
+            "token": "Unfu*k",
+            "normalized": "unfu*k",
+            "pronunciation": "WRONG",
+        }
+    ]
+    job.manual_overrides = [
+        {
+            "token": "Unfu*k",
+            "pronunciation": "RIGHT",
+        }
+    ]
+
+    out = _apply("Unfu*k.", job)
+    assert "RIGHT" in out
+    assert "WRONG" not in out