fix(python): preserve phrase semantics in sync queries (#3654)

## Summary

- serialize sync phrase queries consistently for execution and query
plans
- restore the documented no-argument hybrid `phrase_query()` behavior
- keep reranker input as the original user text without mutating the
builder

Fixes #3653.

## Testing

- `python/.venv/bin/python -m pytest <8 focused test nodes> -q` (`8
passed`)
- `python/.venv/bin/python -m ruff format --check
python/python/lancedb/query.py python/python/tests/test_fts.py
python/python/tests/test_hybrid_query.py`
- `python/.venv/bin/python -m ruff check .`
- `git diff --check origin/main...HEAD`

The complete hybrid module and the real native FTS phrase test were not
completed
in the current PyO3 runtime environment: both stalled in the native
`lancedb.connect()` fixture and were interrupted without an assertion
failure.

python/python/tests/test_hybrid_query.py

@@ -1,6 +1,8 @@
 # SPDX-License-Identifier: Apache-2.0
 # SPDX-FileCopyrightText: Copyright The LanceDB Authors
 
+from unittest import mock
+
 import lancedb
 
 from lancedb.query import LanceHybridQueryBuilder
@@ -191,6 +193,23 @@ async def test_analyze_plan(table: AsyncTable):
     assert "metrics=" in res
 
 
+def test_hybrid_phrase_query_is_preserved_in_analyze_plan():
+    table = mock.Mock()
+    analyzed_queries = []
+    table._analyze_plan.side_effect = lambda query: analyzed_queries.append(query) or ""
+
+    (
+        LanceHybridQueryBuilder(table)
+        .vector([0.1, 0.2])
+        .text("puppy runs")
+        .phrase_query()
+        .analyze_plan()
+    )
+
+    assert len(analyzed_queries) == 2
+    assert analyzed_queries[1].full_text_query.query == '"puppy runs"'
+
+
 @pytest.fixture
 def table_with_id(tmpdir_factory) -> Table:
     tmp_path = str(tmpdir_factory.mktemp("data"))