feat(weather): add weather location search

tests/common/mock.py

@@ -0,0 +1,17 @@
+from pathlib import Path
+
+from gallery.sketch.source import ApiSource
+
+
+class MockSource(ApiSource):
+
+    def __init__(self, path: Path, mapping: dict[str, str]):
+        super().__init__("")
+        self._path = path
+        self._mapping = mapping
+
+    async def request(self, endpoint: str) -> str:
+        for pattern, filename in self._mapping.items():
+            if pattern in endpoint:
+                return (self._path / filename).read_text()
+        raise ValueError(endpoint)