feat: add announced checkbox to track rows

Add a persistent "announced" checkbox after each track's Announce button.
The state is stored in a new `announced` column on `show_tracks` and is
auto-set when the Announce button is pressed. The checkbox is also freely
togglable, and announced tracks have their Announce button disabled.

Also fixes .env leakage in test_config.py (pass _env_file=None) and adds
tests for the new DB method, API endpoint, and announce side-effect.

Made-with: Cursor

src/ntr_fetcher/db.py

@@ -55,6 +55,11 @@ class Database:
             conn.commit()
         except sqlite3.OperationalError:
             pass
+        try:
+            conn.execute("ALTER TABLE show_tracks ADD COLUMN announced INTEGER NOT NULL DEFAULT 0")
+            conn.commit()
+        except sqlite3.OperationalError:
+            pass
         conn.close()
 
     def upsert_track(self, track: Track) -> None:
@@ -154,9 +159,9 @@ class Database:
         conn = self._connect()
         rows = conn.execute(
             """
-            SELECT st.show_id, st.track_id, st.position, t.title, t.artist,
-                t.permalink_url, t.artwork_url, t.duration_ms, t.license,
-                t.liked_at, t.raw_json
+            SELECT st.show_id, st.track_id, st.position, st.announced,
+                t.title, t.artist, t.permalink_url, t.artwork_url,
+                t.duration_ms, t.license, t.liked_at, t.raw_json
             FROM show_tracks st
             JOIN tracks t ON st.track_id = t.id
             WHERE st.show_id = ?
@@ -173,9 +178,9 @@ class Database:
         conn = self._connect()
         row = conn.execute(
             """
-            SELECT st.show_id, st.track_id, st.position, t.title, t.artist,
-                t.permalink_url, t.artwork_url, t.duration_ms, t.license,
-                t.liked_at, t.raw_json
+            SELECT st.show_id, st.track_id, st.position, st.announced,
+                t.title, t.artist, t.permalink_url, t.artwork_url,
+                t.duration_ms, t.license, t.liked_at, t.raw_json
             FROM show_tracks st
             JOIN tracks t ON st.track_id = t.id
             WHERE st.show_id = ? AND st.position = ?
@@ -185,6 +190,17 @@ class Database:
         conn.close()
         return dict(row) if row else None
 
+    def set_track_announced(
+        self, show_id: int, position: int, announced: bool
+    ) -> None:
+        conn = self._connect()
+        conn.execute(
+            "UPDATE show_tracks SET announced = ? WHERE show_id = ? AND position = ?",
+            (int(announced), show_id, position),
+        )
+        conn.commit()
+        conn.close()
+
     def set_show_tracks(self, show_id: int, track_ids: list[int]) -> None:
         conn = self._connect()
         if track_ids: