fix: youtube (services) comment formatter crashes on a non-dict comment (#1746)

tests/test_youtube_svc_comments_nondict.py

@@ -0,0 +1,15 @@
+from services.youtube.youtube_handler import format_comments_for_context
+
+
+def test_format_comments_skips_non_dict_entries():
+    # comments come from json.loads of yt-dlp output; a malformed entry (None
+    # or a bare string) made the old loop call .get on a non-dict and crash.
+    data = {"success": True, "comments": [
+        {"author": "alice", "text": "great", "likes": 4},
+        "junk-row",
+        None,
+        {"author": "bob", "text": "nice", "likes": 1},
+    ]}
+    out = format_comments_for_context(data, "https://youtu.be/x")
+    assert "@alice" in out and "@bob" in out
+    assert "junk-row" not in out