fix(feishu): extract table card rows

Maintainer edit: parse Feishu card table columns and rows so forwarded table cards do not fall back to [interactive], and add parser regression coverage.

tests/channels/test_feishu_card_extraction.py

@@ -0,0 +1,39 @@
+import json
+
+from nanobot.channels.feishu import _extract_share_card_content
+
+
+def test_extract_interactive_card_reads_user_dsl_body_elements() -> None:
+    content = {
+        "user_dsl": json.dumps(
+            {
+                "schema": "2.0",
+                "body": {"elements": [{"tag": "markdown", "content": "**hello**"}]},
+            }
+        )
+    }
+
+    assert _extract_share_card_content(content, "interactive") == "**hello**"
+
+
+def test_extract_interactive_card_reads_nested_text_elements() -> None:
+    content = {"elements": [[{"tag": "text", "text": "hello"}]]}
+
+    assert _extract_share_card_content(content, "interactive") == "hello"
+
+
+def test_extract_interactive_card_reads_table_rows() -> None:
+    content = {
+        "elements": [
+            {
+                "tag": "table",
+                "columns": [
+                    {"name": "c0", "display_name": "Name"},
+                    {"name": "c1", "display_name": "Score"},
+                ],
+                "rows": [{"c0": "Alice", "c1": 98}],
+            }
+        ]
+    }
+
+    assert _extract_share_card_content(content, "interactive") == "Name | Score\nAlice | 98"