refactor: remove duplicate comment_on_linear_issue from webapp, import from utils (#996)

* refactor: remove duplicate comment_on_linear_issue from webapp, import from utils.linear

* linting

apps/agent/agent/webapp.py

@@ -17,6 +17,7 @@ from langgraph_sdk import get_client
 # Local import for encryption
 from .encryption import encrypt_token
 from .utils.comments import get_recent_comments
+from .utils.linear import comment_on_linear_issue
 from .utils.multimodal import dedupe_urls, extract_image_urls, fetch_image_block
 
 logger = logging.getLogger(__name__)
@@ -272,52 +273,6 @@ async def react_to_linear_comment(comment_id: str, emoji: str = "👀") -> bool:
             return False
 
 
-async def comment_on_linear_issue(issue_id: str, comment_body: str) -> bool:
-    """Add a comment to a Linear issue.
-
-    Args:
-        issue_id: The Linear issue ID
-        comment_body: The comment text
-
-    Returns:
-        True if successful, False otherwise
-    """
-    if not LINEAR_API_KEY:
-        return False
-
-    url = "https://api.linear.app/graphql"
-
-    mutation = """
-    mutation CommentCreate($issueId: String!, $body: String!) {
-        commentCreate(input: { issueId: $issueId, body: $body }) {
-            success
-            comment {
-                id
-            }
-        }
-    }
-    """
-
-    async with httpx.AsyncClient() as client:
-        try:
-            response = await client.post(
-                url,
-                headers={
-                    "Authorization": LINEAR_API_KEY,
-                    "Content-Type": "application/json",
-                },
-                json={
-                    "query": mutation,
-                    "variables": {"issueId": issue_id, "body": comment_body},
-                },
-            )
-            response.raise_for_status()
-            result = response.json()
-            return bool(result.get("data", {}).get("commentCreate", {}).get("success"))
-        except Exception:  # noqa: BLE001
-            return False
-
-
 async def fetch_linear_issue_details(issue_id: str) -> dict[str, Any] | None:
     """Fetch full issue details from Linear API including description and comments.