feat: add common file for signal folder

Author: wssheldon

src/dispatch/plugins/dispatch_slack/signal/common.py

@@ -0,0 +1,36 @@
+from blockkit import Context, Divider, MarkdownText, Modal, Section
+from slack_bolt import Ack
+
+
+def ack_mfa_required_submission_event(
+    ack: Ack, mfa_enabled: bool, challenge_url: str | None = None
+) -> None:
+    """Handles the add engagement submission event acknowledgement."""
+
+    if mfa_enabled:
+        mfa_text = (
+            "🔐 To complete this action, you need to verify your identity through Multi-Factor Authentication (MFA).\n\n"
+            f"Please <{challenge_url}|click here> to open the MFA verification page."
+        )
+    else:
+        mfa_text = "✅ No additional verification required. You can proceed with the confirmation."
+
+    blocks = [
+        Section(text=mfa_text),
+        Divider(),
+        Context(
+            elements=[
+                MarkdownText(
+                    text="💡 This step protects against unauthorized confirmation if your account is compromised."
+                )
+            ]
+        ),
+    ]
+
+    modal = Modal(
+        title="Confirm Your Identity",
+        close="Cancel",
+        blocks=blocks,
+    ).build()
+
+    ack(response_action="update", view=modal)