enhancement(events): prompt assignee for triage in Slack

[aaronherman]

This pull request includes adding functionality to prompt assignees to update security events and adds a "visibility" field for case updates in Slack.

Workflow Enhancements:

• Added send_event_update_prompt_reminder to case_new_create_flow in src/dispatch/case/flows.py and in src/dispatch/case/messaging.py to remind assignees to update security event details during triage, which sends an ephemeral Slack message to the assignee with a button to update case details.

Slack Integration Updates:

• Added a new escalate_case command to ConversationCommands in src/dispatch/conversation/enums.py and mapped it to Slack configurations. [1] [2]
• Added update_case_button_click handler in src/dispatch/plugins/dispatch_slack/case/interactive.py to process the "Update Case" button click and open the update modal.

Case Visibility Field:

• Added case_visibility_select functionality in src/dispatch/plugins/dispatch_slack/fields.py to allow users to choose "Restricted" or "Open" visibility for cases.
• Updated handle_edit_submission_event in src/dispatch/plugins/dispatch_slack/case/interactive.py to process the visibility field and save changes.

[Copilot]

Pull Request Overview

This PR adds a reminder prompt for case assignees to complete security event triage in Slack, incorporates a new “visibility” field into case update modals, and wires up an escalate-case slash command.

• Map escalate_case command to Slack slash commands
• Introduce case_visibility_select field and handle it in the update modal/submission
• Add send_event_update_prompt_reminder and invoke it in the new case flow

Reviewed Changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
src/dispatch/plugins/dispatch_slack/plugin.py	Register escalate_case in Slack command mappings
src/dispatch/plugins/dispatch_slack/fields.py	Define case_visibility_select enum and builder function
src/dispatch/plugins/dispatch_slack/case/interactive.py	Add “Update Case” button handler, inject visibility into modal, and process it on submit
src/dispatch/plugins/dispatch_slack/case/enums.py	Add new CaseNotificationActions.update
src/dispatch/conversation/enums.py	Add new ConversationCommands.escalate_case
src/dispatch/case/messaging.py	Implement send_event_update_prompt_reminder
src/dispatch/case/flows.py	Invoke the new reminder step in case_new_create_flow

Comments suppressed due to low confidence (1)

src/dispatch/case/messaging.py:381

• Consider adding unit tests or an integration test for send_event_update_prompt_reminder to ensure ephemeral messages are sent under expected conditions.

def send_event_update_prompt_reminder(case: Case, db_session: Session) -> None: