feat(ui): extend TriggerConfig types to match all backend trigger variants

[geoffjay]

Replace TaskSourceConfig with full TriggerConfig covering all 14 backend trigger variants, rename Workflow.source_config to trigger_config, add helpers (getTriggerLabel, getTriggerCategory, getDefaultTriggerConfig), and update all consumers and test fixtures.

Closes #1096

[geoffjay]

This change is part of the following stack:

• feat(ui): install @xyflow/react and scaffold WorkflowCanvas base component #1107
  • feat(ui): extend TriggerConfig types to match all backend trigger variants #1108 ◀
    • feat(ui): create trigger source node components for workflow canvas #1109
      • feat(ui): create agent node and prompt template edge components #1110
        • feat(ui): implement graph-to-API serialization for workflow canvas save/load #1111
          • feat(ui): build node palette sidebar with drag-and-drop onto workflow canvas #1112
            • feat(ui): add workflow builder page with routing and persistence #1113
              • feat(ui): add read-only workflow visualization with auto-layout #1114

_{Change managed by git-spice.}

[geoffjay]

Review: feat(ui): extend TriggerConfig types to match all backend trigger variants

Stack position: issue-1096 (#1108) stacked on issue-1095 (#1107). Parent #1107 is being reviewed simultaneously and has no blocking issues.

Overview

This PR does two things: renames source_config → trigger_config across all consumers, and expands the TriggerConfig type from 2 variants (github_issues, github_pull_requests) to 13 comprehensive variants matching the backend's TriggerConfig enum. Adds getTriggerLabel, getTriggerCategory, and getDefaultTriggerConfig helpers. Keeps TaskSourceConfig as a deprecated alias for backward compatibility.

What looks good

• Exhaustive helpers: getTriggerLabel and getTriggerCategory use Record<TriggerType, ...> maps — if a new variant is added to the union and the record is not updated, TypeScript will error at compile time. getDefaultTriggerConfig uses a switch with no default case for the same reason. All three patterns enforce exhaustiveness correctly.
• Deprecated alias: export type TaskSourceConfig = TriggerConfig preserves backward compat without keeping dead code around.
• WorkflowDetail.sourceDetail expansion: The new switch properly handles all 13 variants. The default case falls back to getTriggerLabel which ensures future variants show something sensible rather than crashing.
• Test updates: All 3 changed test files correctly update fixture data from source_config to trigger_config. Test descriptions are updated to match.

Non-blocking note

The section comment in orchestrator.ts says "covers all 14 backend trigger variants", but counting the union members: github_issues, github_pull_requests, cron, delay, webhook, manual, linear_issues, agent_lifecycle, agent_idle, dispatch_result, composite, queue, ask_response = 13 variants. The getTriggerLabel map also has 13 entries. The getDefaultTriggerConfig switch has 13 cases. Worth correcting the comment before merge to avoid confusion in later PRs.

Verdict

Solid type expansion. The rename is handled consistently across all consumers, helpers are exhaustively typed, and backward compat is maintained. LGTM pending the comment correction.