Summary

• Add WorkflowEditPage with full form editing for Xcode Cloud workflows: general settings, environment (Xcode/macOS version selection), start conditions (branch, tag, pull request, scheduled), actions, and environment variables link
• Add backend GET/PATCH endpoints for single workflow with Xcode/macOS version resolution via JSON:API include
• Add tag start condition display on the workflows list
• Add CI constants (action types, platforms, schedule frequencies, days of week)
• Preserve manual start conditions through form round-trip to prevent silent data loss on save
• Proper cache invalidation scoped to the specific account on workflow mutation

Test plan

• npm run build passes
• All 44 tests pass (vitest run)
• Navigate to an app's Xcode Cloud page, click a workflow to open the editor
• Edit workflow name, toggle enabled/disabled, change Xcode version -- verify Save button activates
• Save changes and verify success feedback, then reload to confirm persistence
• Switch between start condition types (branch/tag/PR/scheduled) and verify form resets correctly
• Add/remove actions, edit scheme and platform fields
• Test browser back/forward navigation between workflow editor and Xcode Cloud page
• Deep-link directly to a workflow edit URL and verify it loads correctly