This comprehensive restore includes:
## Test Run System Restoration
- Restore test-run-menu.tsx component with multi-trigger support and keyboard shortcuts
- Restore use-dynamic-test-run-options.tsx hook for dynamic trigger option generation
- Restore workflow-entry.ts utilities for entry node detection and validation
- Integrate complete test run functionality back into run-mode.tsx
## Block Selector System Fixes
- Fix workflow block selector constants by uncommenting BLOCKS and START_BLOCKS arrays
- Restore proper i18n translations for trigger node descriptions using workflow.blocksAbout keys
- Filter trigger types from Blocks tab to prevent duplication with Start tab
- Fix trigger node handle display to match start node behavior (hide left input handles)
## Workflow Validation System Improvements
- Restore unified workflow validation using correct getValidTreeNodes(nodes, edges) signature
- Remove duplicate Start node validation from isRequired mechanism
- Eliminate "user input must be added" validation error by setting Start node isRequired: false
- Fix end node connectivity validation to properly detect valid workflow chains
## Component Integration
- Verify all dependencies exist (TriggerAll icon, useAllTriggerPlugins hook)
- Maintain keyboard shortcut integration (Alt+R, ~, 0-9 keys)
- Preserve portal-based dropdown positioning and tooltip structure
- Support multiple trigger types: user_input, schedule, webhook, plugin, all
This restores the complete test run functionality that was missing from feat/trigger branch
by systematically analyzing and restoring components from feat/trigger-backup-before-merge.
zhsama