**Problem 1: Validation footer covers mobile menu**
- Fixed bottom validation panel (z-index 1000) overlapped mobile nav
- Solution: Removed bottom panel, added inline validation in config panel header
**Problem 2: Alert dialogs for save success**
- alert() blocks UI and requires OK click for every save
- Solution: Toast notifications (auto-close after 3s, non-blocking)
**Problem 3: Validation shows only counts, not details**
- Footer showed "1 Error, 2 Warnings" without details
- Solution: Inline display shows all error/warning messages with click-to-navigate
**New Components:**
- Toast.jsx: Auto-closing notifications (success/error/warning/info)
- ConfirmDialog.jsx: Modal confirmation dialogs (for future save-on-close)
**Changes:**
- WorkflowEditorPage: Inline validation in config panel, toast state
- Removed fixed bottom .validation-panel (no mobile overlap)
- Toast for save success instead of alert()
**Still TODO (separate commit):**
- Save confirmation when closing/switching nodes with unsaved changes
- Dirty state tracking
Part 3: Inline Prompts - UX polish (validation + notifications)
