Add core infrastructure for Linear Mode - a simplified form-based UI for ComfyUI workflows:
- Add optional onQueued callback to app.queuePrompt() for deterministic prompt ID tracking
- Create Linear Mode type definitions (widgets, templates, output images)
- Add template configuration with 10 promoted widgets
- Implement Pinia store with client-side history filtering via prompt ID tracking
- Add service layer for template loading and widget value manipulation
- Add composable for queue operations with automatic prompt tracking
- Add i18n strings for Linear Mode UI
- Add comprehensive unit tests (41 tests, 100% passing)
All user-facing strings use i18n. Template uses placeholder IDs.
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Co-Authored-By: Claude <noreply@anthropic.com>
