[refactor] Migrate minimap to domain-driven renderer architecture (#5069)

* move ref initialization to the component

* remove redundant init

* [refactor] Move minimap to domain-driven renderer structure

- Create new src/renderer/extensions/minimap/ structure following domain-driven design
- Add composables: useMinimapGraph, useMinimapViewport, useMinimapRenderer, useMinimapInteraction, useMinimapSettings
- Add minimapCanvasRenderer with efficient batched rendering
- Add comprehensive type definitions in types.ts
- Remove old src/composables/useMinimap.ts composable
- Implement proper separation of concerns with dedicated composables for each domain

The new structure provides cleaner APIs, better performance through batched rendering,
and improved maintainability through domain separation.

* [test] Fix minimap tests for new renderer structure

- Update all test imports to use new renderer paths
- Fix mock implementations to match new composable APIs
- Add proper RAF mocking for throttled functions
- Fix type assertions to handle strict TypeScript checks
- Update test expectations for new implementation behavior
- Fix viewport transform calculations in tests
- Handle async/throttled behavior correctly in tests

All 28 minimap tests now passing with new architecture.

* [fix] Remove unused init import in MiniMap component

* [refactor] Move useWorkflowThumbnail to renderer/thumbnail structure

- Moved useWorkflowThumbnail from src/composables to src/renderer/thumbnail/composables
- Updated all imports in components, stores and services
- Moved test file to match new structure
- This ensures all rendering-related composables live in the renderer directory

* [test] Fix minimap canvas renderer test for connections

- Fixed mock setup for graph links to match LiteGraph's hybrid Map/Object structure
- LiteGraph expects links to be accessible both as a Map and as an object
- Test now properly verifies connection rendering functionality

src/services/workflowService.ts

@@ -1,9 +1,9 @@
 import { toRaw } from 'vue'
 
-import { useWorkflowThumbnail } from '@/composables/useWorkflowThumbnail'
 import { t } from '@/i18n'
 import { LGraph, LGraphCanvas } from '@/lib/litegraph/src/litegraph'
 import type { SerialisableGraph, Vector2 } from '@/lib/litegraph/src/litegraph'
+import { useWorkflowThumbnail } from '@/renderer/thumbnail/composables/useWorkflowThumbnail'
 import { ComfyWorkflowJSON } from '@/schemas/comfyWorkflowSchema'
 import { app } from '@/scripts/app'
 import { blankGraph, defaultGraph } from '@/scripts/defaultGraph'