[refactor] Add type imports across codebase for verbatim module syntax

- Update all Vue components to use type imports
- Update all TypeScript files to use type imports
- Update test files to use type imports
- Ensure compliance with TypeScript verbatim module syntax

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

tests-ui/tests/composables/canvas/useSelectedLiteGraphItems.test.ts

@@ -2,10 +2,10 @@ import { createPinia, setActivePinia } from 'pinia'
 import { beforeEach, describe, expect, it, vi } from 'vitest'
 
 import { useSelectedLiteGraphItems } from '@/composables/canvas/useSelectedLiteGraphItems'
+import type { Positionable } from '@/lib/litegraph/src/litegraph'
 import {
   LGraphEventMode,
   LGraphNode,
-  Positionable,
   Reroute
 } from '@/lib/litegraph/src/litegraph'
 import { app } from '@/scripts/app'