feat: enable verbatimModuleSyntax in TypeScript config (#5533)

## Summary
- Enable `verbatimModuleSyntax` compiler option in TypeScript
configuration
- Update all type imports to use explicit `import type` syntax
- This change will Improve tree-shaking and bundler compatibility

## Motivation
The `verbatimModuleSyntax` option ensures that type-only imports are
explicitly marked with the `type` keyword. This:
- Makes import/export intentions clearer
- Improves tree-shaking by helping bundlers identify what can be safely
removed
- Ensures better compatibility with modern bundlers
- Follows TypeScript best practices for module syntax

## Changes
- Added `"verbatimModuleSyntax": true` to `tsconfig.json`
- Updated another 48+ files to use explicit `import type` syntax for
type-only imports
- No functional changes, only import/export syntax improvements

## Test Plan
- [x] TypeScript compilation passes
- [x] Build completes successfully  
- [x] Tests pass
- [ ] No runtime behavior changes

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

┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-5533-feat-enable-verbatimModuleSyntax-in-TypeScript-config-26d6d73d36508190b424ef9b379b5130)
by [Unito](https://www.unito.io)

src/extensions/core/saveMesh.ts

@@ -2,7 +2,7 @@ import { nextTick } from 'vue'
 
 import Load3D from '@/components/load3d/Load3D.vue'
 import Load3DConfiguration from '@/extensions/core/load3d/Load3DConfiguration'
-import { CustomInputSpec } from '@/schemas/nodeDef/nodeDefSchemaV2'
+import { type CustomInputSpec } from '@/schemas/nodeDef/nodeDefSchemaV2'
 import { ComponentWidgetImpl, addWidget } from '@/scripts/domWidget'
 import { useExtensionService } from '@/services/extensionService'
 import { useLoad3dService } from '@/services/load3dService'