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/load3d/Load3d.ts

@@ -1,7 +1,7 @@
 import * as THREE from 'three'
 
 import { LGraphNode } from '@/lib/litegraph/src/litegraph'
-import { CustomInputSpec } from '@/schemas/nodeDef/nodeDefSchemaV2'
+import { type CustomInputSpec } from '@/schemas/nodeDef/nodeDefSchemaV2'
 
 import { CameraManager } from './CameraManager'
 import { ControlsManager } from './ControlsManager'
@@ -16,11 +16,11 @@ import { SceneManager } from './SceneManager'
 import { SceneModelManager } from './SceneModelManager'
 import { ViewHelperManager } from './ViewHelperManager'
 import {
-  CameraState,
-  CaptureResult,
-  Load3DOptions,
-  MaterialMode,
-  UpDirection
+  type CameraState,
+  type CaptureResult,
+  type Load3DOptions,
+  type MaterialMode,
+  type UpDirection
 } from './interfaces'
 
 class Load3d {