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/SceneModelManager.ts

@@ -2,7 +2,7 @@ import * as THREE from 'three'
 import { LineMaterial } from 'three/examples/jsm/lines/LineMaterial'
 import { LineSegments2 } from 'three/examples/jsm/lines/LineSegments2'
 import { LineSegmentsGeometry } from 'three/examples/jsm/lines/LineSegmentsGeometry'
-import { GLTF } from 'three/examples/jsm/loaders/GLTFLoader'
+import { type GLTF } from 'three/examples/jsm/loaders/GLTFLoader'
 import { mergeVertices } from 'three/examples/jsm/utils/BufferGeometryUtils'
 
 import { ColoredShadowMaterial } from './conditional-lines/ColoredShadowMaterial'
@@ -11,11 +11,11 @@ import { ConditionalEdgesShader } from './conditional-lines/ConditionalEdgesShad
 import { ConditionalLineMaterial } from './conditional-lines/Lines2/ConditionalLineMaterial'
 import { ConditionalLineSegmentsGeometry } from './conditional-lines/Lines2/ConditionalLineSegmentsGeometry'
 import {
-  EventManagerInterface,
-  Load3DOptions,
-  MaterialMode,
-  ModelManagerInterface,
-  UpDirection
+  type EventManagerInterface,
+  type Load3DOptions,
+  type MaterialMode,
+  type ModelManagerInterface,
+  type UpDirection
 } from './interfaces'
 
 export class SceneModelManager implements ModelManagerInterface {