Fix Rectangle/Rect type compatibility and unify type system

This commit addresses PR review comments by fixing the fundamental
type incompatibility between Rectangle (Array<number>) and strict
tuple types (Rect = [x, y, width, height]).

Key changes:
- Updated Rectangle class methods to accept both Rect and Rectangle unions
- Fixed all measure functions (containsRect, overlapBounding, etc.) to accept Rectangle
- Updated boundingRect interfaces to consistently use Rectangle instead of Rect
- Fixed all tests and Vue components to use Rectangle instead of array literals
- Resolved Point type conflicts between litegraph and pathRenderer modules
- Removed ReadOnlyPoint types and unified with Point arrays

The type system is now consistent: boundingRect properties return Rectangle
objects with full functionality, while Rect remains as a simple tuple type
for data interchange.

tests-ui/tests/litegraph/core/measure.test.ts

@@ -1,6 +1,7 @@
 // TODO: Fix these tests after migration
 import { test as baseTest } from 'vitest'
 
+import { Rectangle } from '@/lib/litegraph/src/infrastructure/Rectangle'
 import type { Point, Rect } from '@/lib/litegraph/src/interfaces'
 import {
   addDirectionalOffset,
@@ -132,8 +133,8 @@ test('snapPoint correctly snaps points to grid', ({ expect }) => {
 
 test('createBounds correctly creates bounding box', ({ expect }) => {
   const objects = [
-    { boundingRect: [0, 0, 10, 10] as Rect },
-    { boundingRect: [5, 5, 10, 10] as Rect }
+    { boundingRect: new Rectangle(0, 0, 10, 10) },
+    { boundingRect: new Rectangle(5, 5, 10, 10) }
   ]
 
   const defaultBounds = createBounds(objects)