Implement vue math (#7759)

Adds support for entering math inside number widgets in vue mode

![vue-math_00001](https://github.com/user-attachments/assets/e8ed7e2a-511f-4550-bfdd-1c467972d30d)

Migrates components to simple html elements (div and button) by
borrowing styling from the (reverted) reka-ui migration in #6985. The
existing (evil) litegraph eval code is extracted as a utility function
and reused.

This PR means we're entirely writing our own NumberField.

Also adds support for scrubbing widgets like in litegraph

![scrubbing_00001](https://github.com/user-attachments/assets/890bcd28-34f4-4be0-908f-657e43f671b0)

### Known Issue
- Scrubbing causes text to be highlighted, ~~starting a scrub from
highlighted text will instead drag the text~~.
- It seems this can only be prevented with `pointerdown.prevent`, but
this requires a manual `input.focus()` which does not place the cursor
at location of mouse click.

(Obligatory: _It won't do you a bit of good to review math_)

┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-7759-Implement-vue-math-2d46d73d365081b9acd4d6422669016e)
by [Unito](https://www.unito.io)

---------

Co-authored-by: github-actions <github-actions@github.com>
Co-authored-by: DrJKL <DrJKL0424@gmail.com>

src/lib/litegraph/src/utils/widget.ts

@@ -8,3 +8,18 @@ import type { IWidgetOptions } from '@/lib/litegraph/src/types/widgets'
 export function getWidgetStep(options: IWidgetOptions<unknown>): number {
   return options.step2 || (options.step || 10) * 0.1
 }
+
+export function evaluateInput(input: string): number | undefined {
+  // Check if v is a valid equation or a number
+  if (/^[\d\s.()*+/-]+$/.test(input)) {
+    // Solve the equation if possible
+    try {
+      input = eval(input)
+    } catch {
+      // Ignore eval errors
+    }
+  }
+  const newValue = Number(input)
+  if (isNaN(newValue)) return undefined
+  return newValue
+}

src/lib/litegraph/src/widgets/NumberWidget.ts

@@ -1,5 +1,5 @@
 import type { INumericWidget } from '@/lib/litegraph/src/types/widgets'
-import { getWidgetStep } from '@/lib/litegraph/src/utils/widget'
+import { evaluateInput, getWidgetStep } from '@/lib/litegraph/src/utils/widget'
 
 import { BaseSteppedWidget } from './BaseSteppedWidget'
 import type { WidgetEventOptions } from './BaseWidget'
@@ -68,19 +68,8 @@ export class NumberWidget
       'Value',
       this.value,
       (v: string) => {
-        // Check if v is a valid equation or a number
-        if (/^[\d\s()*+/-]+|\d+\.\d+$/.test(v)) {
-          // Solve the equation if possible
-          try {
-            v = eval(v)
-          } catch {
-            // Ignore eval errors
-          }
-        }
-        const newValue = Number(v)
-        if (!isNaN(newValue)) {
-          this.setValue(newValue, { e, node, canvas })
-        }
+        const parsed = evaluateInput(v)
+        if (parsed !== undefined) this.setValue(parsed, { e, node, canvas })
       },
       e
     )