chore: hoist text-measure import in yoga.ts; declare node>=22 engine

Addresses PR #23 review: move the mid-file text-measure import to the
top-level import block, and declare engines.node>=22 to match the
upgraded text stack (cli-truncate@6, slice-ansi@9 require node>=22).

packages/runtime/package.json

@@ -46,5 +46,8 @@
   },
   "peerDependencies": {
     "vue": "^3.4.0"
+  },
+  "engines": {
+    "node": ">=22"
   }
 }

packages/runtime/src/host/yoga.ts

@@ -9,6 +9,7 @@ import type {
   TuiText,
   TuiTransform,
 } from "./nodes.ts";
+import { flattenLeaves, measureTextNatural, wrapText } from "./text-measure.ts";
 
 type YogaCarrier = TuiRoot | TuiBox | TuiText | TuiStatic | TuiTransform;
 
@@ -314,8 +315,6 @@ export function applyYogaProp(node: YogaCarrier, key: string, value: unknown): v
 
 // --- text measure binding ------------------------------------------------
 
-import { flattenLeaves, measureTextNatural, wrapText } from "./text-measure.ts";
-
 export function bindTextMeasure(text: TuiText): void {
   text.yoga.setMeasureFunc((availableWidth) => {
     const raw = flattenLeaves(text);