fix: warn on NaN/Infinity values in dev mode

NumberFlow and SkiaNumberFlow now emit a warnOnce when value is
non-finite, helping developers catch formatting bugs early.

Author: Rednegniw

.changeset/warn-non-finite-values.md

@@ -0,0 +1,5 @@
+---
+"number-flow-react-native": patch
+---
+
+Add dev-mode warnings when `value` is `NaN` or `Infinity`

packages/number-flow-react-native/src/native/NumberFlow.tsx

@@ -53,6 +53,9 @@ export const NumberFlow = ({
   const { metrics, MeasureElement } = useMeasuredGlyphMetrics(nfStyle, formatChars, digitStrings);
 
   if (__DEV__) {
+    if (typeof value === "number" && !Number.isFinite(value)) {
+      warnOnce("nf-non-finite", `value must be a finite number, got ${value}.`);
+    }
     if (digits) {
       for (const [posStr, constraint] of Object.entries(digits)) {
         if (constraint.max < 1 || constraint.max > 9) {

packages/number-flow-react-native/src/skia/SkiaNumberFlow.tsx

@@ -507,6 +507,9 @@ export const SkiaNumberFlow = ({
         "font is null. Pass a loaded SkFont from useFont(). Component renders empty until font loads.",
       );
     }
+    if (value !== undefined && !Number.isFinite(value)) {
+      warnOnce("skia-nf-non-finite", `value must be a finite number, got ${value}.`);
+    }
     if (value !== undefined && sharedValue !== undefined) {
       warnOnce("skia-nf-both", "Both value and sharedValue provided. Use one or the other.");
     }