test(scripts): update palette query (#30842)

Issue number: N/A

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## What is the current behavior?
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`high-contrast` and `high-contrast-dark` palettes were not working when
requested through a URL query or hash for a test page. This was due to
the `match` not accepting hyphens so it would only save `high` which is
not a valid palette.

## What is the new behavior?
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this PR. -->

- Updated `match` to accept hyphens
- Added an error if an invalid palette is provided
- Added a palette fallback if an invalid palette is provided
- Added a class check for high contrast and high contrast dark

## Does this introduce a breaking change?

- [ ] Yes
- [x] No

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## Other information

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screenshots of how the component looks before and after the change. -->

How to test:
1. Verify that `?palette=high-contrast`, `?palette=high-contrast-dark`,
`#palette=high-contrast`, and `#palette=high-contrast-dark` render
correctly (I recommend using [button basic
page](https://ionic-framework-git-scripts-ionic1.vercel.app/src/components/button/test/basic/))

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Co-authored-by: Brandy Smith <[email protected]>

Author: thetaPC

core/scripts/testing/scripts.js

@@ -57,11 +57,19 @@
    * Values can be `light`, `dark`, `high-contrast`,
    * or `high-contrast-dark`. Default to `light` for tests.
    */
-  const paletteQuery = window.location.search.match(/palette=([a-z]+)/);
-  const paletteHash = window.location.hash.match(/palette=([a-z]+)/);
+  const validPalettes = ['light', 'dark', 'high-contrast', 'high-contrast-dark'];
+  const paletteQuery = window.location.search.match(/palette=([a-z-]+)/);
+  const paletteHash = window.location.hash.match(/palette=([a-z-]+)/);
   const darkClass = document.body?.classList.contains('ion-palette-dark') ? 'dark' : null;
+  const highContrastClass = document.body?.classList.contains('ion-palette-high-contrast') ? 'high-contrast' : null;
+  const highContrastDarkClass = darkClass && highContrastClass ? 'high-contrast-dark' : null;
 
-  const paletteName = paletteQuery?.[1] || paletteHash?.[1] || darkClass || 'light';
+  let paletteName = paletteQuery?.[1] || paletteHash?.[1] || highContrastDarkClass || darkClass || highContrastClass || 'light';
+
+  if (!validPalettes.includes(paletteName)) {
+    console.warn(`Invalid palette name: '${paletteName}'. Falling back to 'light' palette.`);
+    paletteName = 'light';
+  }
 
   if (paletteName !== 'light') {
     const linkTag = document.createElement('link');