fix(platform): preserve percent encoding in Url.setUrlParams and modifyUrlParams

[Gdhanush-13]

What

Fixes #6153 - Url.modifyUrlParams converts %20 to + in query parameters, even when using an identity function.

Root Cause

Url.setUrlParams and Url.modifyUrlParams both use UrlParams.toString to serialize params back to a search string. UrlParams.toString delegates to new URLSearchParams(...).toString() which encodes spaces as + per the application/x-www-form-urlencoded spec. This is correct for form request bodies but wrong for URL query strings where %20 should be preserved.

Reproduction

const url = new URL('https://example.com?foo=bar%20baz');
const url2 = Url.modifyUrlParams(url, identity);
url.href === url2.href; // false! %20 became +

Fix

• Added UrlParams.toPercentEncoded which uses encodeURIComponent (producing %20 for spaces)
• Updated Url.setUrlParams and Url.modifyUrlParams to use toPercentEncoded instead of toString
• Left UrlParams.toString unchanged for backward compatibility with application/x-www-form-urlencoded body encoding

Files Changed

• packages/platform/src/UrlParams.ts - added toPercentEncoded
• packages/platform/src/Url.ts - use toPercentEncoded in setUrlParams and modifyUrlParams

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