[Repo Assist] Fix HtmlElement SVG serialisation: LinearGradient/RadialGradient emitted invalid tag (radient)

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Summary

Fix a typo in HtmlElement.ToString() that caused LinearGradient and RadialGradient to emit the invalid SVG tag (radient) instead of the correct (linearGradient) and (radialGradient).

Root Cause

In HtmlModel.fs, the helper match expression delegates to a format helper by passing the tag name as a string literal. Both LinearGradient and RadialGradient cases were passing "radient" instead of "linearGradient" and "radialGradient" respectively:

// Before (wrong):
| LinearGradient(props, children) -> format "radient" props children level
| RadialGradient(props, children) -> format "radient" props children level

// After (correct):
| LinearGradient(props, children) -> format "linearGradient" props children level
| RadialGradient(props, children) -> format "radialGradient" props children level

This is a pure typo — both branches accidentally shared the string "radient" instead of the full SVG tag names.

Impact

Any code that builds an HtmlElement.LinearGradient or HtmlElement.RadialGradient tree and serialises it to a string (via ToString() or the Razor template pipeline) would produce (radient) elements, which are invalid SVG and would be silently ignored by browsers.

Changes

File	Change
src/FSharp.Formatting.Common/HtmlModel.fs	Fix tag name strings for LinearGradient and RadialGradient
RELEASE_NOTES.md	Add [Unreleased] changelog entry

Test Status

• ✅ dotnet build FSharp.Formatting.sln --configuration Release — succeeded (1 pre-existing FS0760 warning, unchanged)
• ✅ dotnet test tests/FSharp.Markdown.Tests — 281/281 passed
• ✅ dotnet fantomas src/FSharp.Formatting.Common/HtmlModel.fs --check — no formatting issues

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