fix: resolve strict TypeScript variant errors

[dinhnguyenminhhoang]

Fixes #1041

Summary

• Fix strict TypeScript errors in AcidSquares TS-CSS and TS-TW variants.
• Fix nullable target narrowing in SpecularButton variants.
• Fix polymorphic tag and ref typing in SplitText variants.

Validation

• npm exec tsc -- --noEmit --pretty false
• npm exec vite build
• Browser smoke-tested dev and production routes.
• No console errors observed in affected components.

[Copilot]

Pull request overview

This PR resolves strict TypeScript typecheck failures across TS-CSS and TS-Tailwind component variants for AcidSquares, SpecularButton, and SplitText, aligning the variants with the repo’s strict TS configuration and addressing the errors described in #1041.

Changes:

• Fixes nullable/optional RenderTarget typing and usage in AcidSquares variants.
• Fixes nullable narrowing for the computed target angle in SpecularButton variants.
• Fixes polymorphic tag + ref typing in SplitText variants by switching to an HTMLElement ref strategy.

Reviewed changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
src/ts-tailwind/TextAnimations/SplitText/SplitText.tsx	Adjusts polymorphic tag/ref typing to avoid never props and ref typing issues under strict TS.
src/ts-tailwind/Components/SpecularButton/SpecularButton.tsx	Tightens nullable narrowing for animation target angle selection.
src/ts-tailwind/Backgrounds/AcidSquares/AcidSquares.tsx	Updates RenderTarget lifecycle/typing to avoid null vs undefined strict TS errors.
src/ts-default/TextAnimations/SplitText/SplitText.tsx	Mirrors SplitText polymorphic ref typing fix in the default variant.
src/ts-default/Components/SpecularButton/SpecularButton.tsx	Mirrors SpecularButton nullable narrowing fix in the default variant.
src/ts-default/Backgrounds/AcidSquares/AcidSquares.tsx	Mirrors AcidSquares RenderTarget typing/lifecycle updates in the default variant.

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