fix: ignore nested KaTeX tables for line highlights (fix #2559)

[MapleQiAN]

Description

Fixes KaTeX line highlighting when display math contains nested KaTeX tables, such as pmatrix or substack. The highlighter now maps click ranges from only the top-level equation table, so nested matrix rows no longer shift the outer equation line count.

Fix #2559

Tests

• pnpm vitest run packages\client\logic\katex.test.ts
• pnpm vitest run packages\slidev\node\syntax\katex.test.ts
• pnpm eslint packages/client/logic/katex.ts packages/client/logic/katex.test.ts packages/client/builtin/KaTexBlockWrapper.vue
• git diff --check

pnpm typecheck still fails in existing docs/node_modules/vitepress files because some distributed .js modules do not have declarations.

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[kermanx]

#2579?

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commit: 6e20c3b