docs: polish en version

[roife]

No description provided.

[github-actions]

Docs preview: https://vide.pascal-lab.net/preview/pr-187/

[Copilot]

Pull request overview

This PR polishes English documentation copy across the homepage data, English user guide and feature pages, and a few Chinese pages, and adds a localized English 404 page. Wording is tightened (e.g., "best-effort workspace index", "code exploration", "Go to Definition"), feature names are consistently capitalized, and a few small Chinese typo/terminology fixes are made.

Changes:

• Refines English feature descriptions and homepage copy for clarity and consistent capitalization of feature names.
• Updates terminology to "best-effort workspace index" / "code exploration", changes comparison meta to a uniform 'PASCAL', and rewords auto-expansion in the comparison table.
• Adds an English 404.md mirroring the Chinese 404 page, and fixes minor Chinese copy (项目项目 → 项目, description terminology).

Reviewed changes

Copilot reviewed 26 out of 26 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
docs/src/data/homepage.ts	Polishes English feature descriptions; renames autoexpand to auto-expansion; sets comparison meta to 'PASCAL' for both locales.
docs/src/content/docs/index.mdx	Updates Chinese homepage description terminology.
docs/src/content/docs/user-guide/index.mdx	Updates Chinese intro terminology.
docs/src/content/docs/user-guide/online-experience.mdx	Fixes Chinese duplicated 项目项目 typo.
docs/src/content/docs/en/index.mdx	Reworks English hero title/tagline to "A Modern SystemVerilog IDE".
docs/src/content/docs/en/404.md	Adds localized English 404 splash page.
docs/src/content/docs/en/user-guide/index.mdx	Rewrites the user-guide landing copy and card descriptions.
docs/src/content/docs/en/user-guide/first-project.mdx	Minor wording polish ("actual paths", "argument generation", etc.).
docs/src/content/docs/en/user-guide/online-experience.mdx	Quotes frontmatter description; polishes prose and capitalizes feature names.
docs/src/content/docs/en/user-guide/project-configuration.mdx	Rewords description and table cells; capitalizes feature names.
docs/src/content/docs/en/user-guide/features/index.mdx	Updates feature index description and card text.
docs/src/content/docs/en/user-guide/features/*.mdx	Various small wording refinements across feature pages (navigation, references, rename, hover, completion, annotations, quick-fixes, diagnostics, document-symbols, folding, semantic/syntax highlighting, selection-range, signature-help).
docs/src/content/docs/en/advanced-guide/parsing-and-analysis.md	Aligns terminology with "best-effort workspace index" and "code exploration".

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