feat(home): add a Taopedia At A Glance statistics band

[jason020818]

What & why — Refs #521

The landing page surfaces topics, core articles, subnets, and recent changes, but it never shows the overall scale of the wiki. A reader can't tell whether the knowledge base is broad or thin without leaving for Special:Statistics — the hero only mentions the article count in passing.

This adds a compact, purely static Taopedia At A Glance band directly under the hero with the three headline figures the directory already tracks — Articles, Topics, and Subnets — each linking to its Special: directory.

• Counts come straight from the same build-time artifacts the linked pages use (the slug map, the category index, and the shared buildSubnets() roster), so the band can never disagree with Special:AllPages, Special:Categories, or Special:Subnets.
• Topics uses the same "categories with at least one article" definition Special:Statistics reports.
• No interaction behavior is introduced — no hover, focus, transition, or script changes anywhere in the diff. The entire visible effect is the static band shown below, so static before/after screenshots fully demonstrate the change.

Screenshots

• Page URL: / (homepage)
• Viewport: 1280 px wide
• Action taken: none — the band renders statically on page load
• Expected before: no scale information under the hero
• Expected after: the At A Glance band under the hero, showing the live build-time counts (figures naturally track the content as it grows; the screenshots demonstrate the layout)

Before:

After:

The new band, close up:

Target Branch

• This PR targets test

Testing

• astro build renders the band on / (verified in dist/index.html)
• node scripts/check-home-links.js passes (no bare-slug article links introduced)
• Each figure reads from the same build artifact as the Special: page it links to (slug map → Special:AllPages, category index → Special:Categories, buildSubnets() → Special:Subnets), so the band can never disagree with them
• The diff contains no :hover/:focus/transition/script changes — the change is fully demonstrated by the static screenshots above

[taopedia-site-maintainer]

Verdict: Needs visual approval

PR #1972: feat(home): add a Taopedia At A Glance statistics band

Engineering:

• Review type: Visual/product review
• CI: All required CI checks passed: build
• Cross-repo build: pass
• Risk: medium
• Changed files: 1
• Changed lines: 67

Changed files:

• src/pages/index.astro

Guardrails:

• Visual layout/style/rendering files changed; visual approval required.

Decision surface:

• Checks and cross-repo build passed; this is waiting on visual approval only.
• If the after screenshots look correct, comment /merge.
• If they look wrong or the change should not ship, comment /close.

What to check:

• Homepage: changed article/search modules, link targets, and first-screen layout.

Preview links:

• Production reference: https://taopedia.org
• No automatic Netlify preview is available. Comment /preview to create on-demand before/after draft deploys for this PR.

Cross-repo validation:

• pass merged checkout: PR head eaac399 merges cleanly into test. Build/render is validated by the required GitHub Actions build check.

Human decision:

• Review only the visual evidence shown above for product fit.
• Comment /merge to merge if this should ship.
• Comment /close to close if this should not ship.

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Automated review by Taopedia Site Maintainer.