[juliojimenez]

…ernews demo, trim the footer

What / why

Four fixes to the landing site; no compiler, rules or UDF changes.

• Centered the two 2x2 card grids ("Built for queries that are programs" and "Rule packs running on real data"). Both blocks sat visibly left of their centered headings. Two causes: Vite code-splits click-ui's per-component CSS into the landing page's own stylesheet, which loads after styles.css, so .feature-grid { max-width: 940px } lost the equal-specificity tie against GridContainer's own max-width and the grid spanned the full 1200px; and CardSecondary clamps itself to 320–420px, so each card start-aligned inside its oversized cell. The cap now goes through GridContainer's maxWidth prop (an inline custom property, immune to stylesheet order), and .feature-grid .feature-card lifts the card clamp so each card fills its cell. The 620px media query is gone because GridContainer already collapses to one column at ≤768px. The CSS comment records the stylesheet-order trap.
• Hackernews demo: dropped the shouting-titles card. It cannot run on the public playground (it needs the local clicklisp_shout executable UDF) and only ever rendered a "not runnable here" badge. Demo.nonRunnable is replaced by Demo.hiddenRules, which DemoLayout filters on, and the now-dead badge branch is removed from RuleCard. The query stays in examples/analytics/hackernews.lisp and in the generated JSON; README's local-ClickHouse section still covers it and gains one clause saying UDF-dependent queries stay off the demo pages.
• Footer: removed the click-ui link from the ClickHouse column. The bottom bar already credits @clickhouse/click-ui; that surviving link now opens in a new tab, as the removed one did and as every other footer link does.

Verified in headless Chrome against the production build and under vite dev: at 1400px both grids are 940px wide with 130px on each side and four equal 462px cards; one full-width column at 760px and 375px with no overflow; the hackernews page lists hype-tracker, long-words and prolific-authors; the ClickHouse footer column has three links.

Not touched, pre-existing and unrelated: below ~700px the page scrolls horizontally because the Get started code pane inside the click-ui Panel does not shrink. Worth a separate fix (width: 100%; min-width: 0 on that pane).

Checklist

• make test and make smoke pass
• README.md and site/ updated if behavior or docs changed (samples in site/src/samples.ts stay verbatim)
• Tests added/updated for compiler, rules, or UDF changes (n/a: site-only change)
• Code stays portable to ECL 21.2.1 (no Lisp changes)

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