improvement(content): surface last-verified and updated dates, codify citation rules (#5904)

* improvement(content): surface last-verified and updated dates, codify citation rules

Comparison pages already computed a latest-verified date from every fact
source's asOf and emitted it as JSON-LD dateModified, but never showed it.
Library and blog posts had the same gap: dateModified existed only as an
invisible meta tag. A freshness signal that no reader can see does nothing
for the reader deciding whether to trust the page.

- /comparisons/[provider] renders "Last verified <date>" from the existing
  getLatestVerifiedDate(), so the visible date and the JSON-LD read the
  same value and cannot drift
- /library and /blog posts render "Updated <date>" next to the publish
  date, only when the modified day actually differs; otherwise the meta
  fallback stays. dateModified is emitted exactly once either way
- collapse three duplicated toLocaleDateString blocks in
  content-post-page into one module-scope formatDate (same UTC pinning,
  identical output)
- landing-seo-geo rules: add citation/internal-linking and freshness
  sections, and extend the rule's paths to content MDX so it attaches when
  authoring posts, not just TSX

* fix(content): wrap post metadata row so the Updated date cannot overflow on narrow screens

The published/updated/authors/share row was a non-wrapping flex. With the
Updated label active and two authors it overflowed at 390px; the row also
already overflowed at 320px on staging before this PR, with no Updated
label at all. flex-wrap fixes both and leaves desktop identical.

* improvement(comparisons): fold last-verified date into the intro sentence

The paragraph already ended "Every fact below is sourced and dated" and a
separate line then stated the date, which read as redundant and added a
standalone metadata row to the header. Folding it into that sentence drops
the extra line and keeps the date as real server-rendered text in a <time>
element, so crawlers and AI answer engines still see it. A tooltip would
not: Tooltip.Content renders null during SSR and while closed.

.claude/rules/landing-seo-geo.md

@@ -1,6 +1,7 @@
 ---
 paths:
   - "apps/sim/app/(landing)/**/*.tsx"
+  - "apps/sim/content/**/*.mdx"
 ---
 
 # Landing Page — SEO / GEO
@@ -24,3 +25,22 @@ paths:
 - **Keyword density**: first 150 visible chars of Hero must name "Sim", "AI workspace", "AI agents".
 - **sr-only summaries**: Hero and Templates each have a `<p className="sr-only">` (~50 words) as an atomic product/catalog summary for AI citation.
 - **Specific numbers**: prefer concrete figures ("1,000+ integrations", "15+ AI providers") over vague claims.
+
+## Citations and linking (`/library`, `/blog`, `/comparisons`)
+
+The Princeton GEO study (Aggarwal et al., KDD 2024, [arXiv:2311.09735](https://arxiv.org/abs/2311.09735)) found that adding citations, quotations, and statistics were the three strongest of nine tested tactics, worth 30–40% relative lifts in AI-answer visibility. Sourcing is also what makes a claim checkable by a human reader.
+
+- **Every third-party factual claim carries an outbound source link.** Pricing, rate limits, feature availability, licensing, compliance certifications — link the primary source (the vendor's own pricing page, docs, changelog, or license file), not a secondary blog. External links get `rel="noopener noreferrer"`.
+- **Prefer the primary source over a roundup.** Citing another vendor's comparison post to substantiate a fact about them is second-hand and ages badly.
+- **Internal links: 3–5 per library post**, pointing at genuinely related library entries, using real `href`s (Next `<Link>` in TSX; a plain markdown link in MDX). A post with zero internal links is a dead end for crawlers and readers alike.
+- **Never fabricate a citation.** An unlinked claim is better than a link that does not substantiate it. If a number cannot be sourced, cut the number.
+
+## Freshness
+
+Answer engines weight recency to avoid repeating stale facts, and a reader deciding whether to trust a pricing comparison wants to know when it was last checked. The vendor-published "fresh content earns Nx more citations" figures are directional, not measured — the reason to do this is that both signals must agree and both must be real.
+
+- **Emit `dateModified`** in the page's structured data (JSON-LD or microdata), and emit it exactly once per document.
+- **Show the same date to the reader.** `/comparisons/[provider]` renders "Last verified …" from `getLatestVerifiedDate()`; `/library` and `/blog` posts render "Updated …" next to the publish date. A date that exists only in metadata is invisible to a reader deciding whether to trust the page.
+- **Only surface a modified date when it differs from the publish date** — an "Updated" label on the publish day is noise.
+- **Bump the date only on a substantive edit.** Touching frontmatter without changing the content is date-washing; it degrades the signal for every other page on the domain.
+- **Comparison facts are dated at the fact level.** Every `Fact` in `apps/sim/lib/compare/data` carries `sources: [{ url, label, asOf }]`. Re-checking a fact means updating its `asOf`, which flows through `getLatestVerifiedDate()` to the visible date, the JSON-LD, and the sitemap.

apps/sim/app/(landing)/comparisons/[provider]/page.tsx

@@ -177,7 +177,16 @@ export default async function ComparisonProviderPage({
               Sim is the open-source AI workspace where teams build, deploy, and manage AI agents
               visually, conversationally, or with code. Here is how Sim compares to{' '}
               {competitor.name} on platform architecture, AI capabilities, integrations, pricing,
-              security, and support. Every fact below is sourced and dated.
+              security, and support. Every fact below is sourced and dated, last verified{' '}
+              <time dateTime={latestVerified.toISOString().slice(0, 10)}>
+                {latestVerified.toLocaleDateString('en-US', {
+                  month: 'long',
+                  day: 'numeric',
+                  year: 'numeric',
+                  timeZone: 'UTC',
+                })}
+              </time>
+              .
             </p>
             <p className='sr-only'>
               Sim is an open-source AI workspace for building, deploying, and managing AI agents.

apps/sim/app/(landing)/components/content-post-page/content-post-page.tsx

@@ -7,6 +7,16 @@ import { BackLink } from '@/app/(landing)/components/back-link'
 import { JsonLd } from '@/app/(landing)/components/json-ld'
 import { ShareButton } from '@/app/(landing)/components/share-button'
 
+/** Renders an ISO date as "Jul 1, 2026". Pinned to UTC so the day matches the frontmatter date in every reader's timezone. */
+function formatDate(iso: string): string {
+  return new Date(iso).toLocaleDateString('en-US', {
+    month: 'short',
+    day: 'numeric',
+    year: 'numeric',
+    timeZone: 'UTC',
+  })
+}
+
 interface ContentPostPageProps {
   /** Route base path, e.g. `/blog` or `/library`. */
   basePath: string
@@ -32,6 +42,8 @@ export function ContentPostPage({
   shareUrl,
 }: ContentPostPageProps) {
   const Article = post.Content
+  const modifiedIso = post.updated ?? post.date
+  const showUpdated = modifiedIso.slice(0, 10) !== post.date.slice(0, 10)
 
   return (
     <article className='w-full bg-[var(--bg)]' itemScope itemType='https://schema.org/BlogPosting'>
@@ -73,20 +85,32 @@ export function ContentPostPage({
                 {post.description}
               </p>
             </div>
-            <div className='mt-6 flex items-center gap-6'>
-              <time
-                className='text-[var(--text-muted)] text-xs uppercase tracking-[0.1em]'
-                dateTime={post.date}
-                itemProp='datePublished'
-              >
-                {new Date(post.date).toLocaleDateString('en-US', {
-                  month: 'short',
-                  day: 'numeric',
-                  year: 'numeric',
-                  timeZone: 'UTC',
-                })}
-              </time>
-              <meta itemProp='dateModified' content={post.updated ?? post.date} />
+            <div className='mt-6 flex flex-wrap items-center gap-x-6 gap-y-2'>
+              <div className='flex items-center gap-2'>
+                <time
+                  className='text-[var(--text-muted)] text-xs uppercase tracking-[0.1em]'
+                  dateTime={post.date}
+                  itemProp='datePublished'
+                >
+                  {formatDate(post.date)}
+                </time>
+                {showUpdated ? (
+                  <>
+                    <span aria-hidden='true' className='text-[var(--text-muted)] text-xs'>
+                      ·
+                    </span>
+                    <time
+                      className='text-[var(--text-muted)] text-xs uppercase tracking-[0.1em]'
+                      dateTime={modifiedIso}
+                      itemProp='dateModified'
+                    >
+                      Updated {formatDate(modifiedIso)}
+                    </time>
+                  </>
+                ) : (
+                  <meta itemProp='dateModified' content={modifiedIso} />
+                )}
+              </div>
               <div className='flex items-center gap-3'>
                 {(post.authors || [post.author]).map((a) => (
                   <div key={a?.name} className='flex items-center gap-2'>
@@ -151,12 +175,7 @@ export function ContentPostPage({
                     </div>
                     <div className='flex flex-col gap-2'>
                       <span className='text-[var(--text-muted)] text-xs uppercase tracking-[0.1em]'>
-                        {new Date(p.date).toLocaleDateString('en-US', {
-                          month: 'short',
-                          day: 'numeric',
-                          year: 'numeric',
-                          timeZone: 'UTC',
-                        })}
+                        {formatDate(p.date)}
                       </span>
                       <h3 className='text-[var(--text-primary)] text-lg leading-tight tracking-[-0.01em]'>
                         {p.title}