Describe Meme entry pages for search and share cards (#55)

ddiff --git a/server/http/pages.js b/server/http/pages.js
iindex b57512a..a4ac96c 100644
---- a/server/http/pages.js
++++ b/server/http/pages.js
@@@ -56,6 +56,19 @@ function createPageRoutes(ctx) {
      });
  
      // ── One entry ────────────────────────────────────────────
++    /** A search result and share-card line: the entry's own summary or first use, cut at a word to 155 characters. */
++    function metaDescription(e, citations = []) {
++        const origin = citations.find((c) => c.role === 'origin') || citations[0] || null;
++        const own = [e.summary, origin && origin.quote_text]
++            .map((v) => (typeof v === 'string' ? v.replace(/\s+/g, ' ').trim() : ''))
++            .find((v) => v.length >= 40);
++        if (!own) return `${e.title}: where the joke started, how it spread, and every use on OpenVibe.`;
++        if (own.length <= 155) return own;
++        const cut = own.slice(0, 154);
++        const at = cut.lastIndexOf(' ');
++        return `${(at > 40 ? cut.slice(0, at) : cut).replace(/[\s,;:.!?-]+$/, '')}…`;
++    }
++
      async function entryPage(req, res, { problem = null } = {}) {
          const slug = String(req.params.slug || '');
          const row = await entries.bySlug(slug);
@@@ -63,17 +76,18 @@ function createPageRoutes(ctx) {
          if (!row || (row.visibility === 'hidden' && !staff)) return notFound(req, res);
          const citations = await entries.citations(row.id);
          const e = entries.wireEntry(row);
++        const description = metaDescription(e, citations);
          const jsonLd = seo.jsonLd.webPage({
              name: e.title,
              url: `${base()}/m/${e.slug}`,
--            description: (e.summary || `${e.title} on OpenVibe.Meme`).slice(0, 160),
++            description,
              siteUrl: base(),
          });
          return page(req, res, {
              index: e.visibility === 'public',
              cache: e.visibility === 'public' ? PUBLIC_CACHE : null,
              title: e.title,
--            description: (e.summary || `${e.title} on OpenVibe.Meme`).slice(0, 160),
++            description,
              jsonLd: [jsonLd],
              body: raw(views.entry({ e, citations, signedIn: Boolean(signedIn(req)), staff, reported: req.query.reported === '1', problem })),
          });
ddiff --git a/test/pages.test.js b/test/pages.test.js
iindex de7f4be..5e5203d 100644
---- a/test/pages.test.js
++++ b/test/pages.test.js
@@@ -26,6 +26,11 @@ function jsonLd(html) {
              { role: 'use', source_service: 'live', source_type: 'vod', source_id: '9002', vod_id: 9002, offset_seconds: 120, quote_text: 'the robot is offline for good', url: `${t.upstreams.url}/v/9002?t=120`, observed_at: now },
          ],
      });
++    const describedEntry = await t.ctx.entries.createCandidate({
++        slug: 'cat-typing', title: 'Cat typing', kind: 'meme', status: 'rising',
++        summary: 'A cat at a keyboard, typed as though the cat is answering a work email one slow paw at a time.',
++        first_seen_at: now, last_seen_at: now, visibility: 'public', citations: [],
++    });
      const hiddenEntry = await t.ctx.entries.createCandidate({
          slug: 'not-yet', title: 'Not yet', kind: 'joke', summary: 'Hidden.', status: 'rising',
          first_seen_at: now, last_seen_at: now, visibility: 'hidden',
@@@ -65,6 +70,13 @@ function jsonLd(html) {
              assert.ok(r.text.includes('/v/9002?t=120'));
          });
  
++        await check('one entry page describes itself for search and share cards', async () => {
++            const fallback = await t.get('/m/robot-is-offline');
++            assert.ok(fallback.text.includes('<meta name="description" content="Robot is offline: where the joke started, how it spread, and every use on OpenVibe.">'), 'the fallback line');
++            const own = await t.get('/m/cat-typing');
++            assert.ok(own.text.includes('<meta name="description" content="A cat at a keyboard, typed as though the cat is answering a work email one slow paw at a time.">'), 'the entry\'s own summary');
++        });
++
          await check('a hidden entry is 404 to the public and visible to staff', async () => {
              assert.strictEqual((await t.get('/m/not-yet')).status, 404);
              assert.strictEqual((await t.get('/m/not-yet', { as: alice })).status, 404);