Make the digest read like a newsletter

Each project leads with up to three cards: title, teaser and the cover
image as a thumbnail, the rest follows as a compact list. Entries sort by
number inside a project instead of jumping, and the project name links to
its archive.

tests/lib/weekly-report.test.ts

@@ -65,8 +65,8 @@ describe('buildMessage', () => {
 		const dump = JSON.stringify(message?.blocks)
 
 		expect(dump).toContain('27.07.2026 bis 03.08.2026')
-		expect(dump).toContain('*Trakk*')
-		expect(dump).toContain('*Orbit*')
+		expect(dump).toContain('|Trakk>*')
+		expect(dump).toContain('|Orbit>*')
 		expect(dump).toContain('TRK-0142')
 		expect(dump).toContain('https://logbuch.nyo.de/trakk/regel-engine')
 	})
@@ -83,3 +83,53 @@ describe('buildMessage', () => {
 		expect(JSON.stringify(message)).not.toMatch(/\p{Extended_Pictographic}/u)
 	})
 })
+
+describe('Karten', () => {
+	const base = {
+		from: new Date('2026-07-27T06:00:00.000Z'),
+		to: new Date('2026-08-03T06:00:00.000Z'),
+	}
+
+	it('setzt Anreißer und Bild an den Eintrag', () => {
+		const cover = new Map([['c0ffee00-0000-4000-8000-000000000001', {
+			postId: 'c0ffee00-0000-4000-8000-000000000001',
+			mediaId: 'm1',
+			alt: 'Regelmaske mit Bedingung und Aktion',
+			caption: null,
+			width: 1600,
+			height: 900,
+			variants: [{ width: 480, format: 'webp', path: 'trakk/m1/480.webp' }],
+		}]])
+
+		const projects = groupByProject([item({ teaser: 'Tickets reagieren jetzt selbst.' })])
+		const message = buildMessage({ ...base, total: 1, projects }, origin, cover as never)
+		const dump = JSON.stringify(message?.blocks)
+
+		expect(dump).toContain('Tickets reagieren jetzt selbst.')
+		expect(dump).toContain('https://logbuch.nyo.de/api/v1/media/file/trakk/m1/480.webp')
+		expect(dump).toContain('Regelmaske mit Bedingung und Aktion')
+	})
+
+	it('kürzt lange Anreißer', () => {
+		const long = `${'Wort '.repeat(80)}Ende`
+		const projects = groupByProject([item({ teaser: long })])
+		const dump = JSON.stringify(buildMessage({ ...base, total: 1, projects }, origin)?.blocks)
+
+		expect(dump).toContain('...')
+		expect(dump).not.toContain('Ende')
+	})
+
+	it('zeigt höchstens drei Karten je Projekt, der Rest kommt als Liste', () => {
+		const many = Array.from({ length: 5 }, (_, index) => item({
+			id: `c0ffee00-0000-4000-8000-00000000000${index}`,
+			slug: `beitrag-${index}`,
+			number: 140 + index,
+			title: `Beitrag ${index}`,
+		}))
+
+		const message = buildMessage({ ...base, total: 5, projects: groupByProject(many) }, origin)
+		const sections = (message?.blocks ?? []).filter(block => (block as { type: string }).type === 'section')
+
+		expect(sections).toHaveLength(5)
+	})
+})