Digest email: 'Daily Highlights' masthead + warm intro, point back to the site

Per user feedback: rename from 'Today's good news' (which implied the site was
done for the day) to a publication-style 'Upbeat Bytes — Daily Highlights'
masthead with a warm morning intro and a sign-off that links back to the site
('more good news is always waiting'). Adds 'why it's here' to the plain-text
part too. No images by design (lightweight, mail-client-safe).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

goodnews/digest.py

@@ -68,14 +68,21 @@ def build_digest(items: list[dict], brief_date: str, unsub_url: str, base: str |
     if weekday == "today":
         subject = f"Today's Upbeat Bytes · {n} calm reads"
 
-    text_lines = [f"Today's good news — {n} calm reads.\n"]
+    text_lines = [
+        f"Upbeat Bytes — Daily Highlights",
+        f"{n} calm read{'' if n == 1 else 's'} for {weekday}.\n",
+        "Good morning. A small, hopeful handful of what's going right — and there's",
+        "always more waiting on the site whenever you want it.\n",
+    ]
     for it in items:
         text_lines.append(f"• {it['title']}  ({it['source']})")
         if it.get("summary"):
             text_lines.append(f"  {it['summary']}")
+        if it.get("reason_text"):
+            text_lines.append(f"  Why it's here: {it['reason_text']}")
         text_lines.append(f"  Read: {base}/a/{it['id']}")
         text_lines.append(f"  Source: {it['canonical_url']}\n")
-    text_lines.append("That's today's good news. You're caught up — see you tomorrow.")
+    text_lines.append(f"That's today's highlights — more good news is always waiting at {base}. See you tomorrow.")
     text_lines.append(f"\nTo stop these emails: {unsub_url}")
     text = "\n".join(text_lines)
 
@@ -97,11 +104,16 @@ def build_digest(items: list[dict], brief_date: str, unsub_url: str, base: str |
     html = (
         '<div style="max-width:600px;margin:0 auto;padding:8px 4px;'
         'font-family:-apple-system,Segoe UI,Roboto,Helvetica,Arial,sans-serif;color:#16263a">'
-        '<h1 style="font-size:22px;margin:0 0 4px">Today’s good news</h1>'
+        '<div style="font-family:Georgia,\'Times New Roman\',serif;font-size:26px;font-weight:700;'
-        f'<p style="color:#5d6b78;font-size:14px;margin:0 0 22px">{n} calm reads for {escape(weekday)}</p>'
+        'letter-spacing:-0.01em;margin:0">Upbeat Bytes</div>'
+        '<div style="font-size:11px;letter-spacing:0.14em;text-transform:uppercase;color:#0083ad;'
+        f'margin:4px 0 0">Daily Highlights · {escape(weekday)}</div>'
+        '<p style="font-size:15px;line-height:1.5;color:#3b4754;margin:16px 0 24px">'
+        'Good morning. A small, hopeful handful of what’s going right — and there’s always more '
+        f'<a href="{base}" style="color:#0083ad;text-decoration:none">waiting on the site</a> when you want it.</p>'
         + "".join(blocks)
-        + '<p style="font-size:15px;color:#3f7048;margin:8px 0 0">That’s today’s good news. '
+        + '<p style="font-size:15px;color:#3f7048;margin:8px 0 0">That’s today’s highlights — more good news is '
-          'You’re caught up — see you tomorrow.</p>'
+          f'always <a href="{base}" style="color:#3f7048">waiting on Upbeat Bytes</a>. See you tomorrow.</p>'
         f'<p style="font-size:12px;color:#9aa6b2;margin-top:24px">You’re getting this because you turned on '
         f'the daily digest. <a href="{unsub_url}" style="color:#9aa6b2">Unsubscribe</a>.</p>'
         '</div>'

tests/test_digest.py

@@ -21,7 +21,8 @@ def test_build_digest_is_calm_and_dated():
     items = [{"id": 1, "title": "Good thing", "canonical_url": "http://a/1", "source": "Src", "summary": "nice", "reason_text": "wonder", "paywalled": False}]
     subject, text, html = digest.build_digest(items, "2026-06-09", "http://ub/unsub")
     assert "Tuesday's Upbeat Bytes" in subject and "1 calm read" in subject
-    assert "You're caught up" in text and "http://ub/unsub" in text
+    assert "Daily Highlights" in text and "Daily Highlights" in html
+    assert "more good news is always" in text and "http://ub/unsub" in text  # points back to the site
     assert "Good thing" in html and "Read on Upbeat Bytes" in html and "Unsubscribe" in html
     assert "you missed" not in (text + html).lower()  # no guilt language