Brand consistency: emails say "upbeatBytes" (From + digest body)

Per the brand-name standard (camelCase, one word). Updated the SMTP From default and
the digest email body/subject strings. Live env From values (auth.env + goodnews.env)
updated to match. (Web/OG brand strings in share.py + app.html are the remaining sweep.)

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

goodnews/digest.py

@@ -127,7 +127,7 @@ def _item_html(it: dict, base: str) -> str:
         f'<div style="color:#5d6b78;font-size:13px;margin:3px 0 8px">{escape(it["source"])}</div>'
         f'{summary}{why}'
         '<div style="margin-top:10px;font-size:14px">'
-        f'<a href="{base}/a/{it["id"]}" style="color:#0083ad;text-decoration:none">Read on Upbeat Bytes</a>'
+        f'<a href="{base}/a/{it["id"]}" style="color:#0083ad;text-decoration:none">Read on upbeatBytes</a>'
         f' &nbsp;·&nbsp; <a href="{escape(it["canonical_url"])}" style="color:#5d6b78;text-decoration:none">Full story at source{lock}</a>'
         '</div></div>'
     )
@@ -145,12 +145,12 @@ def build_digest(items: list[dict], brief_date: str, unsub_url: str, base: str |
     followed = followed or []
     n = len(items)
     weekday = _weekday(brief_date)
-    subject = f"{weekday}'s Upbeat Bytes · {n} calm read{'' if n == 1 else 's'}"
+    subject = f"{weekday}'s upbeatBytes · {n} calm read{'' if n == 1 else 's'}"
     if weekday == "today":
-        subject = f"Today's Upbeat Bytes · {n} calm reads"
+        subject = f"Today's upbeatBytes · {n} calm reads"
 
     text_lines = [
-        f"Upbeat Bytes — Daily Highlights",
+        f"upbeatBytes — 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",
@@ -181,7 +181,7 @@ def build_digest(items: list[dict], brief_date: str, unsub_url: str, base: str |
         'font-family:-apple-system,Segoe UI,Roboto,Helvetica,Arial,sans-serif;color:#16263a">'
         # The real logo as a small hosted PNG (SVG isn't email-safe); alt text
         # keeps the brand when a client blocks remote images.
-        f'<img src="{base}/logo-email.png" alt="Upbeat Bytes" width="180" '
+        f'<img src="{base}/logo-email.png" alt="upbeatBytes" width="180" '
         'style="display:block;border:0;outline:none;text-decoration:none;height:auto;margin:0 0 2px">'
         '<div style="font-size:11px;letter-spacing:0.14em;text-transform:uppercase;color:#0083ad;'
         f'margin:5px 0 0">Daily Highlights · {escape(weekday)}</div>'
@@ -192,7 +192,7 @@ def build_digest(items: list[dict], brief_date: str, unsub_url: str, base: str |
         + main_blocks
         + followed_html
         + '<p style="font-size:15px;color:#3f7048;margin:8px 0 0">That’s today’s highlights — more good news is '
-          f'always <a href="{base}" style="color:#3f7048">waiting on Upbeat Bytes</a>. See you tomorrow.</p>'
+          f'always <a href="{base}" style="color:#3f7048">waiting on upbeatBytes</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>'

goodnews/email_send.py

@@ -24,7 +24,7 @@ def _cfg() -> dict:
         "port": int(os.environ.get("GOODNEWS_SMTP_PORT", "587")),
         "user": os.environ.get("GOODNEWS_SMTP_USER", ""),
         "password": os.environ.get("GOODNEWS_SMTP_PASSWORD", ""),
-        "sender": os.environ.get("GOODNEWS_SMTP_FROM", "Upbeat Bytes <hello@upbeatbytes.com>"),
+        "sender": os.environ.get("GOODNEWS_SMTP_FROM", "upbeatBytes <hello@upbeatbytes.com>"),
         # Where a reader's reply should land; falls back to the From address.
         "reply_to": os.environ.get("GOODNEWS_REPLY_TO_EMAIL", ""),
     }