NEWS RELAUNCH CUTOVER: promote the hub to /, feed to /news, go public

The big flip. /home3 (hub) becomes /; the feed lives at /news; both indexable.
- PROMOTE: routes/+page.svelte is now the hub (was the interim NewsFeed wrapper);
  noindex removed; "Read more good news" → /news. routes/home3 + home2 deleted.
- routes/+page.js: redirects legacy root-query links (/?view=latest, /?tag, /?source,
  /?q, /?view=today→highlights) to /news before the hub renders (no flash).
- /news: noindex dropped (route meta + Caddy @newsHidden removed); now public.
- LINKS: HubBar brand/Home → /, News default → /news; HubShell/art/play back → /;
  account Following + share.py Explore/Browse/source → /news.
- FOOTER: one shared Footer.svelte (motto + Send feedback + slot) across Hub/News/
  Play/Art/HubShell/Account/Zen; global layout footer removed (FeedbackModal stays).
- SITEMAP: + /news /art /play /word /quote /onthisday; cap 5k→50k; gated on
  has-summary; paywalled excluded; HEAD now 200 (api_route GET+HEAD).
- Head-patcher: /news entry. PWA + shell description broadened to the hub.
- Caddy: @newsHidden dropped; @hidden now admin-only (word/quote/onthisday public);
  /home2,/home3 → / 301. Mirrored to deploy/caddy snapshot.

425 backend + 36 frontend tests green; build clean; Caddy valid.

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

goodnews/share.py

@@ -27,7 +27,7 @@ def render_share_page(article: dict, base_url: str, summary: str | None = None,
     source_id = article.get("source_id")
     # Link the source name into the app's publication feed for that source.
     source_html = (
-        f'<a class="src srclink" href="/?source={source_id}">{escape(source)}</a>'
+        f'<a class="src srclink" href="/news?source={source_id}">{escape(source)}</a>'
         if source_id else f'<div class="src">{escape(source)}</div>'
     )
     src_url = article.get("canonical_url") or base_url
@@ -207,7 +207,7 @@ def render_share_page(article: dict, base_url: str, summary: str | None = None,
         <div class="actions">
           <a class="primary" href="{escape(src_url)}" target="_blank" rel="noopener" data-src-click>Read the full story at {escape(source)}</a>
           <button class="secondary" type="button" data-share>Copy link</button>
-          <a class="secondary" href="/">Explore Upbeat Bytes →</a>
+          <a class="secondary" href="/news">Explore Upbeat Bytes →</a>
         </div>
         <p class="note">Upbeat Bytes summarizes in its own words and links to the original publisher — it doesn't host the article.</p>
       </div>
@@ -329,7 +329,7 @@ def render_digest(items: list[dict], base_url: str, brief_date: str | None) -> s
     <h1>Today's good news</h1>
     <p class="lede">{escape(intro)}{f' · {escape(brief_date)}' if brief_date else ''}</p>
     {cards}
-    <p class="more"><a href="/">Browse more on Upbeat Bytes →</a></p>
+    <p class="more"><a href="/news">Browse more on Upbeat Bytes →</a></p>
   </main>
 </body>
 </html>"""