Sign in with a button on signed-out pages (#160)

ddiff --git a/server/http/pages.js b/server/http/pages.js
iindex 1fe664b..3e09052 100644
---- a/server/http/pages.js
++++ b/server/http/pages.js
@@@ -365,7 +365,7 @@ ${quests.coinsNote(coinsUi)}
              body: html`<h1>Your quest log</h1>
  <p>Quest keeps one log per person, across every site. Sign in with OpenVibe to see yours: what you have done, what
  each quest still needs, and the badges you have earned.</p>
--<p><a href="/auth/login?next=%2Fme">Sign in with OpenVibe</a></p>
++<p><a class="sc-btn sc-primary" href="/auth/login?next=%2Fme">Sign in with OpenVibe</a></p>
  <p class="muted">Your progress is read from this site's database only, and only for you. Nobody else's log is shown here, and yours is not shown on anyone else's.</p>
  <p><a href="/how-it-works">How progress works</a> · <a href="/quests">The quests</a></p>`,
          });
ddiff --git a/server/render/layout.js b/server/render/layout.js
iindex 1aaaed4..efcbdf2 100644
---- a/server/render/layout.js
++++ b/server/render/layout.js
@@@ -94,7 +94,8 @@ function renderPage(o) {
          head: `<meta name="referrer" content="${o.noReferrer ? 'no-referrer' : 'strict-origin-when-cross-origin'}">
  ${appIcon.headTags({ site: 'quest' })}
  <link rel="stylesheet" href="${asset('css/app.css')}">
--${(o.styles || []).map((name) => `<link rel="stylesheet" href="${esc(ovServe.url(name))}">`).join('\n')}
++<!-- The shared showcase stylesheet on every page, not only the home: inner pages use its buttons (sc-btn), and without it a sign-in button drew as a bare link (phone sweep, 2026-11-01). It is scoped to its own sc- classes. -->
++${[...new Set(['showcase.css', ...(o.styles || [])])].map((name) => `<link rel="stylesheet" href="${esc(ovServe.url(name))}">`).join('\n')}
  ${render(scripts)}
  <meta name="ov-boost" content="quest@${esc(RELEASE)}">
  <script src="${ovServe.url('boost.js')}" data-main="#main" defer></script>`,