UI pass: nav state, ears, feeds table, font flash, faster navigation

- Issue pages highlight Archive instead of Latest unless the issue is the
  newest one (IssueView::is_latest), with a router test.
- The ears row is empty by default and says "Dashboard" on dashboard pages;
  "Morning edition" only survives on the empty-state hero.
- Run page: the Feeds card table is fixed-layout and truncates long feed
  names with the full title on hover instead of pushing the entries column
  out of the card.
- Static assets are content-hashed, so serve them immutable for a year;
  preload both Newsreader faces and use font-display: block so a cache
  revalidation never paints the fallback serif first. Persisted details
  state is restored pre-paint from theme.js.
- Cross-document view transitions (140 ms fade, masthead held still) and
  Speculation Rules (prerender reader pages, prefetch dashboard pages on
  hover) served from /static/speculation.json via the Speculation-Rules
  header, which the CSP would otherwise block inline. No client router.
- Dashboard nav gets the same accent underline as the site nav; 40 px
  targets for the theme toggle, account link and dashboard nav.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01MD4VWGq6mGcd8Bg67qyx9k

src/web/static/app.js

@@ -109,7 +109,13 @@ document.addEventListener("click", (event) => {
 /* step 6: reload a job page every N seconds while its job is requested/running */
 document.querySelectorAll("[data-refresh]").forEach((element) => {
   const seconds = Number(element.dataset.refresh);
-  if (seconds > 0) setTimeout(() => window.location.reload(), seconds * 1000);
+  if (seconds <= 0) return;
+  const schedule = () => setTimeout(() => window.location.reload(), seconds * 1000);
+  if (document.prerendering) {
+    document.addEventListener("prerenderingchange", schedule, { once: true });
+  } else {
+    schedule();
+  }
 });
 /* step 4: table-of-contents panel (below `lg`) and reading-progress bar */
 const tocPanel = document.querySelector("[data-toc-panel]");