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/templates/dashboard/run.html

@@ -35,7 +35,7 @@
 <section class="card"><h2>Timings</h2><div class="scroll-x"><table><thead><tr><th>stage</th><th class="num">seconds</th></tr></thead><tbody>{% for line in timings %}<tr><td>{{ line.stage }}</td><td class="num">{{ line.seconds }}</td></tr>{% endfor %}<tr><th>total</th><th class="num">{{ timings_total }}</th></tr></tbody></table></div></section>
 <section class="card"><h2>Provider usage</h2><div class="scroll-x"><table><thead><tr><th>provider</th><th class="num">in</th><th class="num">cached</th><th class="num">cache write</th><th class="num">out</th><th class="num">cost</th></tr></thead><tbody>{% for line in providers %}<tr><td>{{ line.provider }}</td><td class="num">{{ line.input }}</td><td class="num">{{ line.cached }}</td><td class="num">{{ line.cache_write }}</td><td class="num">{{ line.output }}</td><td class="num">{{ line.cost }}</td></tr>{% endfor %}</tbody></table></div></section>
 <section class="card" id="warnings"><h2>Warnings</h2>{% if warnings.is_empty() %}<p class="muted">None.</p>{% else %}<ul class="list-disc pl-5 text-warn">{% for warning in warnings %}<li>{{ warning }}</li>{% endfor %}</ul>{% endif %}</section>
-<section class="card"><h2>Feeds (top {{ feeds.len() }})</h2><div class="scroll-x"><table><thead><tr><th>feed</th><th class="num">entries</th></tr></thead><tbody>{% for line in feeds %}<tr><td>{{ line.name }}</td><td class="num">{{ line.count }}</td></tr>{% endfor %}</tbody></table></div></section>
+<section class="card"><h2>Feeds (top {{ feeds.len() }})</h2><div><table class="table-fixed"><thead><tr><th>feed</th><th class="num w-20">entries</th></tr></thead><tbody>{% for line in feeds %}<tr><td class="truncate" title="{{ line.name }}">{{ line.name }}</td><td class="num w-20">{{ line.count }}</td></tr>{% endfor %}</tbody></table></div></section>
 </div>{% else %}<p class="muted text-sm">This run has no stored report; only the funnel and candidates are available.</p>{% endif %}
 
 <h2>Config diff</h2>