Stable per-branch report URLs and a reachable live view (v0.9.8)

A report directory holding a single page is now linked and served as a
directory, so Gradle's --profile report has a stable permanent URL although
its file name carries the build timestamp.

The permanent link moves to the build it resolves to — the branch's latest
green build — and appears on every build table instead of only the branches
view. The Current tab gave way to a link in the artifacts column, shown
while a build runs; /current itself stays routable.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

src/main/resources/templates/fragments.html

@@ -26,7 +26,6 @@
         <span th:if="${view == 'history'}">History</span>
         <a th:unless="${view == 'history'}" href="/history">History</a>
         <span th:if="${view == 'current'}">Current</span>
-        <a th:unless="${view == 'current'}" href="/current">Current</a>
         <span th:if="${view == 'system'}">System</span>
         <a th:unless="${view == 'system'}" href="/system">System</a>
     </nav>