Add s-expression wire format support and test detail view

- HTMX beforeSwap hook intercepts text/sexp responses and renders
  them client-side via sexp.js before HTMX swaps the result in
- sexp_response() helper for returning text/sexp from route handlers
- Test detail page (/test/<nodeid>) with clickable test names
- HTMX navigation to detail returns sexp wire format (4x smaller
  than pre-rendered HTML), full page loads render server-side
- ~test-detail component with back link, outcome badge, and
  error traceback display

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

test/bp/dashboard/routes.py

@@ -48,6 +48,32 @@ def register(url_prefix: str = "/") -> Blueprint:
         from quart import redirect as qredirect
         return qredirect("/")
 
+    @bp.get("/test/<path:nodeid>")
+    async def test_detail(nodeid: str):
+        """Test detail view — full page or sexp wire format."""
+        import runner
+
+        test = runner.get_test(nodeid)
+        if not test:
+            from quart import abort
+            abort(404)
+
+        is_htmx = bool(request.headers.get("HX-Request"))
+
+        if is_htmx:
+            # S-expression wire format — sexp.js renders client-side
+            from shared.sexp.helpers import sexp_response
+            from sexp.sexp_components import test_detail_sexp
+            return sexp_response(test_detail_sexp(test))
+
+        # Full page render (direct navigation / refresh)
+        from shared.sexp.page import get_template_context
+        from sexp.sexp_components import render_test_detail_page
+
+        ctx = await get_template_context()
+        html = await render_test_detail_page(ctx, test)
+        return await make_response(html, 200)
+
     @bp.get("/results")
     async def results():
         """HTMX partial — poll target for results table."""