Fix bootstrapper dict literal transpilation: emit values through emit()

The SX parser produces native Python dicts for {:key val} syntax, but
both JSEmitter and PyEmitter had no dict case in emit() — falling through
to str(expr) which output raw AST. This broke client-side routing because
process-page-scripts used {"parsed" (parse-route-pattern ...)} and the
function call was emitted as a JS array of Symbols instead of an actual
function call.

Add _emit_native_dict() to both bootstrappers + 8 unit tests.

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

shared/static/scripts/sx-browser.js

@@ -2419,7 +2419,7 @@ callExpr.push(dictGet(kwargs, k)); } }
   var text = domTextContent(s);
   return (isSxTruthy((isSxTruthy(text) && !isEmpty(trim(text)))) ? (function() {
   var pages = parse(text);
-  return forEach(function(page) { return append_b(_pageRoutes, merge(page, {'parsed': [Symbol('parse-route-pattern'), [Symbol('get'), Symbol('page'), 'path']]})); }, pages);
+  return forEach(function(page) { return append_b(_pageRoutes, merge(page, {"parsed": parseRoutePattern(get(page, "path"))})); }, pages);
 })() : NIL);
 })()) : NIL); }, scripts);
 })(); };
@@ -3780,4 +3780,4 @@ callExpr.push(dictGet(kwargs, k)); } }
   if (typeof module !== "undefined" && module.exports) module.exports = Sx;
   else global.Sx = Sx;
 
-})(typeof globalThis !== "undefined" ? globalThis : typeof window !== "undefined" ? window : this);
+})(typeof globalThis !== "undefined" ? globalThis : typeof window !== "undefined" ? window : this);