Transpile dom.sx + browser.sx into bundle; add FFI variable aliases

dom-lib and browser-lib were listed in ADAPTER_FILES but never actually
transpiled — their functions only existed as native PLATFORM_*_JS code.
Add them to the build loop so the FFI library wrappers are compiled.
Add hostCall/hostGet/etc. variable aliases for transpiled code, and
console-log to browser.sx for runtime-eval'd SX code.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

web/lib/browser.sx

@@ -166,6 +166,11 @@
   (fn (msg)
     (host-call (host-global "console") "warn" (str "[sx] " msg))))
 
+(define console-log
+  (fn (&rest args)
+    (host-call (host-global "console") "log"
+      (join " " (cons "[sx]" (map str args))))))
+
 (define now-ms
   (fn ()
     (host-call (host-global "Date") "now")))