Uncommitted sx-tools changes: WASM bundles, Playwright specs, engine fixes

WASM browser bundles rebuilt with latest kernel. Playwright test specs
updated (helpers, navigation, handler-responses, hypermedia-handlers,
isomorphic, SPA navigation). Engine/boot/orchestration SX files updated.
Handler examples and not-found page refreshed.

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

shared/static/wasm/sx/boot-helpers.sx

@@ -358,7 +358,39 @@
                   content
                   (dom-set-inner-html main (host-get content "innerHTML"))
                   (dom-set-inner-html main text)))
-              (dom-set-inner-html main text)))
+              (let
+                ((container (dom-create-element "div")))
+                (let
+                  ((rendered (sx-render text)))
+                  (when
+                    rendered
+                    (dom-append container rendered)
+                    (process-oob-swaps
+                      container
+                      (fn
+                        (t oob (s :as string))
+                        (dispose-islands-in t)
+                        (swap-dom-nodes
+                          t
+                          (if
+                            (= s "innerHTML")
+                            (children-to-fragment oob)
+                            oob)
+                          s)
+                        (post-swap t)))
+                    (let
+                      ((content (select-from-container container "#sx-content")))
+                      (if
+                        content
+                        (do
+                          (dispose-islands-in main)
+                          (dom-set-inner-html main "")
+                          (dom-append main content))
+                        (do
+                          (dispose-islands-in main)
+                          (dom-set-inner-html
+                            main
+                            (dom-get-inner-html container))))))))))
           (post-swap main)
           (host-call (dom-window) "scrollTo" 0 scroll-y)))
       (fn (err) (log-warn (str "fetch-and-restore error: " err))))))

shared/static/wasm/sx/engine.sx

@@ -361,9 +361,14 @@
         (=
           (dom-get-attr old-node "data-sx-island")
           (dom-get-attr new-node "data-sx-island")))
-      (do
+      (let
+        ((old-state (dom-get-attr old-node "data-sx-state"))
+          (new-state (dom-get-attr new-node "data-sx-state")))
         (sync-attrs old-node new-node)
-        (morph-island-children old-node new-node))
+        (if
+          (and new-state (not (= old-state new-state)))
+          (do (dispose-island old-node) (hydrate-island old-node))
+          (morph-island-children old-node new-node)))
       (or
         (not (= (dom-node-type old-node) (dom-node-type new-node)))
         (not (= (dom-node-name old-node) (dom-node-name new-node))))

shared/static/wasm/sx/orchestration.sx

@@ -572,9 +572,7 @@
         (and settle-expr (not (empty? settle-expr)))
         (let
           ((exprs (sx-parse settle-expr)))
-          (for-each
-            (fn (expr) (eval-expr expr (env-extend (dict))))
-            exprs))))))
+          (for-each (fn (expr) (cek-eval expr)) exprs))))))
 
 (define
   activate-scripts
@@ -1585,12 +1583,9 @@
         (pathname (url-pathname url)))
       (when
         target
-        (if
-          (try-client-route pathname target-sel)
-          (browser-scroll-to 0 scrollY)
-          (let
-            ((headers (dict "SX-History-Restore" "true")))
-            (fetch-and-restore target url headers scrollY)))))))
+        (let
+          ((headers (dict "SX-Request" "true")))
+          (fetch-and-restore target url headers scrollY))))))
 
 (define
   engine-init

shared/static/wasm/sx_browser.bc.wasm.js

@@ -1792,7 +1792,7 @@
             blake2_js_for_wasm_create: blake2_js_for_wasm_create};
    }
    (globalThis))
-({"link":[["runtime-0db9b496",0],["prelude-d7e4b000",0],["stdlib-23ce0836",[]],["sx-69cfbc7f",[2]],["jsoo_runtime-f96b44a8",[2]],["js_of_ocaml-651f6707",[2,4]],["dune__exe__Sx_browser-9ecd0d53",[2,3,5]],["std_exit-10fb8830",[2]],["start-80fdb768",0]],"generated":(b=>{var
+({"link":[["runtime-0db9b496",0],["prelude-d7e4b000",0],["stdlib-23ce0836",[]],["sx-de8114db",[2]],["jsoo_runtime-f96b44a8",[2]],["js_of_ocaml-651f6707",[2,4]],["dune__exe__Sx_browser-9ecd0d53",[2,3,5]],["std_exit-10fb8830",[2]],["start-80fdb768",0]],"generated":(b=>{var
 c=b,a=b?.module?.export||b;return{"env":{"caml_ba_kind_of_typed_array":()=>{throw new
 Error("caml_ba_kind_of_typed_array not implemented")},"caml_exn_with_js_backtrace":()=>{throw new
 Error("caml_exn_with_js_backtrace not implemented")},"caml_int64_create_lo_mi_hi":()=>{throw new