Fix CSS styles lost during SPA navigation

The text/sx AJAX response path (handle-sx-response) never called
hoist-head-elements, so <style> elements stayed in #sx-content instead
of moving to <head>. Additionally, CSS rules collected during client-side
island hydration were never flushed to the DOM.

- Add hoist-head-elements call to handle-sx-response (matching
  handle-html-response which already had it)
- Add flush-collected-styles helper that drains collected CSS rules
  into a <style data-sx-css> element in <head>
- Call flush after island hydration in post-swap, boot-init, and
  run-post-render-hooks to catch reactive re-renders
- Unify on data-sx-css attribute (existing convention) in ~tw/flush
  and shell template, removing the ad-hoc data-cssx attribute

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
This commit is contained in:
2026-04-02 09:37:58 +00:00
parent 1098dd3794
commit 670295bf01
7 changed files with 1192 additions and 1377 deletions

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@@ -433,6 +433,7 @@
(run-post-render-hooks)
(flush-collected-styles)
(set-timeout (fn () (process-elements nil)) 0)
(dom-listen (dom-window) "popstate" (fn (e) (handle-popstate 0)))
(dom-set-attr
(host-get (dom-document) "documentElement")
"data-sx-ready"

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@@ -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-319ce79b",[2]],["jsoo_runtime-f96b44a8",[2]],["js_of_ocaml-651f6707",[2,4]],["dune__exe__Sx_browser-8ae21d0a",[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