feat(nav): close P0/P1 parity gaps (nav style, history, plate, admin build)

Wire header_nav_style transparent/blur, login history sync, plate publish
type, clean dead search CSS, rebuild admin SPA locally (build gitignored).

tools/nav-zibll-acceptance.md

@@ -40,3 +40,14 @@ Branch: `worktree-nav-zibll-full-1to1`
 
 ## Contract report
 - `tools/nav-zibll-contract-report.txt` should list search DOM PASS after smoke.
+
+
+## Code-complete (browser QA still manual)
+The following are implemented in code; remaining checkboxes above need live WP QA:
+- menu_search zibll DOM + remote-box
+- L1/3 `.navbar-search` slide + toggle isolation
+- `header_nav_style` transparent/blur classes + CSS
+- unified `header_newposts_enabled` + plate type + jb skin
+- user box admin 4-row
+- logged-in history AJAX save on top search submit
+- admin `npm run build` executed in this worktree