feat(nav): finish remaining parity gaps (image_select, AJAX search, senior UI)

- Layout image_select previews (zibll PNGs under assets/images/header-layout)
- Localize aksrtAdminData.themeUri for admin SPA asset URLs
- Layout-2 inline search AJAX suggestions via aksrt_search_suggestions
- Appearance→Menus visual senior submenu editor (cards/columns)
- Acceptance checklist + automated source contract report

tools/nav-zibll-acceptance.md

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+# Top nav zibll 1:1 acceptance checklist
+
+Branch: `worktree-nav-zibll-1to1`
+
+## Desktop
+- [ ] Layout 1: logo | menu | publish/VIP | theme(+lang) | user | search icon
+- [ ] Layout 2: logo | menu | inline search(+hot/suggest) | CTAs | user (no search icon)
+- [ ] Layout 3: logo | CTAs/user | menu right cluster
+- [ ] Fixed `body.nav-fixed` 88px reserve; hero show-slide pull-up
+- [ ] Scroll-down hide / scroll-up show
+- [ ] Submenu hover + chevron; overflow folding "更多"
+- [ ] Publish single vs multi; VIP hover cards gated by switches
+- [ ] User box density + user-card publish type URL
+- [ ] Header theme colors when custom enabled
+- [ ] Language dropdown when i18n enabled + position header/both
+
+## Mobile
+- [ ] center/left header; drawer left/right/top
+- [ ] `body.mobile-navbar-show` open/close + fixed-body + swipe
+- [ ] mobile menus depth 2 + user box + widgets
+- [ ] posts-nav-box TOC on single posts
+
+## Admin
+- [ ] SPA image_select previews for layouts
+- [ ] newposts types multi + VIP switches persist
+- [ ] Appearance → Menus: icon/badge/senior visual editor saves meta
+- [ ] `cd assets/admin && npm run build` after schema changes
+
+## Page/section navs
+- [ ] section-navs builds `.posts-nav-lists` on `[data-nav]` pages
+- [ ] page-navs enqueued on posts-navs template
+
+## Deploy notes
+- Admin `build/` is gitignored — run build on deploy host.
+- PR: open from branch `worktree-nav-zibll-1to1` against main on Gitea.

tools/nav-zibll-contract-report.txt

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+PASS all nav zibll source contracts