fix(header): align publish and VIP CTAs with reference theme

The top-nav publish chip and open-membership chip carried an AKSRT-only
class layer (navbar-cta / navbar-cta-text / navbar-newposts /
navbar-vip-hover) plus a matching set of CSS overrides that replaced the
legacy .but geometry: margin 0.4em -> 0, an extra min-height and flex gap,
an FA5 pencil glyph that is not the reference pencil, and label text
wrapped in a span. The VIP hover card also had its own positioning
override instead of the reference static position.

Drop that layer and emit the reference class combination verbatim so the
already byte-identical legacy stylesheet owns the geometry again:

- publish chip renders newadd-btns but nowave <skin> [radius] btn-newadd
  with the label echoed as saved (no injected icon, no span)
- VIP chip renders pay-vip|signin-loader but jb-red radius payvip-icon
  with the vip_1 SVG at em12 mr3, inside span.hover-show.inline-block
- user-card CTA uses the vip_1 SVG (em12 mr6) instead of fa-gem and drops
  vip-level, matching zib_get_header_payvip_icon()
- both buttons now honour Settings::close_sign(), matching the reference
  zib_is_close_sign() gate and the floating publish button
- header-userbox.css keeps one rule that restores the hover wrapper to a
  plain block container so .sub-vip-card takes its reference static
  position; every other override is gone
- nav_newposts_text default drops the duplicated fas and uses the FA5
  spelling of the reference pencil (fa-pencil-alt, not fa-pen)

Dead code removed: aksrt_normalize_header_cta_label(), the unreachable
multi-type dropdown branch of aksrt_render_new_add_btns() (only 'post' is
supported and only ['post'] is ever passed), and the
newadd-btns__toggle / newadd-btns__item / drop-newadd markup it emitted.

ml10 is no longer set on the VIP anchor: .aksrt-navbar-actions already
supplies the 10px gap the reference gets from ml10, and keeping both
would double it to 20px.

No migration for sites that already stored the old nav_newposts_text.

Verified: node --test across tests/ (603 passing), php -l on the changed
PHP files, and a stubbed render of every publish/VIP branch.

assets/css/frontend/header-userbox.css

@@ -50,29 +50,6 @@
   float: none;
 }
 
-.navbar-top .aksrt-navbar-actions .navbar-cta {
-  display: inline-flex;
-  align-items: center;
-  justify-content: center;
-  gap: 4px;
-  min-height: 29px;
-  margin: 0;
-  padding: .3em 1em !important;
-  border-radius: var(--radius-btn, 4px);
-  font-size: .8em;
-  line-height: 1.44;
-}
-
-.navbar-top .aksrt-navbar-actions .navbar-cta.radius {
-  border-radius: 50px;
-}
-
-.navbar-top .aksrt-navbar-actions .navbar-cta > .icon {
-  width: 1.2em;
-  height: 1.2em;
-  flex: 0 0 auto;
-}
-
 .navbar-top .aksrt-nav-icon,
 .navbar-top .aksrt-nav-avatar {
   display: inline-flex !important;
@@ -115,23 +92,12 @@
   margin: 0;
 }
 
-/* Anchor the VIP preview to the full navigation row instead of relying on
- * the absolute panel's static position beside the compact CTA. */
-.navbar-top .aksrt-navbar-actions .navbar-vip-hover {
-  position: relative;
-  align-self: stretch;
-  align-items: center;
-  overflow: visible;
-}
-
-.navbar-top .aksrt-navbar-actions .navbar-vip-hover > .sub-vip-card {
-  top: 100%;
-  right: 0;
-  left: auto;
-  width: max-content;
-  max-width: calc(100vw - 24px);
-  margin: 0;
-  z-index: 1002;
+/* The reference keeps the publish/VIP hover wrapper a plain inline-block, so the
+ * absolutely positioned .sub-vip-card takes its normal-flow static position.
+ * The shared action cluster otherwise forces inline-flex on every child, which
+ * would move that static position to the flex container's cross-start. */
+.navbar-top .aksrt-navbar-actions > .hover-show {
+  display: inline-block;
 }
 
 /* Keep the drop-down search panel above a fixed header (z-index: 999). */