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.

inc/helpers/aksrt-header-userbox.php

@@ -230,11 +230,11 @@ if (!function_exists('aksrt_header_payvip_bar')) :
 			return '';
 		}
 
-		// 几何对齐参考主题 CTA（通栏、radius4）——不是顶导 navbar-cta chips。
+		// 1:1 对齐参考主题 zib_get_header_payvip_icon()：通栏、radius4、vip_1 SVG 图标、裸文案。
 		return '<div class="mt10 em09" style="padding:2px;">'
-			. '<a class="pay-vip but radius4 payvip-icon btn-block" href="javascript:;" vip-level="1">'
-			. '<i class="fa fas fa-gem em12 mr6" aria-hidden="true"></i>'
-			. '<span>' . esc_html__('开通会员 尊享会员权益', 'aksrt') . '</span>'
+			. '<a class="pay-vip but radius4 payvip-icon btn-block" href="javascript:;">'
+			. '<svg class="em12 mr6" aria-hidden="true"><use xlink:href="#icon-vip_1"></use></svg>'
+			. esc_html__('开通会员 尊享会员权益', 'aksrt')
 			. '</a></div>';
 	}
 endif;