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.

src/Admin/Schema/SchemaPageDisplay.php

@@ -53,7 +53,7 @@ class SchemaPageDisplay {
 			self::field('nav_newposts', 'Add发布按钮', 'switcher', true, ['description' => '顶部导航显示文章投稿按钮。']),
 			self::field('nav_newposts_radius', '按钮圆角', 'switcher', true, ['dependsOn' => self::enabled('nav_newposts')]),
 			self::field('nav_newposts_class', '按钮颜色', 'palette', 'jb-blue', ['dependsOn' => self::enabled('nav_newposts'), 'options' => self::aksrt_palette()]),
-			self::field('nav_newposts_text', '按钮文案', 'textarea', '<i class="fa fas fa-fw fas fa-pencil-alt"></i>发布', ['dependsOn' => self::enabled('nav_newposts'), 'sanitize_type' => 'html', 'rows' => 1]),
+			self::field('nav_newposts_text', '按钮文案', 'textarea', '<i class="fa fas fa-fw fa-pencil-alt"></i>发布', ['dependsOn' => self::enabled('nav_newposts'), 'sanitize_type' => 'html', 'rows' => 1]),
 		]);
 	}