fix(nav): use reference theme sprite icons for header wallet tiles

The top-nav user card rendered its balance and points tiles with Font Awesome
glyphs (fa-money-bill-wave, fa-coins) while the reference theme paints the
multi-tone SVGs money-color-2 and points-color, so the two tiles read as flat
monochrome next to the rest of the card.

aksrt_header_user_wallet_mini() now resolves both value icons through
aksrt_icon_markup(), which is the same call the user-center sidebar uses for
the same two figures, so the header and the sidebar cannot drift apart:

  余额  fa-money-bill-wave -> zibsvg-money-color-2 (em14)
  积分  fa-coins          -> zibsvg-points-color  (em14)

The tile arrows stay on fa-angle-right because that is what the reference
renders there; only the two value icons were wrong. The muted-box geometry, the
c-blue-2 / c-yellow value colours and the data-aksrt-* live-update hooks are
untouched.

Verification: node --test across widget-system, navigation, admin,
asset-ledger, dev, front-submit and fixtures (621 tests), plus php -l. Rendered
the tile through a stubbed harness and diffed it against the reference markup:
identical structure, classes and icon. Contract-locked the two keys in
tests/navigation/legacy-navigation-contract.test.cjs and added a cross-surface
parity assertion to the sidebar icon contract.

tests/widget-system/user-center-sidebar-icons-contract.test.cjs

@@ -115,3 +115,18 @@ test('所用 sprite key 均在前端 sprite 中定义', () => {
     assert.match(sprite, new RegExp(`aksrt_svgs\\['${key}'\\]\\s*=`), `sprite key missing: ${key}`);
   }
 });
+
+test('导航栏用户浮层的余额/积分磁贴与侧栏使用同一组 sprite key', () => {
+  const nav = read(sidebarDir + 'sidebar-commerce.php');
+  const wallet = read('inc/helpers/aksrt-header-userbox.php');
+
+  assert.match(wallet, /aksrt_icon_markup\('zibsvg-money-color-2', 'em14'\)/);
+  assert.match(wallet, /aksrt_icon_markup\('zibsvg-points-color', 'em14'\)/);
+  assert.match(nav, /aksrt_icon_markup\('zibsvg-money-color-2'\)/);
+  assert.match(nav, /aksrt_icon_markup\('zibsvg-points-color'\)/);
+
+  // 磁贴箭头沿用参考主题的 fa-angle-right，不做多余替换。
+  assert.match(wallet, /fa fas fa-angle-right em12/);
+  assert.doesNotMatch(wallet, /fa fas fa-money-bill-wave/);
+  assert.doesNotMatch(wallet, /fa fas fa-coins/);
+});