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/navigation/legacy-navigation-contract.test.cjs

@@ -246,13 +246,18 @@ test('the account popover rows match the reference user box structure', () => {
   assert.match(header, /admin\.php\?page=aksrt_pay/);
   assert.match(header, /支付中心/);
 
-  // Wallet tiles: balance first, muted-box geometry, FA5 icons.
+  // Wallet tiles: balance first, muted-box geometry, reference sprite icons.
   assert.match(header, /class="flex ab jsb col-ml6"/);
   assert.match(header, /muted-box padding-6 flex1 radius4/);
   assert.match(header, /font-bold c-blue-2/);
   assert.match(header, /font-bold c-yellow/);
-  assert.match(header, /fa fas fa-money-bill-wave em14 c-blue-2/);
-  assert.match(header, /fa fas fa-coins em14 c-yellow/);
+  assert.match(header, /aksrt_icon_markup\('zibsvg-money-color-2', 'em14'\)/);
+  assert.match(header, /aksrt_icon_markup\('zibsvg-points-color', 'em14'\)/);
+  // The value icons are the reference theme's multi-tone SVGs, not FA5 glyphs;
+  // the tile arrow stays on fa-angle-right exactly as the reference renders it.
+  assert.doesNotMatch(header, /fa fas fa-money-bill-wave/);
+  assert.doesNotMatch(header, /fa fas fa-coins/);
+  assert.match(header, /fa fas fa-angle-right em12/);
 
   // Message icon uses the reference markup.
   assert.match(header, /msg-news-icon abs-right/);