fix(user-center): use the reference colour sprites on the balance and points cards

Both asset cards opened with the same solid `fa-money-bill` glyph, so the
wallet and the points card showed an identical icon and neither matched the
reference, which pairs a blue wallet mark with the balance card and an orange
coin mark with the points card.

The theme already ships both sprites — the header wallet popover and the user
center sidebar resolve to `jiosvg-money-color-2` and `jiosvg-points-color`
through the same helper. Only these two cards were still on Font Awesome.
Swapping them keeps one icon family across the user center; the existing
`em12 mr6` sizing carries over unchanged because `svg` is 1em tall.

The wallet/points icon contract test now pins both keys and fails if either
card falls back to `fa-money-bill` or `fa-coins`.

Verification: rendered both cards through a PHP stub and screenshotted them
against the real theme stylesheet — the blue wallet and orange coin render at
the same optical size as the labels. 861 widget/navigation tests pass.

inc/helpers/user-center-renderers/credits-balance.php

@@ -32,7 +32,7 @@ $points_signin_label   = sprintf(__('签到领%s', 'jio'), $currency);
 <div class="uc-asset-card uc-asset-card--points">
 	<div class="uc-asset-card__head flex jsb ac">
 		<div class="uc-asset-card__title">
-			<i class="fa fas fa-money-bill em12 mr6" aria-hidden="true"></i><?php echo esc_html($currency); ?>
+			<?php echo function_exists('jio_icon_markup') ? jio_icon_markup('jiosvg-points-color', 'em12 mr6') : ''; // phpcs:ignore WordPress.Security.EscapeOutput.OutputNotEscaped ?><?php echo esc_html($currency); ?>
 		</div>
 		<?php if (!empty($signin_enabled)) : ?>
 		<span class="uc-asset-card__head-action muted-color px12" data-jio-signin>

inc/helpers/user-center-renderers/credits-wallet.php

@@ -66,7 +66,7 @@ $mark = (string) ($charge_view['currency_mark'] ?? '元');
 <div class="uc-asset-card uc-asset-card--wallet">
 	<div class="uc-asset-card__head flex jsb ac">
 		<div class="uc-asset-card__title">
-			<i class="fa fas fa-money-bill em12 mr6" aria-hidden="true"></i><?php esc_html_e('余额', 'jio'); ?>
+			<?php echo function_exists('jio_icon_markup') ? jio_icon_markup('jiosvg-money-color-2', 'em12 mr6') : ''; // phpcs:ignore WordPress.Security.EscapeOutput.OutputNotEscaped ?><?php esc_html_e('余额', 'jio'); ?>
 		</div>
 		<?php if ($withdraw_on) : ?>
 			<button type="button" class="uc-asset-card__head-action muted-color px12" data-jio-withdraw-history-open>