feat(single): align author bar follow and reward actions with the site flows

- guests get the sign-in trigger instead of a redirect to the login page,
  for both follow and wallet reward controls
- follow requests swap the label for an inline loader and block a second
  submit; the followed state uses the .actived hook
- follower counts sync through data-follow-count on the user homepage
  (the previous selector matched nothing) and only for the viewed profile
- reward button uses the secondary action colour; the reward template is
  only rendered for signed-in visitors
- drop the unused author-hero aria-disabled rule and stale wording in the
  touched comments

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

templates/parts/user-home/panel-follow.php

@@ -47,7 +47,7 @@ $total_pages = max(1, (int) ($list['total_pages'] ?? 1));
 	<li>
 		<button type="button" class="uh-follow__subtab<?php echo $follow_sub === 'followers' ? ' is-active focus-color' : ' muted-color'; ?>" data-uh-sub="followers">
 			<?php esc_html_e('粉丝', 'jio'); ?>
-			<span class="uh-follow__subtab-count"><?php echo esc_html((string) $follower_count); ?></span>
+			<span class="uh-follow__subtab-count" data-follow-count="followers"><?php echo esc_html((string) $follower_count); ?></span>
 		</button>
 	</li>
 	<li>