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/pages/page-user-home.php

@@ -61,7 +61,7 @@ require_once JIO_DIR . '/templates/parts/user-shared-helpers.php';
 						?>
 								<button type="button" class="<?php echo esc_attr(trim($tab_class)); ?>" data-tab="<?php echo esc_attr($tab_key); ?>" role="tab">
 									<?php echo esc_html($tab_labels[$tab_key] ?? ucfirst($tab_key)); ?>
-									<span class="dashboard-tabs__count opacity8"><?php echo esc_html((string) $tab_count); ?></span>
+									<span class="dashboard-tabs__count opacity8"<?php echo $tab_key === 'follow' ? ' data-follow-count="followers"' : ''; ?>><?php echo esc_html((string) $tab_count); ?></span>
 								</button>
 						<?php endforeach; ?>
 					</div>