feat(reading/index.php.liquid): update reading progress on page load

app/Classes/BookProgressHandler.php

@@ -0,0 +1,41 @@
+<?php
+
+namespace App\Classes;
+
+class BookProgressHandler extends BaseHandler
+{
+    protected int $cacheTTL = 300;
+
+    public function getAllProgress(): array
+    {
+        try {
+            $cacheKey = 'all_books_progress';
+
+            if ($this->cache) {
+                $cached = $this->cache->get($cacheKey);
+                if ($cached !== false) {
+                    return json_decode($cached, true) ?? [];
+                }
+            }
+
+            $response = $this->makeRequest('GET', 'optimized_books_progress?select=isbn,progress');
+            $result = [];
+
+            foreach ($response as $row) {
+                if (!empty($row['isbn'])) {
+                    $result[$row['isbn']] = (int) $row['progress'];
+                }
+            }
+
+            if ($this->cache) {
+                $this->cache->set($cacheKey, json_encode($result), $this->cacheTTL);
+            }
+
+            return $result;
+        } catch (\Throwable $e) {
+            error_log('BookProgressHandler::getAllProgress error: ' . $e->getMessage());
+            return [];
+        }
+    }
+
+}