Fix: preload every 20 items, episode number sequence, search stability

tvmon-app/app/src/main/java/com/example/tvmon/data/scraper/TvmonScraper.kt

@@ -420,6 +420,8 @@ val episodes = mutableListOf<Episode>()
             "a[href*='/$seriesId/'], a[href*='/${seriesId}/']"
         )
 
+        var episodeIndex = 0
+
         for (link in allEpisodeLinks) {
             val href = link.attr("href")
             if (href.isBlank()) continue
@@ -443,7 +445,12 @@ val episodes = mutableListOf<Episode>()
                 null
             }
 
-            val finalNumber = episodeTitle ?: episodeId
+            val finalNumber = if (!episodeTitle.isNullOrBlank()) {
+                episodeTitle
+            } else {
+                episodeIndex++.toString()
+            }
+            
             if (finalNumber in seenNumbers) continue
             seenNumbers.add(finalNumber)
 

tvmon-app/app/src/main/java/com/example/tvmon/ui/main/MainFragment.kt

@@ -111,6 +111,7 @@ private fun handleRowSelection(position: Int) {
 
     private fun preloadNextPage(categoryKey: String, page: Int) {
         if (categoryLoading[categoryKey] == true) return
+        if (categoryPages[categoryKey] ?: 0 >= page) return
         categoryLoading[categoryKey] = true
 
         lifecycleScope.launch {
@@ -322,16 +323,14 @@ private fun loadNextPage(categoryKey: String, page: Int) {
     }
 
     private fun checkAndPreload(categoryKey: String, position: Int) {
-        if (position >= PRELOAD_THRESHOLD) {
-            val currentPage = categoryPages[categoryKey] ?: 1
-            val maxPage = categoryMaxPage[categoryKey] ?: 1
-            val lastPreload = lastPreloadedPage[categoryKey] ?: 0
-
-            if (currentPage < maxPage && currentPage > lastPreload) {
-                Log.w(TAG, "checkAndPreload: $categoryKey at position $position, preloading page ${currentPage + 1}")
-                lastPreloadedPage[categoryKey] = currentPage
-                preloadNextPage(categoryKey, currentPage + 1)
-            }
+        val currentPage = categoryPages[categoryKey] ?: 1
+        val maxPage = categoryMaxPage[categoryKey] ?: 1
+        
+        val thresholdPage = (position / PRELOAD_THRESHOLD) + 1
+        
+        if (thresholdPage > currentPage && thresholdPage <= maxPage) {
+            Log.w(TAG, "checkAndPreload: $categoryKey at position $position, preloading page $thresholdPage")
+            preloadNextPage(categoryKey, thresholdPage)
         }
     }
 }