修复: Bing壁纸浏览方向改为旧到新并保最新2000张

- 历史排序改为日期升序, 左键更旧右键更新, 位置显示 idx+1/total
- 修复排序翻转后裁剪逻辑误删最新图的问题, 改为淘汰最旧
- dislike跳过与定时切换同步改为向更新方向推进

bing.go

@@ -315,23 +315,24 @@ func fetchBingHistory() {
 		allMap[k] = r
 	}
 
-	// Sort by date descending, then by market for determinism
+	// Sort by date ascending (oldest first), so index 0 = oldest, index N = newest
+	// Left-to-right navigation: left = older (smaller idx), right = newer (larger idx)
 	var records []BingRecord
 	for _, r := range allMap {
 		records = append(records, r)
 	}
 	sort.Slice(records, func(i, j int) bool {
 		if records[i].Date != records[j].Date {
-			return records[i].Date > records[j].Date
+			return records[i].Date < records[j].Date
 		}
 		return records[i].Market < records[j].Market
 	})
 
 	// ---- Phase 3: Enforce 2000 cap ----
 	if len(records) > maxBingRecords {
-		// Remove oldest records and their files
-		toRemove := records[maxBingRecords:]
-		records = records[:maxBingRecords]
+		// Records sorted oldest-first, so oldest are at the head
+		toRemove := records[:len(records)-maxBingRecords]
+		records = records[len(records)-maxBingRecords:]
 		for _, r := range toRemove {
 			p := filepath.Join(bingDir(), r.Filename)
 			os.Remove(p)
@@ -380,6 +381,7 @@ func getCurrentBingRecord() *BingRecord {
 }
 
 // bingPrev moves to the previous (older) image, skipping hidden ones.
+// Records sorted oldest-first, so prev = decrement index.
 func bingPrev() {
 	bingMu.Lock()
 	defer bingMu.Unlock()
@@ -390,7 +392,7 @@ func bingPrev() {
 	}
 	attempts := 0
 	for {
-		h.CurrentIdx = (h.CurrentIdx + 1) % len(h.Records)
+		h.CurrentIdx = (h.CurrentIdx - 1 + len(h.Records)) % len(h.Records)
 		if !h.Records[h.CurrentIdx].Hidden {
 			break
 		}
@@ -405,6 +407,7 @@ func bingPrev() {
 }
 
 // bingNext moves to the next (newer) image, skipping hidden ones.
+// Records sorted oldest-first, so next = increment index.
 func bingNext() {
 	bingMu.Lock()
 	defer bingMu.Unlock()
@@ -415,7 +418,7 @@ func bingNext() {
 	}
 	attempts := 0
 	for {
-		h.CurrentIdx = (h.CurrentIdx - 1 + len(h.Records)) % len(h.Records)
+		h.CurrentIdx = (h.CurrentIdx + 1) % len(h.Records)
 		if !h.Records[h.CurrentIdx].Hidden {
 			break
 		}
@@ -464,10 +467,10 @@ func bingToggleDislike() string {
 
 	if r.Hidden {
 		log.Printf("Bing 壁纸: 已隐藏 (date=%s)", r.Date)
-		// Advance to next visible
+		// Advance to next visible (newer = +1)
 		attempts := 0
 		for {
-			h.CurrentIdx = (h.CurrentIdx - 1 + len(h.Records)) % len(h.Records)
+			h.CurrentIdx = (h.CurrentIdx + 1) % len(h.Records)
 			if !h.Records[h.CurrentIdx].Hidden {
 				break
 			}
@@ -587,7 +590,7 @@ func bingWallpaperLoop() {
 			// Move to next (newer) image, skip hidden
 			attempts := 0
 			for {
-				h.CurrentIdx = (h.CurrentIdx - 1 + len(h.Records)) % len(h.Records)
+				h.CurrentIdx = (h.CurrentIdx + 1) % len(h.Records)
 				if !h.Records[h.CurrentIdx].Hidden {
 					break
 				}

web-ui/src/settings/components/WallpaperSection.vue

@@ -84,7 +84,7 @@
           <img v-if="bing.url" :src="bingThumb" class="w-16 h-10 object-cover rounded flex-shrink-0">
           <div class="min-w-0">
             <div class="text-xs font-medium text-[var(--text-muted)] truncate">{{ bing.copyright || 'Bing 每日壁纸' }}</div>
-            <div class="text-[10px] text-[var(--text-weak)]">{{ bing.idx > 0 ? `${bing.idx} / ${bing.total}` : '' }}</div>
+            <div class="text-[10px] text-[var(--text-weak)]">{{ bing.total > 0 ? `${bing.idx + 1} / ${bing.total}` : '' }}</div>
           </div>
         </div>
         <div class="flex gap-1 flex-shrink-0">