feat: 图片支持横向滚动显示所有+点击放大全屏

- 去掉3张限制，HorizontalScrollView 横向滚动展示所有图片
- 缩略图 80dp 正方形，超出可滑动查看
- 点击缩略图全屏放大查看（FIT_CENTER），点击关闭

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

app/src/main/java/com/xiaoqu/watch/ui/task/TaskListFragment.kt

@@ -260,7 +260,7 @@ class TaskListFragment : BaseFragment<FragmentTaskListBinding>() {
         binding.tvPosition.visibility = View.GONE
         binding.tvTimeInfo.visibility = View.GONE
         binding.tvPoints.visibility = View.GONE
-        binding.picContainer.visibility = View.GONE
+        binding.picScrollView.visibility = View.GONE
         binding.picContainer.removeAllViews()
         binding.tvNote.visibility = View.GONE
         binding.btnVoice.visibility = View.GONE
@@ -413,38 +413,64 @@ class TaskListFragment : BaseFragment<FragmentTaskListBinding>() {
      * 显示图片缩略图（用户上报任务 taskType=3/4 可能有图片附件）
      * 横排展示，最多3张，点击查看大图
      */
+    /**
+     * 显示图片缩略图（用户上报任务可能有图片附件）
+     * 横向滚动展示所有图片，点击放大全屏查看
+     */
     private fun showPictures(detail: TaskDetail) {
         if (!detail.hasPictures) return
 
         val pics = detail.uploadPic!!.filter { it.url.isNotEmpty() }
         if (pics.isEmpty()) return
 
-        binding.picContainer.visibility = View.VISIBLE
+        binding.picScrollView.visibility = View.VISIBLE
         binding.picContainer.removeAllViews()
 
-        // 计算每张图片尺寸：容器宽度 / 最多3列，留 gap
-        val maxCount = minOf(pics.size, 3)
-        val gap = 8  // dp
-        val containerWidth = resources.displayMetrics.widthPixels -
-            (21 * 2 * resources.displayMetrics.density).toInt()  // 减去 safe area padding
-        val imgSize = (containerWidth - gap * (maxCount - 1) *
-            resources.displayMetrics.density.toInt()) / maxCount
+        val density = resources.displayMetrics.density
+        val imgSize = (80 * density).toInt()  // 每张 80dp 正方形
+        val gap = (8 * density).toInt()
 
-        for ((index, pic) in pics.take(3).withIndex()) {
+        for ((index, pic) in pics.withIndex()) {
             val imageView = android.widget.ImageView(requireContext()).apply {
                 layoutParams = android.widget.LinearLayout.LayoutParams(imgSize, imgSize).apply {
-                    if (index > 0) marginStart = (gap * resources.displayMetrics.density).toInt()
+                    if (index > 0) marginStart = gap
                 }
                 scaleType = android.widget.ImageView.ScaleType.CENTER_CROP
                 setBackgroundColor(requireContext().getColor(R.color.card_background))
             }
-            // 用 HTTP 加载图片（和语音一样的 TLS 问题）
             val httpUrl = pic.url.replace("https://", "http://")
             loadImage(imageView, httpUrl)
+            // 点击放大全屏查看
+            imageView.setOnClickListener { showFullImage(httpUrl) }
             binding.picContainer.addView(imageView)
         }
     }
 
+    /** 全屏显示大图（覆盖在当前页面上，点击关闭） */
+    private fun showFullImage(url: String) {
+        val container = requireActivity().findViewById<FrameLayout>(R.id.dialog_container)
+        val overlay = FrameLayout(requireContext()).apply {
+            setBackgroundColor(0xE0000000.toInt())  // 半透明黑
+            isClickable = true
+        }
+        val imageView = android.widget.ImageView(requireContext()).apply {
+            layoutParams = FrameLayout.LayoutParams(
+                FrameLayout.LayoutParams.MATCH_PARENT,
+                FrameLayout.LayoutParams.MATCH_PARENT
+            )
+            scaleType = android.widget.ImageView.ScaleType.FIT_CENTER
+            setPadding(0, 0, 0, 0)
+        }
+        overlay.addView(imageView)
+        // 点击关闭
+        overlay.setOnClickListener {
+            container.removeView(overlay)
+        }
+        container.addView(overlay)
+        // 加载大图
+        loadImage(imageView, url)
+    }
+
     /** 异步加载图片到 ImageView */
     private fun loadImage(imageView: android.widget.ImageView, url: String) {
         viewLifecycleOwner.lifecycleScope.launch {