fix: 重构拼图界面布局，使用权重布局确保底部按钮始终可见

- 将内容区域包装在可滚动的Column中
- 使用weight(1f)让内容区域占据剩余空间
- 底部按钮固定在屏幕底部
- 保持内容输入框高度为200dp以显示5行文字

app/build/intermediates/incremental/packageDebug/tmp/debug/dex-renamer-state.txt

@@ -1,4 +1,4 @@
-#Fri Mar 06 23:51:37 CST 2026
+#Fri Mar 06 23:58:06 CST 2026
 path.4=14/classes.dex
 path.3=12/classes.dex
 path.2=10/classes.dex

app/build/kotlin/compileDebugKotlin/cacheable/caches-jvm/inputs/source-to-output.tab.values.s

@@ -1 +1 @@
-τ8ξ)ϊ*ψ'ί&θ%ή!ψω#ϋ#η#η#η#η#
+τ8ξ)ϊ*ψ'ί&θ%ή!ψω#ϋ#η#η#η#η#η#

app/build/kotlin/compileDebugKotlin/cacheable/caches-jvm/lookups/counters.tab

@@ -1,2 +1,2 @@
-45
+46
 0

app/build/kotlin/compileDebugKotlin/cacheable/caches-jvm/lookups/lookups.tab.values.s

@@ -1 +1 @@
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î×
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+ëXè¾
ú¹
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app/src/main/java/com/inspection/camera/ui/merge/MergeScreen.kt

@@ -15,6 +15,7 @@ import androidx.compose.foundation.layout.Spacer
 import androidx.compose.foundation.layout.aspectRatio
 import androidx.compose.foundation.layout.fillMaxSize
 import androidx.compose.foundation.layout.fillMaxWidth
+import androidx.compose.foundation.layout.fillMaxHeight
 import androidx.compose.foundation.layout.height
 import androidx.compose.foundation.layout.heightIn
 import androidx.compose.foundation.layout.padding
@@ -22,6 +23,8 @@ import androidx.compose.foundation.layout.size
 import androidx.compose.foundation.lazy.grid.GridCells
 import androidx.compose.foundation.lazy.grid.LazyVerticalGrid
 import androidx.compose.foundation.lazy.grid.itemsIndexed
+import androidx.compose.foundation.verticalScroll
+import androidx.compose.foundation.rememberScrollState
 import androidx.compose.foundation.shape.CircleShape
 import androidx.compose.foundation.shape.RoundedCornerShape
 import androidx.activity.compose.rememberLauncherForActivityResult
@@ -209,6 +212,12 @@ fun MergeScreen(
             modifier = Modifier
                 .fillMaxSize()
                 .padding(paddingValues)
+        ) {
+            // 可滚动的内容区域
+            Column(
+                modifier = Modifier
+                    .weight(1f)
+                    .verticalScroll(rememberScrollState())
             ) {
                 // 布局选择
                 Row(
@@ -378,8 +387,9 @@ fun MergeScreen(
                         maxLines = 5
                     )
                 }
+            }
 
-            // 底部按钮
+            // 底部按钮 - 固定在底部
             Row(
                 modifier = Modifier
                     .fillMaxWidth()