feat(date-recorder): use camera and crop icons for record/crop buttons

- DateRecorder FAB: Icons.Filled.Add -> Icons.Filled.PhotoCamera
  (与 onOpenCamera / '拍照记录' 语义一致)
- PhotoEditor crop toggle: 纯文字 -> Icons.Filled.Crop / CropFree 图标
  (Crop 关闭态, CropFree 开启态, contentDescription 保留无障碍语义)

core/src/main/kotlin/plus/rua/project/ui/DateRecorderScreen.kt

@@ -17,12 +17,12 @@ import androidx.compose.foundation.lazy.grid.items
 import androidx.compose.foundation.shape.CircleShape
 import androidx.compose.foundation.shape.RoundedCornerShape
 import androidx.compose.material.icons.Icons
-import androidx.compose.material.icons.filled.Add
 import androidx.compose.material.icons.filled.Check
 import androidx.compose.material.icons.filled.Checklist
 import androidx.compose.material.icons.filled.ChevronLeft
 import androidx.compose.material.icons.filled.Close
 import androidx.compose.material.icons.filled.Delete
+import androidx.compose.material.icons.filled.PhotoCamera
 import androidx.compose.material.icons.filled.Sort
 import androidx.compose.material3.AlertDialog
 import androidx.compose.material3.BottomAppBar
@@ -202,7 +202,7 @@ fun DateRecorderScreen(
                     containerColor = MaterialTheme.colorScheme.primary,
                     contentColor = MaterialTheme.colorScheme.onPrimary
                 ) {
-                    Icon(Icons.Filled.Add, contentDescription = "拍照记录")
+                    Icon(Icons.Filled.PhotoCamera, contentDescription = "拍照记录")
                 }
             }
         },

core/src/main/kotlin/plus/rua/project/ui/PhotoEditorScreen.kt

@@ -20,6 +20,7 @@ import androidx.compose.material.icons.Icons
 import androidx.compose.material.icons.filled.Brush
 import androidx.compose.material.icons.filled.ChevronLeft
 import androidx.compose.material.icons.filled.Crop
+import androidx.compose.material.icons.filled.CropFree
 import androidx.compose.material.icons.filled.Done
 import androidx.compose.material.icons.filled.RotateLeft
 import androidx.compose.material.icons.filled.RotateRight
@@ -430,7 +431,10 @@ private fun ToolBar(
             }
             EditTab.CROP -> {
                 FilledIconButton(onClick = onCropToggle) {
-                    Text(if (state.cropEnabled) "关闭裁剪" else "开启裁剪")
+                    Icon(
+                        if (state.cropEnabled) Icons.Filled.CropFree else Icons.Filled.Crop,
+                        contentDescription = if (state.cropEnabled) "关闭裁剪" else "开启裁剪"
+                    )
                 }
             }
             EditTab.HANDWRITE -> {