fix: 前端 HIGH/MEDIUM — timer 清理 + 历史持久化 + Error Boundary + console 移除

core/src/render/png.rs

@@ -1,7 +1,7 @@
 use crate::qr::QrCode;
 use image::{ImageBuffer, Luma};
 
-pub fn render_png(qr: &QrCode, module_size: u8) -> Vec<u8> {
+pub fn render_png(qr: &QrCode, module_size: u8) -> Result<Vec<u8>, image::ImageError> {
     let matrix_size = qr.size() as u32;
     let margin = qr.margin as u32;
     let total_size = matrix_size + 2 * margin;
@@ -34,7 +34,6 @@ pub fn render_png(qr: &QrCode, module_size: u8) -> Vec<u8> {
     }
 
     let mut buf = Vec::new();
-    img.write_to(&mut std::io::Cursor::new(&mut buf), image::ImageFormat::Png)
-        .expect("PNG 编码失败");
-    buf
+    img.write_to(&mut std::io::Cursor::new(&mut buf), image::ImageFormat::Png)?;
+    Ok(buf)
 }