fix(styling): fullscreen kraft paper bg, persistence preset refresh, reader cleanup

.cargo/config.toml

@@ -1,2 +1,6 @@
 [target.x86_64-pc-windows-gnu]
 rustflags = ["-C", "target-feature=+crt-static"]
+linker = "x86_64-w64-mingw32-gcc"
+
+[env]
+CARGO_TARGET_X86_64_PC_WINDOWS_GNU_LINKER = "x86_64-w64-mingw32-gcc"

src/app.rs

@@ -178,6 +178,26 @@ impl App {
 
 impl eframe::App for App {
     fn update(&mut self, ctx: &egui::Context, _frame: &mut eframe::Frame) {
+        let use_kraft = self.settings.use_kraft_bg;
+
+        // 牛皮纸模式：全窗口绘制纹理 + 面板透明
+        if use_kraft {
+            if let Some(texture) = &self.kraft_texture {
+                ctx.style_mut(|s| {
+                    s.visuals.panel_fill = egui::Color32::TRANSPARENT;
+                    s.visuals.window_fill = egui::Color32::TRANSPARENT;
+                    s.visuals.faint_bg_color = egui::Color32::TRANSPARENT;
+                });
+                let viewport_rect =
+                    ctx.input(|i| i.screen_rect());
+                crate::texture::draw_tiled_bg(
+                    &ctx.layer_painter(egui::LayerId::background()),
+                    viewport_rect,
+                    texture,
+                );
+            }
+        }
+
         if self.state.book.is_none() {
             self.welcome_view(ctx);
             return;
@@ -190,7 +210,6 @@ impl eframe::App for App {
 
         let mut style = self.active_profile().clone();
         let theme_copy = self.settings.theme;
-        let use_kraft = self.settings.use_kraft_bg;
         let profile_names: Vec<String> = self.settings.profiles.iter().map(|p| p.name.clone()).collect();
 
         egui::CentralPanel::default().show(ctx, |ui| {
@@ -203,9 +222,8 @@ impl eframe::App for App {
                  &mut self.state.sidebar_open,
                  &mut style,
                  &theme_copy,
-                &file_path,
-                self.kraft_texture.as_ref(),
                  use_kraft,
+                 &file_path,
                  &profile_names,
              );
 

src/persistence.rs

@@ -25,8 +25,20 @@ pub fn load_settings(dir: &Path) -> Result<Settings, String> {
     let path = dir.join(SETTINGS_FILE);
     let json = std::fs::read_to_string(&path)
         .map_err(|e| format!("读取设置失败: {}", e))?;
-    serde_json::from_str(&json)
+    let mut settings: Settings = serde_json::from_str(&json)
-        .map_err(|e| format!("解析设置失败: {}", e))
+        .map_err(|e| format!("解析设置失败: {}", e))?;
+    // Always refresh profiles from code-defined presets so that updated
+    // preset values (font size, spacing, etc.) take effect even when
+    // an older settings.json is present on disk.
+    let preset_names: Vec<String> = crate::style::StyleProfile::presets()
+        .iter()
+        .map(|p| p.name.clone())
+        .collect();
+    settings.profiles = crate::style::StyleProfile::presets();
+    if !preset_names.contains(&settings.active_profile) {
+        settings.active_profile = "Kindle 默认".into();
+    }
+    Ok(settings)
 }
 
 #[cfg(test)]

src/reader.rs

@@ -39,9 +39,8 @@ pub fn reading_view(
     sidebar_open: &mut bool,
     style: &mut StyleProfile,
     theme: &Theme,
-    _file_path: &str,
-    kraft_texture: Option<&egui::TextureHandle>,
     use_kraft_bg: bool,
+    _file_path: &str,
     profile_names: &[String],
 ) -> ReaderAction {
     let mut action = ReaderAction {
@@ -185,13 +184,6 @@ pub fn reading_view(
          let available = ui.available_size();
          let (rect, response) = ui.allocate_at_least(available, egui::Sense::click());
 
-        // Draw kraft paper background if enabled
-        if use_kraft_bg {
-            if let Some(tex) = kraft_texture {
-                crate::texture::draw_tiled_bg(ui.painter(), rect, tex);
-            }
-        }
-
          // Add reading margins (inset)
         let inset = 24.0;
         let text_rect = egui::Rect::from_min_size(