Add Note Width setting to cap editor content width (#137)

src-tauri/src/commands.rs

@@ -122,6 +122,14 @@ pub fn set_ui_scale(state: State<'_, AppState>, scale: f64) -> Result<(), String
     Ok(())
 }
 
+#[tauri::command]
+pub fn set_content_width(state: State<'_, AppState>, width: Option<u32>) -> Result<(), String> {
+    let mut config = state.config.lock().map_err(|e| e.to_string())?;
+    config.content_width = width;
+    save_app_config(&config)?;
+    Ok(())
+}
+
 // ── Notebooks ──
 
 #[tauri::command]

src-tauri/src/lib.rs

@@ -106,6 +106,7 @@ pub fn run() {
             commands::set_font_family,
             commands::set_line_height,
             commands::set_ui_scale,
+            commands::set_content_width,
             commands::get_notebooks,
             commands::count_root_notes,
             commands::create_notebook,

src-tauri/src/types.rs

@@ -72,6 +72,8 @@ pub struct AppConfig {
     #[serde(default)]
     pub ui_scale: Option<f64>,
     #[serde(default)]
+    pub content_width: Option<u32>,
+    #[serde(default)]
     pub compact_notes: bool,
     #[serde(default = "default_true")]
     pub show_note_dates: bool,
@@ -205,6 +207,7 @@ impl Default for AppConfig {
             font_family: None,
             line_height: None,
             ui_scale: None,
+            content_width: None,
             compact_notes: false,
             show_note_dates: true,
             time_format: "relative".to_string(),