Add Interface Scale setting to zoom the whole app (80-200%)

src-tauri/src/types.rs

@@ -70,6 +70,8 @@ pub struct AppConfig {
     #[serde(default)]
     pub line_height: Option<f64>,
     #[serde(default)]
+    pub ui_scale: Option<f64>,
+    #[serde(default)]
     pub compact_notes: bool,
     #[serde(default)]
     pub time_format: String,
@@ -167,6 +169,7 @@ impl Default for AppConfig {
             font_size: None,
             font_family: None,
             line_height: None,
+            ui_scale: None,
             compact_notes: false,
             time_format: "relative".to_string(),
             gpu_acceleration: true,