terminal is fixed and im not happy about it

src/terminal.rs

@@ -186,6 +186,15 @@ impl Default for ColorPalette {
 }
 
 impl ColorPalette {
+    /// Return whether this palette is considered "light" based on default background luminance.
+    pub fn is_light(&self) -> bool {
+        let [r, g, b] = self.default_bg;
+        // Standard perceived luminance calculation
+        let luminance =
+            0.299 * (r as f32) + 0.587 * (g as f32) + 0.114 * (b as f32);
+        luminance > 128.0
+    }
+
     /// Parse a color specification like "#RRGGBB" or "rgb:RR/GG/BB".
     pub fn parse_color_spec(spec: &str) -> Option<[u8; 3]> {
         let spec = spec.trim();