Fix: Get unit from config

- Use conditionals to determine the temperature unit symbol from config
- cargo clippy

widget/build.rs

@@ -1,3 +1,3 @@
 fn main() {
     slint_build::compile("ui/widget-popup.slint").unwrap();
-}
+}

widget/src/main.rs

@@ -1,8 +1,8 @@
 use owm_rs::free_api_v25::current::WeatherResponse;
 use owm_widg_config::config::Config;
 use owm_widg_config::general::ApiVersion;
-use std::fs;
 use slint::SharedString;
+use std::fs;
 
 slint::include_modules!();
 
@@ -30,21 +30,22 @@ fn main() -> Result<(), Box<dyn std::error::Error>> {
                 .sys
                 .as_ref()
                 .and_then(|s| s.country.clone())
-                .unwrap_or_else(|| "".into());
+                .unwrap_or_else(|| String::new());
 
             let (weather_main, weather_description, icon) = if let Some(w) = resp.weather.first() {
-                (
-                    w.main.clone(),
-                    w.description.clone(),
-                    w.icon.clone(),
-                )
+                (w.main.clone(), w.description.clone(), w.icon.clone())
             } else {
-                ("N/A".into(), "N/A".into(), "".into())
+                ("N/A".into(), "N/A".into(), String::new())
             };
 
             let temp = resp.main.as_ref().and_then(|m| m.temp).unwrap_or(0.0);
             let temperature = format!("{temp:.1}");
-            let unit = "C";
+            let unit = match cfg.query_params.units.as_str() {
+                "metric" => 'C',
+                "imperial" => 'F',
+                "standard" => 'K',
+                _ => '?',
+            };
 
             // Create and show the UI
             let ui = MainWindow::new()?;
@@ -67,8 +68,8 @@ fn main() -> Result<(), Box<dyn std::error::Error>> {
 /// Convert OWM icon codes (e.g. "01d", "09n") to Nerd Font weather glyphs.
 fn icon_to_nerd_font(code: &str) -> String {
     match code {
-        "01d" => "", // clear day
-        "01n" => "", // clear night
+        "01d" => "",         // clear day
+        "01n" => "",         // clear night
         "02d" | "02n" => "", // few clouds
         "03d" | "03n" => "", // scattered clouds
         "04d" | "04n" => "", // broken clouds
@@ -77,7 +78,7 @@ fn icon_to_nerd_font(code: &str) -> String {
         "11d" | "11n" => "", // thunderstorm
         "13d" | "13n" => "", // snow
         "50d" | "50n" => "", // mist
-        _ => "".into(),
+        _ => "",
     }
     .into()
 }