feat(fonts): add JetBrainsMono Nerd Font Mono support and update font configurations (#257)

- Introduced JetBrainsMono Nerd Font Mono as a new font option in the application.
- Updated CSS to include font-face definitions for both regular and bold styles.
- Modified various components and utility files to set JetBrainsMono Nerd Font Mono as the default terminal font.
- Enhanced font handling logic to accommodate legacy font configurations.

src-tauri/src/utils/fonts.rs

@@ -2,7 +2,8 @@ use font_kit::font::Font;
 use font_kit::source::SystemSource;
 use serde::Serialize;
 
-pub const DEFAULT_TERMINAL_FONT_FAMILY: &str = "\"JetBrains Mono\", \"Cascadia Mono\", \"SF Mono\", Menlo, Monaco, Consolas, \"Liberation Mono\", monospace";
+pub const DEFAULT_TERMINAL_FONT_FAMILY: &str = "\"JetBrainsMono Nerd Font Mono\", \"JetBrains Mono\", \"Cascadia Mono\", \"SF Mono\", Menlo, Monaco, Consolas, \"Liberation Mono\", monospace";
+const LEGACY_DEFAULT_TERMINAL_FONT_FAMILY: &str = "\"JetBrains Mono\", \"Cascadia Mono\", \"SF Mono\", Menlo, Monaco, Consolas, \"Liberation Mono\", monospace";
 
 #[cfg(target_os = "macos")]
 pub const DEFAULT_UI_FONT_FAMILY: &str = "system-ui, -apple-system, BlinkMacSystemFont, \"PingFang SC\", \"Helvetica Neue\", Arial, sans-serif";
@@ -15,7 +16,7 @@ pub const DEFAULT_UI_FONT_FAMILY: &str =
 pub const DEFAULT_UI_FONT_FAMILY: &str =
     "system-ui, \"Noto Sans SC\", \"Noto Sans CJK SC\", \"Helvetica Neue\", Arial, sans-serif";
 
-const BUILT_IN_MONOSPACE_FONTS: &[&str] = &["JetBrains Mono"];
+const BUILT_IN_MONOSPACE_FONTS: &[&str] = &["JetBrainsMono Nerd Font Mono", "JetBrains Mono"];
 const GENERIC_MONOSPACE_FAMILY: &str = "monospace";
 
 #[derive(Debug, Clone, Serialize)]
@@ -52,6 +53,14 @@ pub fn list_system_font_families() -> Vec<String> {
 }
 
 pub fn normalize_terminal_font_family(font_family: &str) -> String {
+    if is_default_terminal_font_family(font_family) {
+        return DEFAULT_TERMINAL_FONT_FAMILY.to_string();
+    }
+
+    if is_legacy_default_terminal_font_family(font_family) {
+        return DEFAULT_TERMINAL_FONT_FAMILY.to_string();
+    }
+
     let source = SystemSource::new();
     let mut kept = Vec::new();
 
@@ -82,6 +91,18 @@ fn is_built_in_monospace_family(family: &str) -> bool {
         .any(|known| known.eq_ignore_ascii_case(family))
 }
 
+fn is_default_terminal_font_family(font_family: &str) -> bool {
+    font_family
+        .trim()
+        .eq_ignore_ascii_case(DEFAULT_TERMINAL_FONT_FAMILY)
+}
+
+fn is_legacy_default_terminal_font_family(font_family: &str) -> bool {
+    font_family
+        .trim()
+        .eq_ignore_ascii_case(LEGACY_DEFAULT_TERMINAL_FONT_FAMILY)
+}
+
 fn is_generic_monospace_family(family: &str) -> bool {
     family.eq_ignore_ascii_case(GENERIC_MONOSPACE_FAMILY)
 }
@@ -200,7 +221,10 @@ fn push_unique_font_family(families: &mut Vec<String>, family: String) {
 
 #[cfg(test)]
 mod tests {
-    use super::{split_font_family_stack, unquote_font_family};
+    use super::{
+        DEFAULT_TERMINAL_FONT_FAMILY, normalize_terminal_font_family, split_font_family_stack,
+        unquote_font_family,
+    };
 
     #[test]
     fn splits_font_stack_without_splitting_inside_quotes() {
@@ -215,4 +239,30 @@ mod tests {
         assert_eq!(unquote_font_family("\"Cascadia Mono\""), "Cascadia Mono");
         assert_eq!(unquote_font_family("'JetBrains Mono'"), "JetBrains Mono");
     }
+
+    #[test]
+    fn normalizes_legacy_default_to_nerd_font_default() {
+        assert_eq!(
+            normalize_terminal_font_family(
+                "\"JetBrains Mono\", \"Cascadia Mono\", \"SF Mono\", Menlo, Monaco, Consolas, \"Liberation Mono\", monospace"
+            ),
+            DEFAULT_TERMINAL_FONT_FAMILY
+        );
+    }
+
+    #[test]
+    fn keeps_current_default_terminal_font_stack() {
+        assert_eq!(
+            normalize_terminal_font_family(DEFAULT_TERMINAL_FONT_FAMILY),
+            DEFAULT_TERMINAL_FONT_FAMILY
+        );
+    }
+
+    #[test]
+    fn keeps_custom_jetbrains_mono_stack_without_forcing_nerd_font() {
+        assert_eq!(
+            normalize_terminal_font_family("\"JetBrains Mono\", monospace"),
+            "\"JetBrains Mono\", monospace"
+        );
+    }
 }

src/components/settings/AppearanceTab.tsx

@@ -49,6 +49,7 @@ interface FontInfo {
 }
 
 const PACKAGE_FONT_INFOS: FontInfo[] = [
+  { family: "JetBrainsMono Nerd Font Mono", monospace: true },
   { family: "JetBrains Mono", monospace: true },
   { family: "Noto Sans SC Variable", monospace: false },
   { family: "Inter", monospace: false },
@@ -78,7 +79,7 @@ const SYSTEM_UI_FONT_OPTIONS = [
   "monospace",
 ];
 const UI_FALLBACK_FONT = "Inter";
-const TERMINAL_FALLBACK_FONT = "JetBrains Mono";
+const TERMINAL_FALLBACK_FONT = "JetBrainsMono Nerd Font Mono";
 const GENERIC_FONT_FAMILIES = new Set([
   "serif",
   "sans-serif",

src/index.css

@@ -1,6 +1,22 @@
 @import "tailwindcss";
 @import "tw-animate-css";
 
+@font-face {
+  font-family: "JetBrainsMono Nerd Font Mono";
+  src: url("/fonts/JetBrainsMonoNerdFontMono-Regular.ttf") format("truetype");
+  font-weight: 400;
+  font-style: normal;
+  font-display: block;
+}
+
+@font-face {
+  font-family: "JetBrainsMono Nerd Font Mono";
+  src: url("/fonts/JetBrainsMonoNerdFontMono-Bold.ttf") format("truetype");
+  font-weight: 700;
+  font-style: normal;
+  font-display: block;
+}
+
 @custom-variant dark (&:is(.dark *));
 
 @theme {
@@ -11,8 +27,8 @@
     system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
     "Microsoft YaHei", "Noto Sans SC", "Noto Sans CJK SC", "Helvetica Neue", Arial, sans-serif;
   --font-mono:
-    "JetBrains Mono", "Cascadia Mono", "SF Mono", Menlo, Monaco, Consolas, "Liberation Mono",
-    monospace;
+    "JetBrainsMono Nerd Font Mono", "JetBrains Mono", "Cascadia Mono", "SF Mono", Menlo, Monaco,
+    Consolas, "Liberation Mono", monospace;
 
   --color-primary: var(--df-primary);
   --color-primary-hover: var(--df-primary-hover);

src/lib/defaultFonts.ts

@@ -1,7 +1,7 @@
 import { isMacOS, isWindows } from "./platform";
 
 export const DEFAULT_TERMINAL_FONT_FAMILY =
-  '"JetBrains Mono", "Cascadia Mono", "SF Mono", Menlo, Monaco, Consolas, "Liberation Mono", monospace';
+  '"JetBrainsMono Nerd Font Mono", "JetBrains Mono", "Cascadia Mono", "SF Mono", Menlo, Monaco, Consolas, "Liberation Mono", monospace';
 
 export function getDefaultUiFontFamily() {
   if (isMacOS) {