feat(ipc): expose monospace settings through preload bridge

- Add 'get-monospace-settings' + 'set-monospace-settings' to allowlist
- Expose electronAPI.monospace.{getSettings,saveSettings}
- Extend ElectronAPI TypeScript interface with the monospace namespace

src/preload.js

@@ -149,6 +149,10 @@ const ALLOWED_SEND_CHANNELS = [
   'crash:open-dir',
   'crash:delete',
 
+  // Monospace font settings
+  'get-monospace-settings',
+  'set-monospace-settings',
+
   // Git diff
   'git-diff',
 
@@ -496,6 +500,11 @@ contextBridge.exposeInMainWorld('electronAPI', {
     openDir: () => ipcRenderer.send('crash:open-dir'),
     delete: (filename) => ipcRenderer.invoke('crash:delete', filename),
   },
+
+  monospace: {
+    getSettings: () => ipcRenderer.invoke('get-monospace-settings'),
+    saveSettings: (partial) => ipcRenderer.invoke('set-monospace-settings', partial),
+  },
 });
 
 // Log successful preload initialization

src/renderer/types/electron.d.ts

@@ -128,6 +128,20 @@ export interface ElectronAPI {
     openDir: () => void;
     delete: (filename: string) => Promise<unknown>;
   };
+
+  monospace: {
+    getSettings: () => Promise<{
+      monospaceFont: 'jetbrains-mono' | 'fira-code';
+      monospaceLigatures: boolean;
+    }>;
+    saveSettings: (partial: {
+      monospaceFont?: 'jetbrains-mono' | 'fira-code';
+      monospaceLigatures?: boolean;
+    }) => Promise<{
+      monospaceFont: 'jetbrains-mono' | 'fira-code';
+      monospaceLigatures: boolean;
+    }>;
+  };
 }
 
 declare global {