feat(monospace): add MonospaceFontConfig path resolver

Resolves dev vs packaged (asar.unpacked) TTF paths. Logs warn, returns null
when bundled font is missing.

tests/monospace-font-config.test.js

@@ -0,0 +1,45 @@
+jest.mock('electron', () => ({
+  app: { getPath: () => '/fake/userData' },
+}));
+jest.mock('fs', () => ({ existsSync: jest.fn(), statSync: jest.fn() }));
+
+const fs = require('fs');
+const MonospaceFontConfig = require('../src/main/MonospaceFontConfig');
+
+describe('MonospaceFontConfig', () => {
+  afterEach(() => { jest.clearAllMocks(); });
+
+  test('returns null when no file exists', () => {
+    fs.existsSync.mockReturnValue(false);
+    const p = MonospaceFontConfig.getMonoFontTtfPath('jetbrains-mono', 400);
+    expect(p).toBeNull();
+  });
+
+  test('returns dev repo path when dev file exists', () => {
+    fs.existsSync.mockImplementation((p) => !p.includes('app.asar.unpacked') && p.endsWith('JetBrainsMono-Regular.ttf'));
+    const p = MonospaceFontConfig.getMonoFontTtfPath('jetbrains-mono', 400);
+    expect(p).toMatch(/assets\/fonts\/JetBrainsMono-Regular\.ttf$/);
+  });
+
+  test('returns packaged asar.unpacked path when present and file exists', () => {
+    fs.existsSync.mockImplementation((p) => p.includes('app.asar.unpacked') && p.endsWith('FiraCode-Regular.ttf'));
+    const p = MonospaceFontConfig.getMonoFontTtfPath('fira-code', 400);
+    expect(p).toContain('app.asar.unpacked');
+    expect(p).toContain('FiraCode-Regular.ttf');
+  });
+
+  test('returns null and warns when file is missing', () => {
+    const warn = jest.spyOn(console, 'warn').mockImplementation(() => {});
+    fs.existsSync.mockReturnValue(false);
+    const p = MonospaceFontConfig.getMonoFontTtfPath('fira-code', 700);
+    expect(p).toBeNull();
+    expect(warn).toHaveBeenCalledWith(expect.stringMatching(/FiraCode-Bold\.ttf/));
+    warn.mockRestore();
+  });
+
+  test('ligaturesEnabled maps from settings', () => {
+    expect(MonospaceFontConfig.ligaturesEnabled({ monospaceLigatures: true })).toBe(true);
+    expect(MonospaceFontConfig.ligaturesEnabled({ monospaceLigatures: false })).toBe(false);
+    expect(MonospaceFontConfig.ligaturesEnabled({})).toBe(false);
+  });
+});