refactor(api): migrate from custom axios rest/graphql client to official octokit sdk

.github/copilot-instructions.md

@@ -153,7 +153,7 @@ This project focuses on GitHub notification monitoring, not being a full GitHub
 ## Technology Stack Reference
 
 **Core Technologies:**
-- **Electron 37+**: Desktop app framework
+- **Electron 40+**: Desktop app framework
 - **React 19+**: UI library  
 - **TypeScript 5+**: Language
 - **pnpm 10+**: Package manager
@@ -166,7 +166,8 @@ This project focuses on GitHub notification monitoring, not being a full GitHub
 - **menubar**: System tray integration
 - **electron-updater**: Auto-update functionality
 - **@primer/react**: GitHub's React component library
+- **octokit**: HTTP client for GitHub API
+- **@primer/octicons-react**: GitHub icon library
 - **date-fns**: Date utilities
-- **axios**: HTTP client for GitHub API
 
 ALWAYS reference this information first before exploring the codebase or running commands to save time and avoid common pitfalls.

biome.json

@@ -18,6 +18,8 @@
               ":BLANK_LINE:",
               "@primer/**",
               ":BLANK_LINE:",
+              "@octokit/**",
+              ":BLANK_LINE:",
               ":PACKAGE:",
               ":BLANK_LINE:",
               ["**/__mocks__/**", "**/__helpers__/**"],

jest.config.ts

@@ -1,5 +1,33 @@
 import type { Config } from 'jest';
 
+const esmPackages = [
+  '@github/relative-time-element',
+  '@github/tab-container-element',
+  '@lit-labs/react',
+  '@octokit/app',
+  '@octokit/core',
+  '@octokit/endpoint',
+  '@octokit/oauth-authorization-url',
+  '@octokit/oauth-methods',
+  '@octokit/graphql',
+  '@octokit/plugin-paginate-graphql',
+  '@octokit/plugin-paginate-rest',
+  '@octokit/plugin-retry',
+  '@octokit/plugin-rest-endpoint-methods',
+  '@octokit/plugin-throttling',
+  '@octokit/request',
+  '@octokit/request-error',
+  '@primer/octicons-react',
+  '@primer/primitives',
+  '@primer/react',
+  'lit',
+  'universal-user-agent',
+];
+
+const escapeForRegExp = (s: string) => s.replace(/[.*+?^${}()|[\]\\]/g, '\\$&');
+
+const transformIgnorePattern = `node_modules/(?!(?:${esmPackages.map(escapeForRegExp).join('|')})/)`;
+
 const config: Config = {
   preset: 'ts-jest',
   globalSetup: '<rootDir>/src/renderer/__helpers__/jest.setup.env.ts',
@@ -13,17 +41,9 @@ const config: Config = {
     '^.+\\.(js|mjs)$': 'babel-jest',
   },
   // Allow transforming specific ESM packages in node_modules that ship untranspiled ESM.
-  // @primer/* libraries rely on lit and @lit-labs/react internally for some components.
-  // @octokit/* libraries rely on universal-user-agent internally.
-  // We also include GitHub web components that ship ESM-only builds.
-  transformIgnorePatterns: [
-    'node_modules/(?!(?:@primer/react|@primer/primitives|@primer/octicons-react|@lit-labs/react|lit|@github/relative-time-element|@github/tab-container-element|@octokit/oauth-methods|@octokit/oauth-authorization-url|@octokit/request|@octokit/request-error|@octokit/endpoint|universal-user-agent)/)',
-  ],
+  // Packages are listed above in `esmPackages` for easier maintenance.
+  transformIgnorePatterns: [transformIgnorePattern],
   moduleNameMapper: {
-    // Force CommonJS build for http adapter to be available.
-    // via https://github.com/axios/axios/issues/5101#issuecomment-1276572468
-    '^axios$': require.resolve('axios'),
-
     // GitHub Primer Design System - CSS in JS
     '\\.css$': 'identity-obj-proxy',
   },

package.json

@@ -87,14 +87,17 @@
     "@electron/notarize": "3.1.1",
     "@graphql-codegen/cli": "6.1.1",
     "@graphql-codegen/schema-ast": "5.0.0",
+    "@octokit/core": "7.0.6",
+    "@octokit/graphql": "9.0.3",
     "@octokit/oauth-methods": "6.0.2",
-    "@octokit/openapi-types": "27.0.0",
-    "@octokit/request": "10.0.7",
+    "@octokit/plugin-paginate-rest": "14.0.0",
+    "@octokit/plugin-rest-endpoint-methods": "17.0.0",
+    "@octokit/plugin-retry": "8.0.3",
+    "@octokit/request-error": "^7.1.0",
     "@octokit/types": "16.0.0",
     "@parcel/watcher": "2.5.4",
     "@primer/css": "22.1.0",
     "@primer/octicons-react": "19.21.2",
-    "@primer/primitives": "11.3.2",
     "@primer/react": "38.7.1",
     "@tailwindcss/postcss": "4.1.18",
     "@testing-library/jest-dom": "6.9.1",
@@ -106,7 +109,6 @@
     "@types/react-dom": "19.2.3",
     "@types/react-router-dom": "5.3.3",
     "@types/semver": "7.7.1",
-    "axios": "1.13.2",
     "babel-jest": "30.2.0",
     "clsx": "2.1.1",
     "concurrently": "9.2.1",
@@ -125,7 +127,6 @@
     "jest": "30.2.0",
     "jest-environment-jsdom": "30.2.0",
     "mini-css-extract-plugin": "2.10.0",
-    "nock": "13.5.6",
     "postcss": "8.5.6",
     "postcss-loader": "8.2.0",
     "rimraf": "6.1.2",