license: add GPL-3.0 headers and use GPL-3.0-only SPDX

Align with the canonical GPL-3.0 application steps from choosealicense.com:
- set package.json license to the non-deprecated SPDX identifier GPL-3.0-only
- add the standard FSF GPL-3.0 boilerplate notice (copyright + free-software
  header) to all authored source files (main, preload, renderer, shared,
  configs, tests); shadcn/ui components and lib/utils keep their MIT origin
- include the small HomeScreen formatting/reorder tweak left over from the
  ui-revamp session

Author: muhammadhasnainsaeed

docs/CHANGELOG.md

@@ -1452,8 +1452,14 @@ component split, and functional wiring (UI/design-system migration only).
   copyright notice (© 2026 Muhammad Hasnain Saeed). The full standard
   worldwide GPL-3.0 text (FSF) is used verbatim, including the terms and
   conditions (sections 0–17) and the "How to Apply These Terms" appendix.
-- Added `"license": "GPL-3.0"` (SPDX) to `package.json` (it previously had no
-  license field).
+- Added `"license": "GPL-3.0-only"` (non-deprecated SPDX identifier) to
+  `package.json` (it previously had no license field).
+- Added the standard FSF GPL-3.0 boilerplate notice (program name, copyright,
+  and the "free software" header per the license's "How to Apply These Terms"
+  section) to the top of every authored source file (main, preload, renderer,
+  shared types, configs, and tests). Excluded the third-party-derived shadcn/ui
+  components (`src/renderer/components/ui/*`) and `src/renderer/lib/utils.ts`,
+  which are MIT-licensed shadcn source and keep their own origin.
 - Updated README: license line in the docs/footer from "MIT License" to
   "GNU General Public License v3.0", and added a GPLv3 license badge under the
   title.

esbuild.config.js

@@ -1,3 +1,21 @@
+/*
+ * Urdu English Interpreter
+ * Copyright (C) 2026 Muhammad Hasnain Saeed
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 const esbuild = require('esbuild');
 const fs = require('fs');
 const path = require('path');

package.json

@@ -4,7 +4,7 @@
   "description": "Real-time Urdu-to-English voice interpreter for macOS meetings",
   "main": "dist/main/index.js",
   "private": true,
-  "license": "GPL-3.0",
+  "license": "GPL-3.0-only",
   "scripts": {
     "build": "node esbuild.config.js",
     "watch": "node esbuild.config.js --watch",

packages/shared/index.ts

@@ -1,3 +1,21 @@
+/*
+ * Urdu English Interpreter
+ * Copyright (C) 2026 Muhammad Hasnain Saeed
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 export interface TranslationResult {
   originalText: string;
   translatedText: string;

src/main/index.ts

@@ -1,3 +1,21 @@
+/*
+ * Urdu English Interpreter
+ * Copyright (C) 2026 Muhammad Hasnain Saeed
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 import * as dotenv from "dotenv";
 import { app, BrowserWindow, ipcMain } from "electron";
 import * as os from "os";

src/main/ipc/audio-output.ts

@@ -1,3 +1,21 @@
+/*
+ * Urdu English Interpreter
+ * Copyright (C) 2026 Muhammad Hasnain Saeed
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 import { ipcMain, BrowserWindow } from "electron";
 import { AudioOutputManager, detectBlackHole } from "../services/audio-output/manager";
 

src/main/ipc/audio.ts

@@ -1,3 +1,21 @@
+/*
+ * Urdu English Interpreter
+ * Copyright (C) 2026 Muhammad Hasnain Saeed
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 import { ipcMain } from "electron";
 import {
   getMicrophonePermission,

src/main/ipc/session.ts

@@ -1,3 +1,21 @@
+/*
+ * Urdu English Interpreter
+ * Copyright (C) 2026 Muhammad Hasnain Saeed
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 import { ipcMain, BrowserWindow } from "electron";
 import type { SessionEvent } from "@shared/index";
 import { sessionManager } from "../services/session";

src/main/ipc/stt.ts

@@ -1,3 +1,21 @@
+/*
+ * Urdu English Interpreter
+ * Copyright (C) 2026 Muhammad Hasnain Saeed
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 import { ipcMain, BrowserWindow } from "electron";
 import type { SttEvent } from "@shared/index";
 import { sttSession } from "../services/stt/manager";

src/main/ipc/system.ts

@@ -1,3 +1,21 @@
+/*
+ * Urdu English Interpreter
+ * Copyright (C) 2026 Muhammad Hasnain Saeed
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 import { ipcMain, shell } from "electron";
 import type { OpenExternalResult } from "@shared/index";
 import { isAllowedOpenExternalUrl } from "@shared/index";