feat(lact-profiles): add LACT profile switcher (#425)

Author: arduoi

extensions/lact-profiles/README.md

@@ -0,0 +1,25 @@
+# LACT Profiles for Vicinae
+
+Browse the profiles exposed by the [LACT](https://github.com/ilya-zlobintsev/LACT) CLI, see which one is active, and switch profiles from Vicinae. The extension also shows LACT's automatic profile-switching status and lets you enable or disable it.
+
+The extension icon is the official LACT application icon from `res/io.github.ilya_zlobintsev.LACT.png`, used under the LACT project's MIT licence; see [THIRD_PARTY_NOTICES.md](THIRD_PARTY_NOTICES.md).
+
+## Requirements
+
+- Linux and Vicinae
+- LACT v0.8.2 or later, with `lact` available on `PATH` ([releases](https://github.com/ilya-zlobintsev/LACT/releases))
+- The LACT daemon (`lactd`) running and accessible to the desktop user
+
+Selecting a profile through LACT's CLI disables automatic switching. Turning automatic switching off follows LACT's behaviour and selects `Default`. If enabling automatic switching has already moved the active profile to `Default` (for example, when no rule matches), disabling it leaves `Default` active; the extension does not restore the profile that was active before automatic switching was enabled.
+
+The extension runs as the logged-in user and does not invoke `sudo`. Follow LACT's installation and socket-permissions documentation if the CLI cannot reach the daemon.
+
+## Development
+
+```bash
+npm install
+npm test
+npm run typecheck
+npm run lint
+npm run build
+```

extensions/lact-profiles/THIRD_PARTY_NOTICES.md

@@ -0,0 +1,23 @@
+The LACT application icon in `assets/lact-icon.png` is from [ilya-zlobintsev/LACT](https://github.com/ilya-zlobintsev/LACT), copyright (c) 2023 Ilya Zlobintsev, and is used under the following MIT License:
+
+> MIT License
+>
+> Copyright (c) 2023 Ilya Zlobintsev
+>
+> Permission is hereby granted, free of charge, to any person obtaining a copy
+> of this software and associated documentation files (the "Software"), to deal
+> in the Software without restriction, including without limitation the rights
+> to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+> copies of the Software, and to permit persons to whom the Software is
+> furnished to do so, subject to the following conditions:
+>
+> The above copyright notice and this permission notice shall be included in all
+> copies or substantial portions of the Software.
+>
+> THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+> IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+> FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+> AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+> LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+> OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+> SOFTWARE.