Add defaultmic extension

extensions/defaultmic/.gitignore

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+# See https://help.github.com/articles/ignoring-files/ for more about ignoring files.
+
+# dependencies
+/node_modules
+
+
+# Raycast specific files
+raycast-env.d.ts
+.raycast-swift-build
+.swiftpm
+compiled_raycast_swift
+compiled_raycast_rust
+
+# misc
+.DS_Store
+/.idea

extensions/defaultmic/.prettierrc

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+{
+  "printWidth": 120,
+  "singleQuote": false
+}

extensions/defaultmic/CHANGELOG.md

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+# DefaultMic Changelog
+
+## [Initial Version] - {PR_MERGE_DATE}
+
+- Added `Select Default Mic` command to list input devices and set the active system microphone.
+- Added `Toggle Mic Lock` command to enable or disable persistent microphone locking.
+- Added preferred microphone persistence via Raycast LocalStorage.
+- Added automatic sync of lock target when a new preferred microphone is selected.
+- Added background lock agent setup via LaunchAgent to keep the selected microphone active.
+- Added automatic installation of `switchaudio-osx` via Homebrew when `SwitchAudioSource` is missing.
+- Added clearer dependency error messages when Homebrew is unavailable or install fails.

extensions/defaultmic/README.md

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+# DefaultMic
+
+Raycast extension for macOS with 2 commands:
+
+- `Select Default Mic` - choose and set the default microphone from a list.
+- `Toggle Mic Lock` - turn lock on/off. When lock is ON, the extension keeps restoring the selected microphone even after connecting other audio devices.
+
+## Dependency handling
+
+The extension needs `SwitchAudioSource` and checks it every time commands are opened.
+
+If the binary is missing, the extension automatically installs `switchaudio-osx` via Homebrew.
+
+You can also run installation manually from the action panel using `Install SwitchAudioSource`.
+
+If Homebrew is missing or installation fails, the extension shows a clear error message with the next step.

extensions/defaultmic/eslint.config.js

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+const { defineConfig } = require("eslint/config");
+const raycastConfig = require("@raycast/eslint-config");
+
+module.exports = defineConfig([
+  ...raycastConfig,
+]);