Add Clean Folders extension

extensions/clean-folders/.prettierrc

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

extensions/clean-folders/CHANGELOG.md

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+## [Initial Version] - {PR_MERGE_DATE}
+
+Added the Clean All and Clean Folder commands.

extensions/clean-folders/README.md

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+# Clean Folders
+
+Downloads pile up quickly, and screenshot-heavy workflows can flood the Desktop just as fast—especially when sharing screen context with AI chats. Clean Folders clears that clutter without permanently deleting anything.
+
+The extension provides two commands:
+
+- **Clean All** moves the contents of every configured folder to the Trash after one confirmation.
+- **Clean Folder** lets you pick one configured folder, then hands the cleanup to Clean All for confirmation and execution.
+
+Set **Folders** in the extension preferences to a comma-separated list of paths. A leading `~` is supported, and the default is `~/Downloads, ~/Desktop`. Empty entries and duplicate paths are ignored.
+
+Items only ever go to the macOS Trash, so they remain recoverable.

extensions/clean-folders/eslint.config.js

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