Add arca extension

extensions/arca/.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

extensions/arca/.prettierrc

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

extensions/arca/CHANGELOG.md

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+# Arca Changelog
+
+## [Initial Version] - {PR_MERGE_DATE}
+
+Initial release of the Arca Raycast extension, allowing users to manage their Arca tasks directly from Raycast.

extensions/arca/README.md

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+# Arca
+
+Manage your Arca tasks without leaving Raycast. Create tasks, review everything assigned to you, and see what's coming up, all from the command bar.
+
+## Commands
+
+- **Create Task**: Fill a quick form to create a task in any workspace and list, with status, priority, assignees, start date, and due date.
+- **My Tasks**: See all tasks assigned to you across every workspace, grouped by priority. Filter by workspace or toggle completed tasks on and off.
+- **Planned Tasks**: See tasks that have a due or start date, grouped into Overdue, Today, Tomorrow, and upcoming dates. Filter by workspace.
+
+## Setup
+
+This extension requires an **Arca API key**.
+
+1. Open the [Arca web app](https://web.getarca.app) or the desktop app.
+2. Go to **Settings → API**.
+3. Generate a new API key and copy it.
+4. Open Raycast, run any Arca command, and paste the key into the **Arca API key** preference field.
+
+## Preferences
+
+| Preference               | Description                                                                                               |
+| ------------------------ | --------------------------------------------------------------------------------------------------------- |
+| **Arca API key**         | Required. Your personal API key for authenticating with the Arca API.                                     |
+| **Show Completed Tasks** | When enabled, completed and cancelled tasks are shown in My Tasks and Planned Tasks. Disabled by default. |

extensions/arca/eslint.config.js

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