chore: publish prep — icons, privacy policy, version 1.0.0

- Generate real PNG icons (16/48/128px) with white O on dark background
- Add PRIVACY.md documenting no data collection, storage-only permissions

PRIVACY.md

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+# Outcut Privacy Policy
+
+Outcut is a browser extension that adds keyboard shortcuts to Outlook Web App.
+
+## Data Collection
+
+Outcut does **not** collect, transmit, or store any personal data.
+
+## Storage
+
+Outcut stores your preferences (keyboard shortcut preset selection and toggle states) using Chrome's built-in `chrome.storage.sync` API. This data:
+- Stays on your device and within your Chrome profile
+- Syncs across your Chrome instances if you use Chrome Sync (a Google feature, not ours)
+- Is never sent to any external server
+
+## Permissions
+
+- **storage**: Save your extension preferences locally
+- No other permissions are required
+
+## Email Content
+
+Outcut never reads, processes, stores, or transmits the content of your emails. It only interacts with the Outlook Web App's user interface elements (buttons, message list items) to provide keyboard shortcut functionality.
+
+## Contact
+
+For questions about this privacy policy, open an issue on the project's GitHub repository.
+
+*Last updated: April 2026*