Freedom 0.6.2: Radicle in the browser

Freedom 0.6.2 brings experimental Radicle into the browser on macOS and Linux, and adds support for Swarm encrypted references.

New

Experimental Radicle (decentralized Git hosting) on macOS and Linux:
- Enable or disable it from Settings > Experimental
- rad:// URL handling across navigation and rewriting
- Bundled Radicle node lifecycle and packaging
- An integrated repo browser and a GitHub-to-Radicle import bridge
- Automatic seeding of Freedom's canonical Radicle repository when the bundled node runs
Swarm encrypted reference support in navigation and URL rewriting, including 64- and 128-character hex references

Cmd/Ctrl+L reliably focuses the address bar even when web content has focus
Cmd/Ctrl+L and Escape consistently close open menus and clear stale focus highlights
Pinned tabs can no longer be closed through keyboard-accelerator close-tab actions

Protocol-specific identifiers in IPC handlers and URL rewriting are validated to block malformed or malicious input