SSH Dashboard 2.1.3

Fixes the macOS application menu: the app menu now says About SSH Dashboard and opens the app's own About window instead of Avalonia's default About panel.

Universal macOS 12+ DMG (Apple Silicon + Intel), ad-hoc signed. It is not notarized; see README for the one-time Open Anyway step and docs/APP-STORE.md for the Developer ID/notarization and App Store paths.

Also includes the 2.1.2 work: real PTY resize for SSH sessions, terminal copy/mouse/paste, backups browser, encrypted PuTTY unlock, hashed hosts and Include'd configs.