PWA reconnect and mobile input focus

What's Changed

• Retry stalled foreground state and terminal connections after 15 seconds, and recover immediately when the browser reports the network is online.
• Preserve the focused terminal or composer input when opening the mobile tools menu, avoiding an unnecessary keyboard focus switch.

Release integrity

Native archives have matching platform-specific SPDX SBOM assets plus GitHub build-provenance and SBOM attestations. Installers and the built-in updater additionally verify a signed manifest and all packaged-file hashes.

Verification guide · Security policy