Reliable terminal restore after hard refresh

What's Changed

• Replays deferred terminal renderer refreshes once xterm is open and visible, even when the presentation snapshot itself is unchanged.
• Prevents alternate-screen sessions such as btop from remaining blank after a hard browser refresh until another session is selected.
• Adds a regression test for the initial-selection-before-terminal-open race.

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