release: 0.50.0 — R1 quick-win sweep
Ships R1 (S1 backend safety, S2 frontend interaction, S3 i18n/a11y) plus the code-review follow-ups (filename byte-cap, demo deep_requested guard, release-notes highlight fallback). Mixed epic, so a real user-facing note: download-overwrite + long-title fixes, Escape layering, Plex light-theme menus, toast timer, unsubscribe error, modal-close i18n, toast aria-live; keyboard + hardening under chores.
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