v0.5.1

Fix: web popup flicker in non-tmux terminals

• web no longer flickers/loops outside Ghostty. The saved-links and
  web dev popups redrew the whole screen every tick — invisible inside a tmux
  popup, but a constant full-screen flash in plain terminals (VS Code, Apple
  Terminal, any non-tmux zsh). The TUI now repaints only on keypress or resize,
  matching the cheat sheet. Search, navigation, add/edit/delete, and quit are
  unchanged.