Fix paste in inline session title editor

[edwin-zvs]

Summary

• route terminal paste events into the active inline session-title editor
• support Cmd-V, Ctrl-V, and Emacs Ctrl-Y through the existing local/SSH clipboard path
• keep pasted Unicode text cursor-safe and prevent it from leaking into the pane PTY

Testing

• cargo test -p construct-cli session_title_rename (8 passed)
• cargo build

Visuals

• Not included: this changes keyboard/clipboard input routing without a visual-state difference.