documents: dropped files and pasted pictures go to the owner; insert puts text at the caret

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

src/editor/mod.rs

@@ -48,7 +48,7 @@ pub use find::{FindOptions, FindWidget, find_all};
 pub use hints::{CompletionItem, CompletionMenu, Signature, SignatureHelp, completions};
 pub use hover::HoverInfo;
 pub use keybindings::{KeySource, Keybinding, KeybindingsEditor, conflicts};
-pub(crate) use keys::{Newline, bind_keys};
+pub(crate) use keys::{Newline, Paste, bind_keys};
 pub(crate) use layout::stack;
 pub use preview::ThemePreview;
 pub use problems::{Problem, ProblemsPanel};