Append trailing space after typed paste paths

[andyhtran]

Summary

• After CopyCat types the pasted file path (local or remote), append a trailing space so the user can keep typing the next argument without hitting space themselves.
• For the local path the typed value has no spaces, so the only way this corrupts a command is pasting inside quotes — uncommon for this workflow.

Test plan

• just dev, copy an image, paste into a terminal — cursor lands one space past the path, ready for the next argument.
• Same flow with a remote (Tailscale) peer — ~/... path is followed by a space.
• Paste inside a quoted argument and confirm the trailing space behavior is acceptable.

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