Implement SmartCopy action for seamless copy and interrupt handling

[GoodbyeNJN]

#4368

[Copilot]

Pull Request Overview

This PR implements a new SmartCopy action that provides seamless copy functionality with intelligent key handling. The action copies selected text when a selection exists, otherwise passes the key through to the terminal as a regular interrupt signal.

• Adds SmartCopy action variant to the Action enum and corresponding error context
• Implements routing logic that checks for text selection before deciding whether to copy or pass through the key
• Updates KDL parsing and protocol conversion to support the new action type

Reviewed Changes

Copilot reviewed 14 out of 14 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
zellij-utils/src/input/actions.rs	Adds SmartCopy variant to the Action enum
zellij-utils/src/errors.rs	Adds SmartCopy to the ScreenContext enum for error handling
zellij-utils/src/kdl/mod.rs	Adds KDL parsing support for "SmartCopy" action
zellij-utils/src/plugin_api/action.rs	Adds SmartCopy to unsupported protobuf actions list
zellij-server/src/route.rs	Implements routing logic and adds key context parameters
zellij-server/src/screen.rs	Adds SmartCopy screen instruction and processing logic
zellij-server/src/tab/mod.rs	Adds selection checking and reset methods to Tab
zellij-server/src/panes/	Implements has_selection method for different pane types
example/	Updates example configurations with commented SmartCopy keybinding examples

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