XTGETTCAP terminal capability query support

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XTGETTCAP terminal capability query support (DCS sequences with hex-encoded capability names, responses for terminal name, columns, lines, and clipboard support).

Closes #4320, #2637 and #3951

[Copilot]

Pull Request Overview

This PR implements XTGETTCAP terminal capability query support, allowing Zellij to respond to DCS (Device Control String) sequences with hex-encoded capability names. The implementation adds support for querying terminal name, columns, lines, and clipboard support capabilities.

Key changes include:

• Added a new enable_xtgettcap configuration option across the codebase
• Implemented DCS query parsing and response generation in the Grid implementation
• Added test coverage for XTGETTCAP queries including terminal name, columns, and clipboard capabilities

Reviewed Changes

Copilot reviewed 19 out of 19 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
zellij-utils/src/kdl/mod.rs	Added parsing for enable_xtgettcap configuration option from KDL
zellij-utils/src/input/options.rs	Added enable_xtgettcap field to Options struct with CLI and merge support
zellij-utils/src/client_server_contract/common_types.proto	Added enable_xtgettcap field to protobuf Options message
zellij-utils/assets/prost_ipc/client_server_contract.rs	Generated protobuf code for new enable_xtgettcap field
zellij-utils/src/ipc/protobuf_conversion.rs	Added protobuf conversion for enable_xtgettcap option
zellij-utils/src/ipc/tests/roundtrip_tests.rs	Updated test to include enable_xtgettcap field
zellij-server/src/screen.rs	Threaded enable_xtgettcap parameter through Screen initialization
zellij-server/src/tab/mod.rs	Threaded enable_xtgettcap parameter through Tab and pane creation
zellij-server/src/tab/layout_applier.rs	Threaded enable_xtgettcap parameter through LayoutApplier
zellij-server/src/panes/terminal_pane.rs	Added enable_xtgettcap parameter to TerminalPane constructor
zellij-server/src/panes/plugin_pane.rs	Added enable_xtgettcap parameter to PluginPane constructor
zellij-server/src/panes/grid.rs	Implemented XTGETTCAP and DECRQSS query handling with DCS buffer management
zellij-server/src/panes/unit/grid_tests.rs	Added comprehensive tests for XTGETTCAP functionality
Multiple test files	Updated test constructors to pass false for enable_xtgettcap parameter

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[Copilot]

Pull Request Overview

Copilot reviewed 19 out of 19 changed files in this pull request and generated 2 comments.

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