feat: add DSR response handling for nushell compatibility#82
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Implement Device Status Report (DSR) response handling to fix compatibility with shells like nushell that rely on cursor position queries. Changes: - Add ResponseHandler in WASM that processes DSR queries and queues responses - Support DSR 5 (operating status) returning \x1b[0n - Support DSR 6 (cursor position) returning \x1b[row;colR - Add ghostty_terminal_has_response() and ghostty_terminal_read_response() exports - Update Terminal.ts to emit responses via onData after writes When nushell sends \x1b[6n to query cursor position, the terminal now responds with the cursor coordinates, allowing nushell to continue initialization instead of hanging. Fixes #73
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Fixes #72