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9b35c2bb65
Expose the internal mouse encoding functionality through the C API, following the same pattern as the existing key encoding API. This allows external consumers of libvt to encode mouse events into terminal escape sequences (X10, UTF-8, SGR, URxvt, SGR-Pixels). The API is split into two opaque handle types: GhosttyMouseEvent for building normalized mouse events (action, button, modifiers, position) and GhosttyMouseEncoder for converting those events into escape sequences. The encoder is configured via a setopt interface supporting tracking mode, output format, renderer geometry, button state, and optional motion deduplication by last cell. Encoder state can also be bulk-configured from a terminal handle via ghostty_mouse_encoder_setopt_from_terminal. Failed encodes due to insufficient buffer space report the required size without mutating deduplication state.