fix: support application cursor mode (DECCKM) for arrow keys#81
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Arrow keys now correctly send SS3 sequences (ESC O A/B/C/D) when application cursor mode is enabled (DEC mode 1), and CSI sequences (ESC [ A/B/C/D) when in normal mode. This fixes arrow key navigation in applications like htop that enable application cursor mode. Changes: - Rewrote Key enum to match Ghostty's internal values (was using USB HID codes) - Arrow keys now go through the Ghostty encoder instead of fast path - Sync encoder CURSOR_KEY_APPLICATION option with terminal mode 1 state - Add getModeCallback to InputHandler for querying terminal mode state - Add tests for both normal and application cursor modes The Key enum change also fixes the encoder for all special keys (F-keys, navigation keys, etc.) which were previously producing incorrect or empty output due to the enum value mismatch.
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fixes #79