Merge pull request #1 from ericgoodwin/feat/configurable-keybindings

fix: normalize Shift+letter keys for consistent keybinding matching

refactor: extract small pure functions for readability

feat: protect Ctrl+C as quit unless explicitly rebound

fix: review feedback — simplify hints, improve errors, tighten visibility

fix: parse_key case preservation, error handling, and deterministic hints

feat: dynamic keybinding hints and config override semantics

feat: add configurable keybindings via [keybindings] section in config.toml

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