Align keybind recipe with guidance style and fix typos

[Copilot]

The keybind recipe was written prescriptively around a specific library/template rather than explaining approaches for configurable keybindings in Ratatui apps. It also contained numerous typos.

Changes:

• Style alignment: Rewrote introduction and content to focus on patterns and trade-offs rather than prescribing crossterm-keybind as the solution. Positioned template as optional extra.
• Typo fixes: Corrected 15+ spelling/grammar errors (comparing, customized, initialized, ahead, modern, migrated, etc.)
• Language improvements: Changed prescriptive language ("you should use", "the system uses") to guidance-oriented language ("you can", "one approach is")

The recipe now follows the established pattern: problem statement → design goals → core patterns → concrete implementation example → optional template.

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