umputun / revdiff / 24013549295

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Add custom keybindings support (#31)

* feat: create keymap package with types, defaults, and action resolution

Add keymap/ package that defines Action constants for all ~30 mappable
actions, Keymap struct with Resolve/KeysFor/HelpSections methods, and
Default() constructor with all standard key bindings. Tests verify
bindings match bubbletea's actual KeyMsg.String() output.

* feat: add keybindings file parser with map/unmap support and key normalization

* feat: add keymap Dump method for writing effective bindings to writer

* feat: wire keymap into Model and CLI with --keys and --dump-keys flags

* feat: refactor handleKey and handleViewToggle to use keymap actions

* feat: refactor handleDiffNav to use keymap actions

* feat: refactor handleTreeNav and handleTOCNav to use keymap actions

* feat: dynamic help overlay rendered from keymap bindings

* feat: acceptance tests verifying all keybinding criteria

* feat: update documentation for custom keybindings

* fix: address Copilot review findings

Update docs to reflect that help toggle is remappable via ActionHelp,
fix N key description in README, improve parse warning log message.

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