* feat(keybinds): redesign cheatsheet with category navigation, M3 styling, and click-to-execute
- Add category sidebar with Material Symbols icons and badge counts
- Move search field to top of sidebar with Ctrl+F shortcut
- Implement 2-column masonry layout for keybind items
- Deduplicate duplicate actions and stack multi-key combos vertically
- Collapse consecutive workspace keybindings (1-9) into range entries
- Add media & hardware icons for volume, mic, brightness, and PrtSc keycaps
- Preserve Niri window filter properties and distinguish same-app Alt-Tab binds
- Enable click-to-execute for keybind actions across supported compositors
* fix(keybinds): preserve niri action properties and disable execution on range rows
* fix(keybinds): convert niri action properties to CLI flags and disable IPC execution for window switcher binds
* fix(keybinds): pass skip-confirmation as boolean switch in niri executeAction
* fix(keybinds): handle niri spawn-sh actions in executeAction
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