Drop the LEADER/HYPR prefixes and bind everything directly on SUPER.
Add media-key, brightness, window/layout and workspace bindings. Rename
the special workspace from 'special' to 'scratchpad' and update the
matching window/workspace rules. Map modmask 73 in the keybindings help
script.
Extract monitors, functions, rules, env vars, and onstart into
separate files. Add toggle_pin, toggle_master_scrolling, and
layout-aware keybinds for scrolling layout.
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