Adds conf.d/tricks.fish (PATH additions for ~/.local/bin and depot_tools,
bang-bang key bindings, history timestamp override, backup utility) and
functions/copy.fish (smarter cp wrapper that strips trailing slashes from
source directories, fixing a CachyOS-specific cp quirk).
Updates config.fish to explicitly source copy.fish on startup and refactors
several conditional blocks to single-line style for consistency. Syncs
README.md to document all new utilities.
rootiest
