feat(zsh): rebuild PATH hash on every completion

`zstyle ':completion:*' rehash true` makes zle re-scan $PATH directories
on every TAB instead of caching the hash table at shell startup. Cost is
trivial (one stat() per PATH entry per completion), benefit is that newly
installed binaries — from paru, cargo install, pip install --user, npm
install -g, manual /usr/local/bin drops, anything — show up immediately
without an explicit `hash -r` or new shell.

The pacman-hook alternative at https://wiki.archlinux.org/title/Zsh#Persistent_rehash
only catches paru/pacman installs, missing cargo/pip/manual; rehash=true
catches them all for the same negligible cost.

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