docs: warn that the config task's tilde paths must be typed absolute

The paths are written with a tilde because this file is committed and the
repo forbids home paths in committed files. But neither Hyprland's
exec_cmd nor waybar's exec goes through a shell, so a tilde there never
expands and fails silently, which reads as a broken keybind rather than a
bad path. The two rules genuinely conflict here, so the plan now says
which form goes where instead of shipping lines that would not run.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01We9zcHEH8ZWHPcQwMaJRNv

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